# tree.test:  tests for the tree structure. -*- tcl -*-
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1998-2000 by Ajuba Solutions.
# Copyright (c) 2000-2008 by Andreas Kupries
# All rights reserved.
#
# RCS: @(#) $Id: tree.testsuite,v 1.9 2009/09/24 22:22:28 andreas_kupries Exp $

::tcltest::testConstraint tree_critcl [string equal $impl critcl]

############################################################
# I. Tree object construction and destruction ...
############################################################

test tree-${impl}-1.1 {tree errors} {
    tree mytree
    catch {tree mytree} msg
    mytree destroy
    set msg
} {command "::mytree" already exists, unable to create tree}

test tree-${impl}-1.2 {tree errors} {
    tree mytree
    catch {mytree} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY option ?arg arg ...?\""

test tree-${impl}-1.3 {tree errors} {
    tree mytree
    catch {mytree foo} msg
    mytree destroy
    set msg
} {bad option "foo": must be -->, =, ancestors, append, attr, children, cut, delete, depth, descendants, deserialize, destroy, exists, get, getall, height, index, insert, isleaf, keyexists, keys, lappend, leaves, move, next, nodes, numchildren, parent, previous, rename, rootname, serialize, set, size, splice, swap, unset, walk, or walkproc}

test tree-${impl}-1.4 {tree errors} {
    catch {tree set} msg
    set msg
} {command "::set" already exists, unable to create tree}

test tree-${impl}-1.5 {tree construction errors} {
    catch {tree mytree foo} msg
    set msg
} {wrong # args: should be "tree ?name ?=|:=|as|deserialize source??"}

test tree-${impl}-1.6 {tree construction errors} {
    catch {tree mytree foo far} msg
    set msg
} {wrong # args: should be "tree ?name ?=|:=|as|deserialize source??"}

# Copy constructor errors are tested as part of 'deserialize'.
# See 5.5.x at the bottom.

test tree-${impl}-1.7 {create} {
    tree mytree
    set result [string equal [info commands ::mytree] "::mytree"]
    mytree destroy
    set result
} 1
test tree-${impl}-1.8 {create} {
    set name [tree]
    set result [list \
		    [regexp {^::tree\d+$} $name] \
		    [string equal [info commands $name] "$name"]]
    $name destroy
    set result
} {1 1}

test tree-${impl}-1.9 {destroy} {
    tree mytree
    mytree destroy
    string equal [info commands ::mytree] ""
} 1

############################################################
# II. Node attributes ...
# - set, append, lappend
# - get, getall
# - unset
# - keys, keyexists
#
# All operations on the root node, there is no
# special case to think about.
############################################################

############################################################

test tree-${impl}-2.1.1 {set, wrong # args} {
    tree mytree
    catch {mytree set root data foo far} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY set node key ?value?\""

test tree-${impl}-2.1.2 {set gives error on bogus node} {
    tree mytree
    catch {mytree set snarf data} msg
    mytree destroy
    set msg
} "node \"snarf\" does not exist in tree \"$MY\""

test tree-${impl}-2.1.3 {set retrieves and/or sets value} {
    tree mytree
    mytree set             root baz foobar
    set result [mytree set root baz]
    mytree destroy
    set result
} foobar

test tree-${impl}-2.1.4 {set with bad key gives error} {
    tree mytree
    catch {mytree set root foo} msg
    mytree destroy
    set msg
} {invalid key "foo" for node "root"}

test tree-${impl}-2.1.5 {set with bad key gives error} {
    tree mytree
    mytree set root data ""
    catch {mytree set root foo} msg
    mytree destroy
    set msg
} {invalid key "foo" for node "root"}

############################################################

test tree-${impl}-2.2.1 {append with too many args gives error} {
    tree mytree
    catch {mytree append root foo bar baz boo} msg
    mytree destroy
    set msg
} [tmTooMany append {node key value}]

test tree-${impl}-2.2.2 {append gives error on bogus node} {
    tree mytree
    catch {mytree append {IT::EM 0} data foo} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.2.3 {append creates missing attribute} {
    tree mytree
    set     result [list]
    lappend result [mytree keyexists root data]
    lappend result [mytree append    root data bar]
    lappend result [mytree keyexists root data]
    lappend result [mytree get       root data]
    mytree destroy
    set result
} {0 bar 1 bar}

test tree-${impl}-2.2.4 {append appends to attribute value} {
    tree mytree
    set result [list]
    lappend result [mytree set    root data foo]
    lappend result [mytree append root data bar]
    lappend result [mytree get    root data]
    mytree destroy
    set result
} {foo foobar foobar}

############################################################

test tree-${impl}-2.3.1 {lappend with too many args gives error} {
    tree mytree
    catch {mytree lappend root foo bar baz boo} msg
    mytree destroy
    set msg
} [tmTooMany lappend {node key value}]

test tree-${impl}-2.3.2 {lappend gives error on bogus node} {
    tree mytree
    catch {mytree lappend {IT::EM 0} data foo} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.3.3 {lappend creates missing attribute} {
    tree mytree
    set     result [list]
    lappend result [mytree keyexists root data]
    lappend result [mytree lappend   root data bar]
    lappend result [mytree keyexists root data]
    lappend result [mytree get       root data]
    mytree destroy
    set result
} {0 bar 1 bar}

test tree-${impl}-2.3.4 {lappend appends to attribute value} {
    tree mytree
    set result [list]
    lappend result [mytree set     root data foo]
    lappend result [mytree lappend root data bar]
    lappend result [mytree get     root data]
    mytree destroy
    set result
} {foo {foo bar} {foo bar}}

############################################################

test tree-${impl}-2.4.1 {get gives error on bogus node} {
    tree mytree
    catch {mytree get {IT::EM 0} data} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.4.2 {get gives error on bogus key} {
    tree mytree
    catch {mytree get root bogus} msg
    mytree destroy
    set msg
} {invalid key "bogus" for node "root"}

test tree-${impl}-2.4.3 {get gives error on bogus key} {
    tree mytree
    mytree set root foo far
    catch {mytree get root bogus} msg
    mytree destroy
    set msg
} {invalid key "bogus" for node "root"}

test tree-${impl}-2.4.4 {get} {
    tree mytree
    mytree set root boom foobar
    set result [mytree get root boom]
    mytree destroy
    set result
} foobar

############################################################

test tree-${impl}-2.5.1 {getall, wrong # args} {
    tree mytree
    catch {mytree getall root data foo} msg
    mytree destroy
    set msg
} [tmTooMany getall {node ?pattern?}]

test tree-${impl}-2.5.2 {getall gives error on bogus node} {
    tree mytree
    catch {mytree getall {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.5.3 {getall without attributes returns empty string} {
    tree mytree
    set results [mytree getall root]
    mytree destroy
    set results
} {}

test tree-${impl}-2.5.4 {getall returns dictionary} {
    tree mytree
    mytree set root data  foobar
    mytree set root other thing
    set results [dictsort [mytree getall root]]
    mytree destroy
    set results
} {data foobar other thing}

test tree-${impl}-2.5.5 {getall matches key pattern} {
    tree mytree
    mytree set root data  foobar
    mytree set root other thing
    set results [dictsort [mytree getall root d*]]
    mytree destroy
    set results
} {data foobar}

############################################################

test tree-${impl}-2.6.1 {unset, wrong # args} {
    tree mytree
    catch {mytree unset root flaboozle foobar} msg
    mytree destroy
    set msg
} [tmTooMany unset {node key}]

test tree-${impl}-2.6.2 {unset gives error on bogus node} {
    tree mytree
    catch {mytree unset {IT::EM 0} data} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.6.3 {unset does not give error on bogus key} {
    tree mytree
    set result [catch {mytree unset root bogus}]
    mytree destroy
    set result
} 0

test tree-${impl}-2.6.4 {unset does not give error on bogus key} {
    tree mytree
    mytree set root foo ""
    set result [catch {mytree unset root bogus}]
    mytree destroy
    set result
} 0

test tree-${impl}-2.6.5 {unset removes attribute from node} {
    tree mytree
    set     result [list]
    lappend result [mytree keyexists root foobar]
    mytree set root foobar foobar
    lappend result [mytree keyexists root foobar]
    mytree unset root foobar
    lappend result [mytree keyexists root foobar]
    mytree destroy
    set result
} {0 1 0}

test tree-${impl}-2.6.6 {unset followed by node delete} {
    tree mytree
    set result [list]
    set n [mytree insert root end]
    mytree set $n foo bar
    mytree unset $n foo
    mytree delete $n
    set result [mytree exists $n]
    mytree destroy
    set result
} 0

############################################################

test tree-${impl}-2.7.1 {keys, wrong # args} {
    tree mytree
    catch {mytree keys root flaboozle foobar} msg
    mytree destroy
    set msg
} [tmTooMany keys {node ?pattern?}]

test tree-${impl}-2.7.2 {keys gives error on bogus node} {
    tree mytree
    catch {mytree keys {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.7.3 {keys returns empty list for nodes without attributes} {
    tree mytree
    set results [mytree keys root]
    mytree destroy
    set results
} {}

test tree-${impl}-2.7.4 {keys returns list of keys} {
    tree mytree
    mytree set root data foobar
    mytree set root other thing
    set results [mytree keys root]
    mytree destroy
    lsort $results
} {data other}

test tree-${impl}-2.7.5 {keys matches pattern} {
    tree mytree
    mytree set root data foobar
    mytree set root other thing
    set results [mytree keys root d*]
    mytree destroy
    set results
} data

############################################################

test tree-${impl}-2.8.1 {keyexists, wrong # args} {
    tree mytree
    catch {mytree keyexists root} msg
    mytree destroy
    set msg
} [tmWrong keyexists {node key} 1]
  
test tree-${impl}-2.8.2 {keyexists, wrong # args} {
    tree mytree
    catch {mytree keyexists root foo far} msg
    mytree destroy
    set msg
} [tmTooMany keyexists {node key}]
  
test tree-${impl}-2.8.3 {keyexists gives error on bogus node} {
    tree mytree
    catch {mytree keyexists {IT::EM 0} foo} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-2.8.4 {keyexists returns false on non-existant key} {
    tree mytree
    set result [mytree keyexists root bogus]
    mytree destroy
    set result
} 0

test tree-${impl}-2.8.5 {keyexists returns false on non-existant key} {
    tree mytree
    mytree set root ok ""
    set result [mytree keyexists root bogus]
    mytree destroy
    set result
} 0

test tree-${impl}-2.8.6 {keyexists returns true for existing key} {
    tree mytree
    mytree set root ok ""
    set result [mytree keyexists root ok]
    mytree destroy
    set result
} 1

############################################################
# III. Structural operations ...
# - isleaf, parent, children, numchildren, ancestors, descendants
# - nodes, leaves
# - exists, size, depth, height
# - insert, delete, move, cut, splice, swap
# - rename, rootname
############################################################

############################################################

test tree-${impl}-3.1.1 {isleaf, wrong # args} {
    tree mytree
    catch {mytree isleaf {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany isleaf {node}]

test tree-${impl}-3.1.2 {isleaf} {
    tree mytree
    catch {mytree isleaf {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.1.3 {isleaf} {
    tree mytree
    set     result [mytree isleaf root]

    mytree insert root end {IT::EM 0}
    lappend result [mytree isleaf root]
    lappend result [mytree isleaf {IT::EM 0}]
    mytree destroy
    set result
} {1 0 1}

############################################################

test tree-${impl}-3.2.1 {parent, wrong # args} {
    tree mytree
    catch {mytree parent {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany parent {node}]

test tree-${impl}-3.2.2 {parent gives error on fake node} {
    tree mytree
    catch {mytree parent {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.2.3 {parent gives correct value} {
    tree mytree
    mytree insert root end {IT::EM 0}
    set result [mytree parent {IT::EM 0}]
    mytree destroy
    set result
} {root}

test tree-${impl}-3.2.4 {parent of root is empty string} {
    tree mytree
    set result [mytree parent root]
    mytree destroy
    set result
} {}

############################################################

test tree-${impl}-3.3.1 {children, wrong # args} {
    tree mytree
    catch {mytree children {IT::EM 0} foo} result
    mytree destroy
    set result
} "wrong # args: should be \"$MY children ?-all? node ?filter cmd?\""

test tree-${impl}-3.3.2 {children, bad node} {
    tree mytree
    catch {mytree children {IT::EM 0}} result
    mytree destroy
    set result
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.3.3 {children of root, initial} {
    tree mytree
    set result [mytree children root]
    mytree destroy
    set result
} {}

test tree-${impl}-3.3.4 {children} {
    tree mytree
    set     result [list]

    lappend result [mytree children root]

    mytree insert root       end {IT::EM 0}
    mytree insert root       end {IT::EM 1}
    mytree insert root       end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 0} end {IT::EM 4}

    lappend result [mytree children root]
    lappend result [mytree children {IT::EM 0}]
    lappend result [mytree children {IT::EM 1}]
    mytree destroy
    set result
} {{} {{IT::EM 0} {IT::EM 1} {IT::EM 2}} {{IT::EM 3} {IT::EM 4}} {}}

test tree-${impl}-3.3.5 {children, -all} {
    tree mytree
    set     result [list]

    mytree insert root end 0
    mytree insert root end 1
    mytree insert root end 2
    mytree insert 0    end 3
    mytree insert 0    end 4
    mytree insert 4    end 5
    mytree insert 4    end 6

    set     result {}
    lappend result [lsort [mytree children -all root]]
    lappend result [lsort [mytree children -all 0]]
    mytree destroy
    set result
} {{0 1 2 3 4 5 6} {3 4 5 6}}

test tree-${impl}-3.3.6 {children, filtering} {
    tree mytree
    set     result [list]

    mytree insert root end 0 ; mytree set 0 volume 30
    mytree insert root end 1
    mytree insert root end 2
    mytree insert 0    end 3
    mytree insert 0    end 4
    mytree insert 4    end 5 ; mytree set 5 volume 50
    mytree insert 4    end 6

    proc vol {t n} {
	$t keyexists $n volume
    }
    proc vgt40 {t n} {
	if {![$t keyexists $n volume]} {return 0}
	expr {[$t get $n volume] > 40}
    }

    set     result {}
    lappend result [lsort [mytree children -all root filter vol]]
    lappend result [lsort [mytree children -all root filter vgt40]]
    lappend result [lsort [mytree children      root filter vol]]
    lappend result [lsort [mytree children      root filter vgt40]]
    mytree destroy
    rename vol   {}
    rename vgt40 {}
    set result
} {{0 5} 5 0 {}}

test tree-${impl}-3.3.7 {children, bad filter keyword} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return 1}

    catch {mytree children root snarf ff} msg

    mytree destroy
    rename ff {}
    set msg
} "wrong # args: should be \"$MY children ?-all? node ?filter cmd?\""

test tree-${impl}-3.3.8 {children, bad filter keyword, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return 1}

    catch {mytree children -all root snarf ff} msg

    mytree destroy
    rename ff {}
    set msg
} "wrong # args: should be \"$MY children ?-all? node ?filter cmd?\""

test tree-${impl}-3.3.9 {children, empty filter} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children root filter {}} msg

    mytree destroy
    set msg
} "wrong # args: should be \"$MY children ?-all? node ?filter cmd?\""

test tree-${impl}-3.3.10 {children, empty filter, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children -all root filter {}} msg

    mytree destroy
    set msg
} "wrong # args: should be \"$MY children ?-all? node ?filter cmd?\""

test tree-${impl}-3.3.11 {children, filter cmdprefix not a list} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children root filter "\{"} msg

    mytree destroy
    set msg
} {unmatched open brace in list}

test tree-${impl}-3.3.12 {children, filter cmdprefix not a list, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children -all root filter "\{"} msg

    mytree destroy
    set msg
} {unmatched open brace in list}

test tree-${impl}-3.3.13 {children, filter, unknown command} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children root filter ::bogus} msg

    mytree destroy
    set msg
} {invalid command name "::bogus"}

test tree-${impl}-3.3.14 {children, filter, unknown command, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree children -all root filter ::bogus} msg

    mytree destroy
    set msg
} {invalid command name "::bogus"}

test tree-${impl}-3.3.15 {children, filter returning error} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return -code error "boo"}

    catch {mytree children root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {boo}

test tree-${impl}-3.3.16 {children, filter returning error, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return -code error "boo"}

    catch {mytree children -all root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {boo}

test tree-${impl}-3.3.17 {children, filter result not boolean} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return "boo"}

    catch {mytree children root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {expected boolean value but got "boo"}

test tree-${impl}-3.3.18 {children, filter result not boolean, -all case} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return "boo"}

    catch {mytree children -all root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {expected boolean value but got "boo"}

############################################################

test tree-${impl}-3.4.1 {numchildren, wrong #args} {
    tree mytree
    catch {mytree numchildren {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany numchildren {node}]

test tree-${impl}-3.4.2 {numchildren, bogus node} {
    tree mytree
    catch {mytree numchildren {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.4.3 {numchildren} {
    tree mytree
    set result [mytree numchildren root]
    mytree insert root end {IT::EM 0}
    lappend result [mytree numchildren root]
    lappend result [mytree numchildren {IT::EM 0}]
    mytree destroy
    set result
} {0 1 0}

test tree-${impl}-3.4.4 {numchildren} {
    tree mytree
    set     result [list]
    lappend result [mytree numchildren root]

    mytree insert root       end {IT::EM 0}
    mytree insert root       end {IT::EM 1}
    mytree insert root       end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 0} end {IT::EM 4}

    lappend result [mytree numchildren root]
    lappend result [mytree numchildren {IT::EM 0}]
    lappend result [mytree numchildren {IT::EM 1}]
    mytree destroy
    set result
} {0 3 2 0}

############################################################

test tree-${impl}-3.5.1 {exists, wrong #args} {
    tree mytree
    catch {mytree exists {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany exists {node}]

test tree-${impl}-3.5.2 {exists} {
    tree mytree
    set     result [list]
    lappend result [mytree exists root]
    lappend result [mytree exists {IT::EM 0}]

    mytree  insert root end {IT::EM 0}
    lappend result [mytree exists {IT::EM 0}]

    mytree  delete {IT::EM 0}
    lappend result [mytree exists {IT::EM 0}]

    mytree destroy
    set result
} {1 0 1 0}

############################################################

test tree-${impl}-3.6.1 {size, wrong # args} {
    tree mytree
    catch {mytree size foo far} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY size ?node?\""

test tree-${impl}-3.6.2 {size gives error on bogus node} {
    tree mytree
    catch {mytree size {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.6.3 {size uses root node as default} {
    tree mytree
    set result [mytree size]
    mytree destroy
    set result
} 0

test tree-${impl}-3.6.4 {size gives correct value} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert root end {IT::EM 2}
    mytree insert root end {IT::EM 3}
    mytree insert root end {IT::EM 4}
    mytree insert root end {IT::EM 5}
    set result [mytree size]
    mytree destroy
    set result
} 6

test tree-${impl}-3.6.5 {size gives correct value} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 1} end {IT::EM 4}
    mytree insert {IT::EM 1} end {IT::EM 5}
    set result [mytree size {IT::EM 0}]
    mytree destroy
    set result
} 5

test tree-${impl}-3.6.6 {size gives correct value} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 1} end {IT::EM 4}
    mytree insert {IT::EM 1} end {IT::EM 5}
    set result [mytree size {IT::EM 1}]
    mytree destroy
    set result
} 2

############################################################

test tree-${impl}-3.7.1 {depth, wrong # args} {
    tree mytree
    catch {mytree depth {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany depth {node}]

test tree-${impl}-3.7.2 {depth} {
    tree mytree
    catch {mytree depth {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.7.3 {depth of root is 0} {
    tree mytree
    set result [mytree depth root]
    mytree destroy
    set result
} 0

test tree-${impl}-3.7.4 {depth is computed correctly} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    mytree insert {IT::EM 2} end {IT::EM 3}
    set result [mytree depth {IT::EM 3}]
    mytree destroy
    set result
} 4

############################################################

test tree-${impl}-3.8.1 {height, wrong # args} {
    tree mytree
    catch {mytree height {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany height {node}]

test tree-${impl}-3.8.2 {height for bogus node fails} {
    tree mytree
    catch {mytree height {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.8.3 {height of root alone is 0} {
    tree mytree
    set result [mytree height root]
    mytree destroy
    set result
} 0

test tree-${impl}-3.8.4 {height is computed correctly} {
    tree mytree
    mytree insert root end 0
    mytree insert 0 end 1
    mytree insert 1 end 2
    mytree insert 2 end 3
    set result [mytree height root]
    mytree destroy
    set result
} 4

############################################################

test tree-${impl}-3.9.1 {insert creates and initializes node} {
    tree mytree
    mytree insert root end {IT::EM 0}
    set result [list ]
    lappend result [mytree exists {IT::EM 0}]
    lappend result [mytree parent {IT::EM 0}]
    lappend result [mytree children {IT::EM 0}]
    lappend result [mytree set {IT::EM 0} data ""]
    lappend result [mytree children root]
    mytree destroy
    set result
} {1 root {} {} {{IT::EM 0}}}

test tree-${impl}-3.9.2 {insert insert nodes in correct location} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert root 0 {IT::EM 2}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 2} {IT::EM 0} {IT::EM 1}}

test tree-${impl}-3.9.3 {insert gives error when trying to insert to a fake parent} {
    tree mytree
    catch {mytree insert {IT::EM 0} end {IT::EM 1}} msg
    mytree destroy
    set msg
} "parent node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.9.4 {insert generates node name when none is given} {
    tree mytree
    set result [list [mytree insert root end]]
    lappend result [mytree insert root end]
    mytree insert root end {IT::EM 3}
    lappend result [mytree insert root end]
    mytree destroy
    set result
} {node1 node2 node3}

test tree-${impl}-3.9.5 {insert inserts multiple nodes properly} {
    tree mytree
    mytree insert root end a b c d e f
    set result [mytree children root]
    mytree destroy
    set result
} {a b c d e f}

test tree-${impl}-3.9.6 {insert moves nodes that exist} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree insert {IT::EM 0} end {IT::EM 4} {IT::EM 5} {IT::EM 6}
    mytree insert root end {IT::EM 4}
    set result [list [mytree children root] [mytree children {IT::EM 0}]]
    mytree destroy
    set result
} [list [list {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3} {IT::EM 4}] [list {IT::EM 5} {IT::EM 6}]]

test tree-${impl}-3.9.7 {insert moves nodes that already exist properly} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    mytree insert root end {IT::EM 1} {IT::EM 2}
    set result [list			\
	    [mytree children root]	\
	    [mytree children {IT::EM 0}]	\
	    [mytree children {IT::EM 1}]	\
	    [mytree parent {IT::EM 1}]	\
	    [mytree parent {IT::EM 2}]	\
	    ]
    mytree destroy
    set result
} [list [list {IT::EM 0} {IT::EM 1} {IT::EM 2}] {} {} root root]

test tree-${impl}-3.9.8 {insert moves multiple nodes properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2}
    mytree insert root 0 {IT::EM 1} {IT::EM 2}
    set result [list			\
	    [mytree children root]	\
	    ]
    mytree destroy
    set result
} {{{IT::EM 1} {IT::EM 2} {IT::EM 0}}}

test tree-${impl}-3.9.9 {insert moves multiple nodes properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2}
    mytree insert root 1 {IT::EM 0} {IT::EM 1}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 0} {IT::EM 1} {IT::EM 2}}

test tree-${impl}-3.9.10 {insert moves node within parent properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree insert root 2 {IT::EM 1}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}}

test tree-${impl}-3.9.11 {insert moves node within parent properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree insert {IT::EM 3} end {IT::EM 4} {IT::EM 5} {IT::EM 6}
    mytree insert root 2 {IT::EM 0} {IT::EM 4} {IT::EM 5} {IT::EM 6}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 0} {IT::EM 4} {IT::EM 5} {IT::EM 6} {IT::EM 2} {IT::EM 3}}

test tree-${impl}-3.9.12 {insert moves node in parent properly when oldInd < newInd} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree insert root 2 {IT::EM 0}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 0} {IT::EM 2} {IT::EM 3}}

test tree-${impl}-3.9.13 {insert gives error when trying to move root} {
    tree mytree
    catch {mytree insert root end root} msg
    mytree destroy
    set msg
} {cannot move root node}

test tree-${impl}-3.9.14 {insert gives error when trying to make node its descendant} {
    tree mytree
    mytree insert root end {IT::EM 0}
    catch {mytree insert {IT::EM 0} end {IT::EM 0}} msg
    mytree destroy
    set msg
} {node "IT::EM 0" cannot be its own descendant}

test tree-${impl}-3.9.15 {insert gives error when trying to make node its descendant} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    catch {mytree insert {IT::EM 2} end {IT::EM 0}} msg
    mytree destroy
    set msg
} {node "IT::EM 0" cannot be its own descendant}

test tree-${impl}-3.9.17 {check node names with spaces} {
    tree mytree
    catch {mytree insert root end ":\n\t "} msg
    mytree destroy
    set msg
} [list ":\n\t "]

test tree-${impl}-3.9.18 {extended node names with spaces check} {
    tree mytree
    set node ":\n\t "
    set msg [mytree insert root end $node]
    lappend msg [mytree isleaf $node]
    mytree insert $node end yummy
    lappend msg [mytree size $node]
    lappend msg [mytree isleaf $node]
    mytree set $node data foo
    set ::FOO {}
    mytree walk root n {walker $n}
    lappend msg $::FOO
    lappend msg [mytree keys $node]
    lappend msg [mytree parent $node]
    lappend msg [mytree set $node data]
    mytree destroy
    set msg
} [list ":\n\t " 1 1 0 [list root ":\n\t " yummy] data root foo]

test tree-${impl}-3.9.19a {insert fails for a bad index} {!tcl8.5plus||tree_critcl} {
    tree mytree
    catch {mytree insert root foo new-node} msg
    mytree destroy
    set msg
} {bad index "foo": must be integer or end?-integer?}

test tree-${impl}-3.9.19b {insert fails for a bad index} {tcl8.5plus&&!tree_critcl} {
    tree mytree
    catch {mytree insert root foo new-node} msg
    mytree destroy
    set msg
} {bad index "foo": must be integer?[+-]integer? or end?[+-]integer?}

test tree-${impl}-3.9.20 {insert insert nodes in correct location} {
    tree mytree
    mytree insert root end   a
    mytree insert root end   b
    mytree insert root 0     c
    mytree insert root end-1 d
    set result [mytree children root]
    mytree destroy
    set result
} {c a d b}

############################################################

test tree-${impl}-3.10.1 {delete} {
    tree mytree
    catch {mytree delete root} msg
    mytree destroy
    set msg
} {cannot delete root node}

test tree-${impl}-3.10.2 {delete} {
    tree mytree
    catch {mytree delete {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.10.3 {delete, only this node} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree delete {IT::EM 0}
    set result [list [mytree exists {IT::EM 0}] [mytree children root]]
    mytree destroy
    set result
} {0 {}}

test tree-${impl}-3.10.4 {delete, node and children} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    mytree delete {IT::EM 0}
    set result [list [mytree exists {IT::EM 0}] \
	    [mytree exists {IT::EM 1}] \
	    [mytree exists {IT::EM 2}]]
    mytree destroy
    set result
} {0 0 0}

############################################################

test tree-${impl}-3.11.1 {move gives error when trying to move root} {
    tree mytree
    mytree insert root end {IT::EM 0}
    catch {mytree move {IT::EM 0} end root} msg
    mytree destroy
    set msg
} {cannot move root node}

test tree-${impl}-3.11.2 {move gives error when trying to move non existant node} {
    tree mytree
    catch {mytree move root end {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.11.3 {move gives error when trying to move to non existant parent} {
    tree mytree
    catch {mytree move {IT::EM 0} end {IT::EM 0}} msg
    mytree destroy
    set msg
} "parent node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.11.4 {move gives error when trying to make node its own descendant} {
    tree mytree
    mytree insert root end {IT::EM 0}
    catch {mytree move {IT::EM 0} end {IT::EM 0}} msg
    mytree destroy
    set msg
} {node "IT::EM 0" cannot be its own descendant}

test tree-${impl}-3.11.5 {move gives error when trying to make node its own descendant} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    catch {mytree move {IT::EM 2} end {IT::EM 0}} msg
    mytree destroy
    set msg
} {node "IT::EM 0" cannot be its own descendant}

test tree-${impl}-3.11.6 {move correctly moves a node} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    mytree move {IT::EM 0} end {IT::EM 2}
    set result [list [mytree children {IT::EM 0}] [mytree children {IT::EM 1}]]
    lappend result [mytree parent {IT::EM 2}]
    mytree destroy
    set result
} {{{IT::EM 1} {IT::EM 2}} {} {IT::EM 0}}

test tree-${impl}-3.11.7 {move moves multiple nodes properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2}
    mytree move root 0 {IT::EM 1} {IT::EM 2}
    set result [list			\
	    [mytree children root]	\
	    ]
    mytree destroy
    set result
} {{{IT::EM 1} {IT::EM 2} {IT::EM 0}}}

test tree-${impl}-3.11.8 {move moves multiple nodes properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2}
    mytree move root 1 {IT::EM 0} {IT::EM 1}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 2} {IT::EM 0} {IT::EM 1}}

test tree-${impl}-3.11.9 {move moves node within parent properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree move root 2 {IT::EM 1}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 0} {IT::EM 2} {IT::EM 1} {IT::EM 3}}

test tree-${impl}-3.11.10 {move moves node within parent properly} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree insert {IT::EM 3} end {IT::EM 4} {IT::EM 5} {IT::EM 6}
    mytree move root 2 {IT::EM 0} {IT::EM 4} {IT::EM 5} {IT::EM 6}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 2} {IT::EM 0} {IT::EM 4} {IT::EM 5} {IT::EM 6} {IT::EM 3}}

test tree-${impl}-3.11.11 {move moves node in parent properly when oldInd < newInd} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree move root 2 {IT::EM 0}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 2} {IT::EM 0} {IT::EM 3}}

test tree-${impl}-3.11.12 {move node up one} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree move root [mytree index [mytree next {IT::EM 0}]] {IT::EM 0}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 0} {IT::EM 2} {IT::EM 3}}

test tree-${impl}-3.11.13 {move node down one} {
    tree mytree
    mytree insert root end {IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3}
    mytree move root [mytree index [mytree previous {IT::EM 2}]] {IT::EM 2}
    set result [mytree children root]
    mytree destroy
    set result
} {{IT::EM 0} {IT::EM 2} {IT::EM 1} {IT::EM 3}}

test tree-${impl}-3.11.14a {move fails for a bad index} {!tcl8.5plus||tree_critcl} {
    tree mytree
    mytree insert root end node-to-move
    catch {mytree move root foo node-to-move} msg
    mytree destroy
    set msg
} {bad index "foo": must be integer or end?-integer?}

test tree-${impl}-3.11.14b {move fails for a bad index} {tcl8.5plus&&!tree_critcl} {
    tree mytree
    mytree insert root end node-to-move
    catch {mytree move root foo node-to-move} msg
    mytree destroy
    set msg
} {bad index "foo": must be integer?[+-]integer? or end?[+-]integer?}

test tree-${impl}-3.11.15 {move correctly moves a node} {
    tree mytree
    mytree insert root end a
    mytree insert a    end b
    mytree insert a    end d
    mytree insert a    end e
    mytree insert b    end c

    mytree move a end-1 c
    set     result {}
    lappend result [mytree children a]
    lappend result [mytree children b]
    lappend result [mytree parent c]
    mytree destroy
    set result
} {{b d c e} {} a}

############################################################

test tree-${impl}-3.12.1 {cutting nodes} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert root end {IT::EM 2}
    mytree insert {IT::EM 1} end {IT::EM 1.0}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree cut {IT::EM 1}
    set t [list ]
    mytree walk root {a n} {lappend t $a $n}
    mytree destroy
    set t
} {enter root enter {IT::EM 0} enter {IT::EM 1.0} enter {IT::EM 1.1} enter {IT::EM 1.2} enter {IT::EM 2}}

test tree-${impl}-3.12.2 {cutting nodes} {
    tree mytree
    catch {mytree cut root} msg
    mytree destroy
    set msg
} {cannot cut root node}

test tree-${impl}-3.12.3 {cut sets parent values of relocated nodes} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert root end {IT::EM 2}
    mytree insert {IT::EM 1} end {IT::EM 1.0}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree cut {IT::EM 1}
    set res [list \
	    [mytree parent {IT::EM 1.0}] \
	    [mytree parent {IT::EM 1.1}] \
	    [mytree parent {IT::EM 1.2}]]
    mytree destroy
    set res
} {root root root}

test tree-${impl}-3.12.4 {cut removes node} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert root end {IT::EM 2}
    mytree insert {IT::EM 1} end {IT::EM 1.0}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree cut {IT::EM 1}
    set res [mytree exists {IT::EM 1}]
    mytree destroy
    set res
} 0

test tree-${impl}-3.12.5 {cut removes node} {
    tree mytree
    catch {mytree cut {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

############################################################

test tree-${impl}-3.13.0 {splicing nodes with bad parent node} {
    tree mytree
    catch {mytree splice foo 0 end} msg
    mytree destroy
    set msg
} "node \"foo\" does not exist in tree \"$MY\""

test tree-${impl}-3.13.1 {splicing nodes} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # * 1.0     - 1
    # * 1.1       - 1.0
    # * 1.2       - 1.1
    # - 2         - 1.2
    #           - 2

    mytree splice root 1 3 {IT::EM 1}
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
	enter root \
	enter {IT::EM 0} \
	leave {IT::EM 0} \
	enter {IT::EM 1} \
	enter {IT::EM 1.0} \
	leave {IT::EM 1.0} \
	enter {IT::EM 1.1} \
	leave {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1} \
	enter {IT::EM 2} \
	leave {IT::EM 2} \
	leave root \
	]

test tree-${impl}-3.13.2 {splicing nodes with no node name given} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # * 1.0     - node1
    # * 1.1       - 1.0
    # * 1.2       - 1.1
    # - 2         - 1.2
    #           - 2

    set res [mytree splice root 1 3]
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    list $res $t
} [list node1 [list \
	enter root \
	enter {IT::EM 0} \
	leave {IT::EM 0} \
	enter node1 \
	enter {IT::EM 1.0} \
	leave {IT::EM 1.0} \
	enter {IT::EM 1.1} \
	leave {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave node1 \
	enter {IT::EM 2} \
	leave {IT::EM 2} \
	leave root \
	]]

test tree-${impl}-3.13.3 {splicing nodes errors on duplicate node name} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}
    catch {mytree splice root 1 3 {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" already exists in tree \"$MY\""

test tree-${impl}-3.13.4 {splicing node sets parent values correctly} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # * 1.0     - 1
    # * 1.1       - 1.0
    # * 1.2       - 1.1
    # - 2         - 1.2
    #           - 2

    mytree splice root 1 3 {IT::EM 1}
    set res [list \
	    [mytree parent {IT::EM 1}] \
	    [mytree parent {IT::EM 1.0}] \
	    [mytree parent {IT::EM 1.1}] \
	    [mytree parent {IT::EM 1.2}]]
    mytree destroy
    set res
} {root {IT::EM 1} {IT::EM 1} {IT::EM 1}}

test tree-${impl}-3.13.5 {splicing node works with strange index} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 1
    # * 1.0       - 0
    # * 1.1       - 1.0
    # * 1.2       - 1.1
    # - 2         - 1.2
    #             - 2

    mytree splice root -5 12 {IT::EM 1}
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 1} \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave {IT::EM 1} \
       leave root \
      ]

test tree-${impl}-3.13.6 {splicing nodes with no node name and no "to" index given} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # - 1.0     - node1
    # - 1.1       - 1.0
    # - 1.2       - 1.1
    # - 2         - 1.2
    #             - 2

    mytree splice root 1
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter node1 \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave node1 \
       leave root \
      ]

test tree-${impl}-3.13.7 {splicing nodes with to == end} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # - 1.0     - node1
    # - 1.1       - 1.0
    # - 1.2       - 1.1
    # - 2         - 1.2
    #             - 2

    mytree splice root 1 end
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter node1 \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave node1 \
       leave root \
      ]

test tree-${impl}-3.13.8 {splicing nodes with to == end-1} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # - 1.0     - node1
    # - 1.1       - 1.0
    # - 1.2       - 1.1
    # - 2         - 1.2
    #           - 2

    mytree splice root 1 end-1
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter node1 \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       leave node1 \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave root \
      ]

test tree-${impl}-3.13.9 {splicing nodes} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # - 1.0     - node1
    # - 1.1       - 1.0
    # - 1.2       - 1.1
    # - 2         - 1.2
    #             - 2

    mytree splice root end-3 end
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter node1 \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave node1 \
       leave root \
      ]

test tree-${impl}-3.13.10 {splicing nodes} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1.0}
    mytree insert root end {IT::EM 1.1}
    mytree insert root end {IT::EM 1.2}
    mytree insert root end {IT::EM 2}

    # root  --> root
    # - 0       - 0
    # - 1.0     - node1
    # - 1.1       - 1.0
    # - 1.2       - 1.1
    # - 2         - 1.2
    #           - 2

    mytree splice root end-3 end-1
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list \
       enter root \
       enter {IT::EM 0} \
       leave {IT::EM 0} \
       enter node1 \
       enter {IT::EM 1.0} \
       leave {IT::EM 1.0} \
       enter {IT::EM 1.1} \
       leave {IT::EM 1.1} \
       enter {IT::EM 1.2} \
       leave {IT::EM 1.2} \
       leave node1 \
       enter {IT::EM 2} \
       leave {IT::EM 2} \
       leave root \
      ]

############################################################

test tree-${impl}-3.14.1 {swap gives error when trying to swap root} {
    tree mytree
    catch {mytree swap root {IT::EM 0}} msg
    mytree destroy
    set msg
} {cannot swap root node}

test tree-${impl}-3.14.2 {swap gives error when trying to swap non existant node} {
    tree mytree
    catch {mytree swap {IT::EM 0} {IT::EM 1}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.14.3 {swap gives error when trying to swap non existant node} {
    tree mytree
    mytree insert root end {IT::EM 0}
    catch {mytree swap {IT::EM 0} {IT::EM 1}} msg
    mytree destroy
    set msg
} "node \"IT::EM 1\" does not exist in tree \"$MY\""

test tree-${impl}-3.14.4 {swap gives error when trying to swap node with self} {
    tree mytree
    mytree insert root end {IT::EM 0}
    catch {mytree swap {IT::EM 0} {IT::EM 0}} msg
    mytree destroy
    set msg
} {cannot swap node "IT::EM 0" with itself}

test tree-${impl}-3.14.5 {swap swaps node relationships correctly} {
    tree mytree
    mytree insert root end 0
    mytree insert 0 end 0.1
    mytree insert 0 end 0.2
    mytree insert 0.1 end 0.1.1
    mytree insert 0.1 end 0.1.2

    # root     --> root        
    # * 0	   * 0.1       
    #   * 0.1	     * 0       
    #     - 0.1.1      - 0.1.1 
    #     - 0.1.2      - 0.1.2 
    #   - 0.2	     - 0.2     

    mytree swap 0 0.1
    set t [list]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root  \
	enter 0.1   \
	enter 0     \
	enter 0.1.1 \
	leave 0.1.1 \
	enter 0.1.2 \
	leave 0.1.2 \
	leave 0     \
	enter 0.2   \
	leave 0.2   \
	leave 0.1   \
	leave root  \
	]

test tree-${impl}-3.14.6 {swap swaps node relationships correctly} {
    tree mytree
    mytree insert root end 0
    mytree insert 0 end 0.1
    mytree insert 0 end 0.2
    mytree insert 0.1 end 0.1.1
    mytree insert 0.1 end 0.1.2

    # root    --> root       
    # * 0	  * 0.1.1    
    #   - 0.1	    - 0.1    
    #     * 0.1.1     * 0    
    #     - 0.1.2     - 0.1.2
    #   - 0.2	    - 0.2    

    mytree swap 0 0.1.1
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root  \
	enter 0.1.1 \
	enter 0.1   \
	enter 0     \
	leave 0     \
	enter 0.1.2 \
	leave 0.1.2 \
	leave 0.1   \
	enter 0.2   \
	leave 0.2   \
	leave 0.1.1 \
	leave root  \
	]

test tree-${impl}-3.14.7 {swap swaps node relationships correctly} {
    tree mytree
    mytree insert root end 0
    mytree insert root end 1
    mytree insert 0 end 0.1
    mytree insert 1 end 1.1

    # root --> root   
    # * 0      * 1    
    #   - 0.1    - 0.1
    # * 1      * 0    
    #   - 1.1    - 1.1

    mytree swap 0 1
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root \
	enter 1    \
	enter 0.1  \
	leave 0.1  \
	leave 1    \
	enter 0    \
	enter 1.1  \
	leave 1.1  \
	leave 0    \
	leave root \
	]

test tree-${impl}-3.14.8 {swap swaps node relationships correctly} {
    tree mytree
    mytree insert root end 0
    mytree insert 0 end 0.1
    mytree insert 0 end 0.2
    mytree insert 0.1 end 0.1.1
    mytree insert 0.1 end 0.1.2

    # root     --> root        
    # * 0	   * 0.1       
    #   * 0.1	     * 0       
    #     - 0.1.1      - 0.1.1 
    #     - 0.1.2      - 0.1.2 
    #   - 0.2	     - 0.2

    mytree swap 0.1 0
    set t [list ]
    mytree walk root -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root  \
	enter 0.1   \
	enter 0     \
	enter 0.1.1 \
	leave 0.1.1 \
	enter 0.1.2 \
	leave 0.1.2 \
	leave 0     \
	enter 0.2   \
	leave 0.2   \
	leave 0.1   \
	leave root  \
	]

test tree-${impl}-3.14.9 {swap keeps attributes with their nodes} {
    tree mytree
    mytree insert root end 0 1 2 3
    mytree set 0 attr a
    mytree set 1 attr b
    mytree set 2 attr c
    mytree set 3 attr d

    mytree swap 0 3

    set res [list \
		 [mytree children root] \
		 [mytree get 0 attr] \
		 [mytree get 1 attr] \
		 [mytree get 2 attr] \
		 [mytree get 3 attr]]

    mytree destroy
    set res
} {{3 1 2 0} a b c d}

############################################################

test tree-${impl}-3.15.1 {rootname, wrong # args} {
    tree mytree
    catch {mytree rootname foo far} result
    mytree destroy
    set result
} [tmTooMany rootname {}]

test tree-${impl}-3.15.2 {rootname} {
    tree mytree
    set result [mytree rootname]
    mytree destroy
    set result
} root

############################################################

test tree-${impl}-3.16.1 {rename, wrong # args} {
    tree mytree
    catch {mytree rename foo far fox} result
    mytree destroy
    set result
} [tmTooMany rename {node newname}]

test tree-${impl}-3.16.2 {rename of bogus node fails} {
    tree mytree
    catch {mytree rename 0 foo} result
    mytree destroy
    set result
} "node \"0\" does not exist in tree \"$MY\""

test tree-${impl}-3.16.3 {rename, setting to existing node fails} {
    tree mytree
    mytree insert root end 0
    catch {mytree rename root 0} result
    mytree destroy
    set result
} "unable to rename node to \"0\", node of that name already present in the tree \"$MY\""

test tree-${impl}-3.16.4 {rename root, setting} {
    tree mytree
    set result [list]
    lappend result [mytree rootname]
    lappend result [mytree rename root foo]
    lappend result [mytree rootname]
    mytree destroy
    set result
} {root foo foo}

test tree-${impl}-3.16.5 {rename root, parents} {
    tree mytree
    mytree insert root end 0
    set result [list]
    lappend result [mytree parent 0]
    mytree rename root foo
    lappend result [mytree parent 0]
    mytree destroy
    set result
} {root foo}

test tree-${impl}-3.16.6 {rename root, existence} {
    tree mytree
    set result [list]
    lappend result [mytree exists root]
    lappend result [mytree exists 0]
    mytree rename root 0
    lappend result [mytree exists root]
    lappend result [mytree exists 0]
    mytree destroy
    set result
} {1 0 0 1}

test tree-${impl}-3.16.7 {rename root, children} {
    tree mytree
    mytree insert root end xx
    set result [list]
    lappend result [mytree children root]
    lappend result [catch {mytree children foo}]
    mytree rename root foo
    lappend result [mytree children foo]
    lappend result [catch {mytree children root}]
    mytree destroy
    set result
} {xx 1 xx 1}

test tree-${impl}-3.16.8 {rename root, attributes} {
    tree mytree
    mytree set root data foo
    set result [list]
    lappend result [mytree getall root]
    lappend result [catch {mytree getall foo}]
    mytree rename root foo
    lappend result [mytree getall foo]
    lappend result [catch {mytree getall root}]
    mytree destroy
    set result
} {{data foo} 1 {data foo} 1}

test tree-${impl}-3.16.9 {rename node, index} {
    tree mytree
    set result [list]
    mytree insert root end 0
    mytree insert root end 1
    mytree insert root end 2
    lappend result [mytree index 1]
    lappend result [mytree rename 1 foo]
    lappend result [mytree index foo]
    mytree destroy
    set result
} {1 foo 1}

############################################################

test tree-${impl}-3.17.1 {ancestors, wrong # args} {
    tree mytree
    catch {mytree ancestors {IT::EM 0} foo} msg
    mytree destroy
    set msg
} [tmTooMany ancestors {node}]

test tree-${impl}-3.17.2 {ancestors gives error on fake node} {
    tree mytree
    catch {mytree ancestors {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-3.17.3 {ancestors gives correct value} {
    tree mytree
    mytree insert root       end {IT::EM 0}
    mytree insert {IT::EM 0} end {IT::EM 1}
    mytree insert {IT::EM 1} end {IT::EM 2}
    set result [mytree ancestors {IT::EM 2}]
    mytree destroy
    set result
} {{IT::EM 1} {IT::EM 0} root}

test tree-${impl}-3.17.4 {ancestors of root is empty string} {
    tree mytree
    set result [mytree ancestors root]
    mytree destroy
    set result
} {}

############################################################

test tree-${impl}-3.18.1 {descendants} {
    tree mytree
    set     result [list]

    mytree insert root end 0
    mytree insert root end 1
    mytree insert root end 2
    mytree insert 0    end 3
    mytree insert 0    end 4
    mytree insert 4    end 5
    mytree insert 4    end 6

    set     result {}
    lappend result [lsort [mytree descendants root]]
    lappend result [lsort [mytree descendants 0]]
    mytree destroy
    set result
} {{0 1 2 3 4 5 6} {3 4 5 6}}

test tree-${impl}-3.18.2 {descendants, filtering} {
    tree mytree
    set     result [list]

    mytree insert root end 0 ; mytree set 0 volume 30
    mytree insert root end 1
    mytree insert root end 2
    mytree insert 0    end 3
    mytree insert 0    end 4
    mytree insert 4    end 5 ; mytree set 5 volume 50
    mytree insert 4    end 6

    proc vol {t n} {
	$t keyexists $n volume
    }
    proc vgt40 {t n} {
	if {![$t keyexists $n volume]} {return 0}
	expr {[$t get $n volume] > 40}
    }

    set     result {}
    lappend result [lsort [mytree descendants root filter vol]]
    lappend result [lsort [mytree descendants root filter vgt40]]
    mytree destroy
    set result
} {{0 5} 5}

test tree-${impl}-3.18.3 {descendants, bad filter keyword} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return 1}

    catch {mytree descendants root snarf ff} msg

    mytree destroy
    rename ff {}
    set msg
} "wrong # args: should be \"$MY descendants node ?filter cmd?\""

test tree-${impl}-3.18.4 {descendants, empty filter} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree descendants root filter {}} msg

    mytree destroy
    set msg
} "wrong # args: should be \"$MY descendants node ?filter cmd?\""

test tree-${impl}-3.18.5 {descendants, filter cmdprefix not a list} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree descendants root filter "\{"} msg

    mytree destroy
    set msg
} {unmatched open brace in list}

test tree-${impl}-3.18.6 {descendants, filter, unknown command} {
    tree mytree
    mytree insert root end a
    mytree insert root end b

    catch {mytree descendants root filter ::bogus} msg

    mytree destroy
    set msg
} {invalid command name "::bogus"}

test tree-${impl}-3.18.7 {descendants, filter returning error} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return -code error "boo"}

    catch {mytree descendants root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {boo}

test tree-${impl}-3.18.8 {descendants, filter result not boolean} {
    tree mytree
    mytree insert root end a
    mytree insert root end b
    proc ff {t n} {return "boo"}

    catch {mytree descendants root filter ::ff} msg

    mytree destroy
    rename ff {}
    set msg
} {expected boolean value but got "boo"}

############################################################

test tree-${impl}-3.19.1a {nodes, wrong # args} {tcl8.4plus} {
    tree mytree
    catch {mytree nodes {IT::EM 0} foo} result
    mytree destroy
    set result
} [tmWrong nodes {} 0]

test tree-${impl}-3.19.1b {nodes, wrong # args} {!tcl8.4plus} {
    tree mytree
    catch {mytree nodes {IT::EM 0} foo} result
    mytree destroy
    set result
} [tmTooMany nodes {node}]

test tree-${impl}-3.19.2 {nodes of initial tree} {
    tree mytree
    set result [mytree nodes]
    mytree destroy
    set result
} {root}

test tree-${impl}-3.19.3 {nodes} {
    tree mytree
    set     result [list]

    lappend result [mytree nodes]

    mytree insert root       end {IT::EM 0}
    mytree insert root       end {IT::EM 1}
    mytree insert root       end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 0} end {IT::EM 4}

    lappend result [lsort [mytree nodes]]
    mytree destroy
    set result
} {root {{IT::EM 0} {IT::EM 1} {IT::EM 2} {IT::EM 3} {IT::EM 4} root}}


############################################################

test tree-${impl}-3.20.1a {leaves, wrong # args} {tcl8.4plus} {
    tree mytree
    catch {mytree leaves {IT::EM 0} foo} result
    mytree destroy
    set result
} [tmWrong leaves {} 0]

test tree-${impl}-3.20.1b {leaves, wrong # args} {!tcl8.4plus} {
    tree mytree
    catch {mytree leaves {IT::EM 0} foo} result
    mytree destroy
    set result
} [tmTooMany leaves {node}]

test tree-${impl}-3.20.2 {leaves of initial tree} {
    tree mytree
    set result [mytree leaves]
    mytree destroy
    set result
} {root}

test tree-${impl}-3.20.3 {leaves} {
    tree mytree
    set     result [list]

    lappend result [mytree leaves]

    mytree insert root       end {IT::EM 0}
    mytree insert root       end {IT::EM 1}
    mytree insert root       end {IT::EM 2}
    mytree insert {IT::EM 0} end {IT::EM 3}
    mytree insert {IT::EM 0} end {IT::EM 4}

    lappend result [lsort [mytree leaves]]
    mytree destroy
    set result
} {root {{IT::EM 1} {IT::EM 2} {IT::EM 3} {IT::EM 4}}}

############################################################
# IV. Navigation in the tree
# - index, next, previous, walk
############################################################

############################################################

test tree-${impl}-4.1.1 {index, wrong # args} {
    tree mytree
    catch {mytree index root foo} msg
    mytree destroy
    set msg
} [tmTooMany index {node}]

test tree-${impl}-4.1.2 {index of non-existant node} {
    tree mytree
    catch {mytree index {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-4.1.3 {index of root fails} {
    tree mytree
    catch {mytree index root} msg
    mytree destroy
    set msg
} {cannot determine index of root node}

test tree-${impl}-4.1.4 {index} {
    tree mytree
    mytree insert root end {IT::EM 1}
    mytree insert root end {IT::EM 0}
    set     result [list]
    lappend result [mytree index {IT::EM 0}]
    lappend result [mytree index {IT::EM 1}]
    mytree destroy
    set result
} {1 0}

############################################################

test tree-${impl}-4.2.1 {next, wrong # args} {
    tree mytree
    mytree insert root end 0
    catch {mytree next 0 foo} msg
    mytree destroy
    set msg
} [tmTooMany next {node}]

test tree-${impl}-4.2.2 {next for bogus node} {
    tree mytree
    catch {mytree next {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-4.2.3 {next from root} {
    tree mytree
    set res [mytree next root]
    mytree destroy
    set res
} {}

test tree-${impl}-4.2.4 {next} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    set res [list [mytree next {IT::EM 0}] [mytree next {IT::EM 1}]]
    mytree destroy
    set res
} {{IT::EM 1} {}}

############################################################

test tree-${impl}-4.3.1 {previous, wrong # args} {
    tree mytree
    mytree insert root end 0
    catch {mytree previous 0 foo} msg
    mytree destroy
    set msg
} [tmTooMany previous {node}]

test tree-${impl}-4.3.2 {previous for bogus node} {
    tree mytree
    catch {mytree previous {IT::EM 0}} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-4.3.3 {previous from root} {
    tree mytree
    set res [mytree previous root]
    mytree destroy
    set res
} {}

test tree-${impl}-4.3.4 {previous} {
    tree mytree
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    set res [list [mytree previous {IT::EM 0}] [mytree previous {IT::EM 1}]]
    mytree destroy
    set res
} {{} {IT::EM 0}}

############################################################

test tree-${impl}-4.4.1 {walk with too few args} {badTest} {
    tree mytree
    catch {mytree walk} msg
    mytree destroy
    set msg
} {no value given for parameter "node" to "::struct::tree::_walk"}

test tree-${impl}-4.4.2 {walk with too few args} {
    tree mytree
    catch {mytree walk root} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walk node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? loopvar script\""

test tree-${impl}-4.4.3 {walk with too many args} {
    tree mytree
    catch {mytree walk root -foo bar -baz boo -foo2 boo -foo3 baz -foo4 gnar -foo5 schnurr} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walk node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? loopvar script\""

test tree-${impl}-4.4.4 {walk with fake node} {
    tree mytree
    catch {mytree walk {IT::EM 0} {a n} foo} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-4.4.5 {walk gives error on invalid search type} {
    tree mytree
    catch {mytree walk root -type foo {a n} foo} msg
    mytree destroy
    set msg
} {bad search type "foo": must be bfs or dfs}

test tree-${impl}-4.4.6 {walk gives error on invalid search order} {
    tree mytree
    catch {mytree walk root -order foo {a n} foo} msg
    mytree destroy
    set msg
} {bad search order "foo": must be both, in, pre, or post}

test tree-${impl}-4.4.7 {walk gives error on invalid combination of order and type} {
    tree mytree
    catch {mytree walk root -order in -type bfs {a n} foo} msg
    mytree destroy
    set msg
} {unable to do a in-order breadth first walk}

test tree-${impl}-4.4.8 {walk with unknown options} {
    tree mytree
    catch {mytree walk root -foo bar {a n} foo} msg
    mytree destroy
    set msg
} {unknown option "-foo"}

test tree-${impl}-4.4.9 {walk, option without value} {
    tree mytree
    catch {mytree walk root -type dfs -order} msg
    mytree destroy
    set msg
} {value for "-order" missing}

test tree-${impl}-4.4.10 {walk without command} {
    tree mytree
    catch {mytree walk root -order pre} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walk node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? loopvar script\""

test tree-${impl}-4.4.10.1 {walk with too many loop variables} {
    tree mytree
    catch {mytree walk root {a n d} {foo}} msg
    mytree destroy
    set msg
} {too many loop variables, at most two allowed}

test tree-${impl}-4.4.10.2 {walk with empty script} {
    tree mytree
    catch {mytree walk root {a n} {}} msg
    mytree destroy
    set msg
} {no script specified, or empty}

test tree-${impl}-4.4.11.1 {pre dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -type dfs {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

test tree-${impl}-4.4.11.2 {post dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -order post -type dfs {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list leave {IT::EM 0.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0} \
	leave {IT::EM 1.1} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1}   \
	leave root]

test tree-${impl}-4.4.11.3 {both dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -order both -type dfs {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	leave {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	leave {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1}   \
	leave root]

test tree-${impl}-4.4.11.4 {in dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -order in -type dfs {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list visit {IT::EM 0.1} \
	visit {IT::EM 0}   \
	visit {IT::EM 0.2} \
	visit root    \
	visit {IT::EM 1.1} \
	visit {IT::EM 1} \
	visit {IT::EM 1.2}]

test tree-${impl}-4.4.11.7 {pre dfs walk, nodes with spaces in names} {
    tree mytree
    set t [list ]
    mytree insert root end "node 0"
    mytree insert root end "node 1"
    mytree insert "node 0" end "node 0 1"
    mytree insert "node 0" end "node 0 2"
    mytree insert "node 1" end "node 1 1"
    mytree insert "node 1" end "node 1 2"
    mytree walk root -type dfs {a n} {lappend t $n}
    mytree destroy
    set t
} {root {node 0} {node 0 1} {node 0 2} {node 1} {node 1 1} {node 1 2}}

test tree-${impl}-4.4.12.1 {pre bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -type bfs {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0}   \
	enter {IT::EM 1}   \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

test tree-${impl}-4.4.12.2 {post bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -type bfs -order post {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list leave {IT::EM 1.2} \
	leave {IT::EM 1.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0.1} \
	leave {IT::EM 1}   \
	leave {IT::EM 0} \
	leave root]

test tree-${impl}-4.4.12.3 {both bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root -type bfs -order both {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0}   \
	enter {IT::EM 1}   \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0.1} \
	leave {IT::EM 1}   \
	leave {IT::EM 0}   \
	leave root]

test tree-${impl}-4.4.13 {pre dfs is default walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walk root {a n} {lappend t $a $n}
    mytree destroy
    set t
} [list enter root \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . enter c enter 1 enter 2 ==}
    1 dfs post {== leave a . leave c leave 0 leave 1 leave 2 leave root ==}
    2 dfs both {== enter root enter 0 enter a leave a . . enter c leave c leave 0 enter 1 leave 1 enter 2 leave 2 leave root ==}
    3 dfs in   {== visit a visit 0 . visit c visit root visit 1 visit 2 ==}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter a . enter c ==}
    5 bfs post {== leave c . leave a leave 2 leave 1 leave 0 leave root ==}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter a . enter c leave c . leave a leave 2 leave 1 leave 0 leave root ==}
} {
    test tree-${impl}-4.4.14.$n "continue in walk $type/$order" {
	tree mytree
	set t [list ]
	mytree insert root end 0 1 2
	mytree insert 0 end a b c
	lappend t ==
	mytree walk root -type $type -order $order {a n} {
	    if {[string equal $n "b"]} {lappend t . ; continue}
	    lappend t $a $n
	}
	lappend t ==
	mytree destroy
	set t
    } $log
}

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . ==}
    1 dfs post {== leave a . ==}
    2 dfs both {== enter root enter 0 enter a leave a . ==}
    3 dfs in   {== visit a visit 0 . ==}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a . ==}
    5 bfs post {== leave c . ==}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a . leave c . ==}
} {
    test tree-${impl}-4.4.15.$n "break in walk $type/$order" {
	tree mytree
	set t [list ]
	mytree insert root end 0 1 2 3
	mytree insert 0 end a b c
	lappend t ==
	mytree walk root -type $type -order $order {a n} {
	    if {[string equal $n "b"]} {lappend t . ; break}
	    lappend t $a $n
	}
	lappend t ==
	mytree destroy
	set t
    } $log
}

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . good-return}
    1 dfs post {== leave a . good-return}
    2 dfs both {== enter root enter 0 enter a leave a . good-return}
    3 dfs in   {== visit a visit 0 . good-return}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a . good-return}
    5 bfs post {== leave c . good-return}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a . leave c . good-return}
} {
    test tree-${impl}-4.4.16.$n "return in walk $type/$order" {
	set t [list ]
	proc foo {} {
	    global t type order
	    tree mytree
	    mytree insert root end 0 1 2 3
	    mytree insert 0 end a b c
	    lappend t ==
	    mytree walk root -type $type -order $order {a n} {
		if {[string equal $n "b"]} {
		    lappend t .
		    return good-return
		}
		lappend t $a $n
	    }
	    lappend t ==
	    return bad-return
	}
	lappend t [foo]
	mytree destroy
	set t
    } $log
}

if {[package vcompare [package provide Tcl] 8.3] < 0} {
    # before 8.4
    set t4417estack [viewFile tree.testsuite.4417b84.txt]

} elseif {[package vcompare [package provide Tcl] 8.4] == 0} {
    # 8.4
    switch -exact -- $impl {
	tcl {
	    set t4417estack [viewFile [localPath tree.testsuite.4417=84tcl.txt]]
	}
	critcl {
	    set t4417estack [viewFile [localPath tree.testsuite.4417a83critcl.txt]]
	}
    }
} else {
    # 8.5+
    switch -exact -- $impl {
	tcl {
	    set t4417estack [viewFile [localPath tree.testsuite.4417a84tcl.txt]]
	}
	critcl {
	    set t4417estack [viewFile [localPath tree.testsuite.4417a83critcl.txt]]
	}
    }
}

test tree-${impl}-4.4.17 {error in walk} {
    set t [list ]
    proc foo {} {
	global t
	tree mytree
	mytree insert root end 0 1 2 3
	mytree insert 0 end a b c
	lappend t ==
	mytree walk root {a n} {
	    if {[string equal $n "b"]} {
		lappend t .
		error fubar
	    }
	    lappend t $a $n
	}
	lappend t ==
	return bad-return
    }
    catch {lappend t [foo]} result
    mytree destroy
    list $t $result $::errorInfo
} [list {== enter root enter 0 enter a .} fubar $t4417estack]

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a .}
    1 dfs post {== leave a .}
    2 dfs both {== enter root enter 0 enter a leave a .}
    3 dfs in   {== visit a visit 0 .}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a .}
    5 bfs post {== leave c .}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a .}
} {
    test tree-${impl}-4.4.17.$n "error in walk $type/$order" {
	set t [list ]
	proc foo {} {
	    global t type order
	    tree mytree
	    mytree insert root end 0 1 2 3
	    mytree insert 0 end a b c
	    lappend t ==
	    mytree walk root -type $type -order $order {a n} {
		if {[string equal $n "b"]} {
		    lappend t .
		    error fubar
		}
		lappend t $a $n
	    }
	    lappend t ==
	    return bad-return
	}
	catch {lappend t [foo]} result
	mytree destroy
	list $t $result
    } [list $log fubar]
}

foreach {n prune type order log} {
    0 0 dfs pre  {enter 0 enter 1 enter 2 enter 4 enter 5 enter 6 enter 3}
    1 1 dfs pre  {enter 0 enter 1 enter 2 enter 3}
    2 0 dfs both {enter 0 enter 1 leave 1 enter 2 enter 4 leave 4 enter 5 leave 5 enter 6 leave 6 leave 2 enter 3 leave 3 leave 0}
    3 1 dfs both {enter 0 enter 1 leave 1 enter 2 leave 2 enter 3 leave 3 leave 0}
    4 0 bfs pre  {enter 0 enter 1 enter 2 enter 3 enter 4 enter 5 enter 6}
    5 1 bfs pre  {enter 0 enter 1 enter 2 enter 3}
    6 0 bfs both {enter 0 enter 1 enter 2 enter 3 enter 4 enter 5 enter 6 leave 6 leave 5 leave 4 leave 3 leave 2 leave 1 leave 0}
    7 1 bfs both {enter 0 enter 1 enter 2 enter 3 leave 3 leave 2 leave 1 leave 0}
} {
    test tree-${impl}-4.5.$n {pruning} {
	# (0 (1 2 (4 5 6) 3))
	tree mytree deserialize {0 {} {} 1 0 {} 2 0 {} 4 6 {} 5 6 {} 6 6 {} 3 0 {}}
	set t {}
	mytree walk 0 -type $type -order $order {a n} {
	    lappend t $a $n
	    if {$prune && ($n == 2)} {struct::tree::prune}
	}
	mytree destroy
	set t
    } $log ;# {}
}

foreach {n type order} {
    8  dfs post
    9  bfs post
    10 dfs in
} {
    test tree-${impl}-4.5.$n {prune errors} {
	# (0 (1 2 (4 5)))
	tree mytree deserialize {0 {} {} 1 0 {} 2 0 {} 4 6 {} 5 6 {}}
	set t {}
	catch {
	    mytree walk 0 -type $type -order $order {a n} {
		lappend t $a $n
		if {($n == 2)} {struct::tree::prune}
	    }
	} res ; # {}
	mytree destroy
	set res
    } "Illegal attempt to prune ${order}-order walking" ;# {}
}


test tree-${impl}-4.6.1 {walkproc with too few args} {badTest} {
    tree mytree
    catch {mytree walkproc} msg
    mytree destroy
    set msg
} {no value given for parameter "node" to "::struct::tree::_walkproc"}

test tree-${impl}-4.6.2 {walkproc with too few args} {
    tree mytree
    catch {mytree walkproc root} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walkproc node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? cmdprefix\""

test tree-${impl}-4.6.3 {walkproc with too many args} {
    tree mytree
    catch {mytree walkproc root -foo bar -baz boo -foo2 boo -foo3 baz -foo4 gnar -foo5 schnurr} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walkproc node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? cmdprefix\""

test tree-${impl}-4.6.4 {walkproc with fake node} {
    tree mytree
    catch {mytree walkproc {IT::EM 0} foo} msg
    mytree destroy
    set msg
} "node \"IT::EM 0\" does not exist in tree \"$MY\""

test tree-${impl}-4.6.5 {walkproc gives error on invalid search type} {
    tree mytree
    catch {mytree walkproc root -type foo foo} msg
    mytree destroy
    set msg
} {bad search type "foo": must be bfs or dfs}

test tree-${impl}-4.6.6 {walkproc gives error on invalid search order} {
    tree mytree
    catch {mytree walkproc root -order foo foo} msg
    mytree destroy
    set msg
} {bad search order "foo": must be both, in, pre, or post}

test tree-${impl}-4.6.7 {walkproc gives error on invalid combination of order and type} {
    tree mytree
    catch {mytree walkproc root -order in -type bfs foo} msg
    mytree destroy
    set msg
} {unable to do a in-order breadth first walk}

test tree-${impl}-4.6.8 {walkproc with unknown options} {
    tree mytree
    catch {mytree walkproc root -foo bar foo} msg
    mytree destroy
    set msg
} {unknown option "-foo"}

test tree-${impl}-4.6.9 {walkproc, option without value} {
    tree mytree
    catch {mytree walkproc root -type dfs -order} msg
    mytree destroy
    set msg
} {value for "-order" missing}

test tree-${impl}-4.6.10 {walkproc without command} {
    tree mytree
    catch {mytree walkproc root -order pre} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY walkproc node ?-type {bfs|dfs}? ?-order {pre|post|in|both}? ?--? cmdprefix\""

test tree-${impl}-4.6.10.1 {walkproc with empty command} {
    tree mytree
    catch {mytree walkproc root -order pre {}} msg
    mytree destroy
    set msg
} {no script specified, or empty}

test tree-${impl}-4.6.10.2 {walkproc, cmdprefix is not a list} {
    tree mytree
    catch {mytree walkproc root -order pre "\{"} msg
    mytree destroy
    set msg
} {unmatched open brace in list}

test tree-${impl}-4.6.10.3 {walkproc with unknown command} {
    tree mytree
    catch {mytree walkproc root -order pre ::bogus} msg
    mytree destroy
    set msg
} {invalid command name "::bogus"}

test tree-${impl}-4.6.11.1 {pre dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -type dfs pwalker
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

test tree-${impl}-4.6.11.2 {post dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -order post -type dfs pwalker
    mytree destroy
    set t
} [list leave {IT::EM 0.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0} \
	leave {IT::EM 1.1} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1}   \
	leave root]

test tree-${impl}-4.6.11.3 {both dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -order both -type dfs pwalker
    mytree destroy
    set t
} [list enter root \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	leave {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	leave {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1}   \
	leave root]

test tree-${impl}-4.6.11.4 {in dfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -order in -type dfs pwalker
    mytree destroy
    set t
} [list visit {IT::EM 0.1} \
	visit {IT::EM 0}   \
	visit {IT::EM 0.2} \
	visit root    \
	visit {IT::EM 1.1} \
	visit {IT::EM 1} \
	visit {IT::EM 1.2}]

test tree-${impl}-4.6.11.7 {pre dfs walk, nodes with spaces in names} {
    tree mytree
    set t [list ]
    mytree insert root end "node 0"
    mytree insert root end "node 1"
    mytree insert "node 0" end "node 0 1"
    mytree insert "node 0" end "node 0 2"
    mytree insert "node 1" end "node 1 1"
    mytree insert "node 1" end "node 1 2"
    mytree walkproc root -type dfs pwalkern
    mytree destroy
    set t
} {root {node 0} {node 0 1} {node 0 2} {node 1} {node 1 1} {node 1 2}}

test tree-${impl}-4.6.12.1 {pre bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -type bfs pwalker
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0}   \
	enter {IT::EM 1}   \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

test tree-${impl}-4.6.12.2 {post bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -type bfs -order post pwalker
    mytree destroy
    set t
} [list leave {IT::EM 1.2} \
	leave {IT::EM 1.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0.1} \
	leave {IT::EM 1}   \
	leave {IT::EM 0} \
	leave root]

test tree-${impl}-4.6.12.3 {both bfs walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root -type bfs -order both pwalker
    mytree destroy
    set t
} [list enter root    \
	enter {IT::EM 0}   \
	enter {IT::EM 1}   \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2} \
	leave {IT::EM 1.2} \
	leave {IT::EM 1.1} \
	leave {IT::EM 0.2} \
	leave {IT::EM 0.1} \
	leave {IT::EM 1}   \
	leave {IT::EM 0}   \
	leave root]

test tree-${impl}-4.6.13 {pre dfs is default walk} {
    tree mytree
    set t [list ]
    mytree insert root end {IT::EM 0}
    mytree insert root end {IT::EM 1}
    mytree insert {IT::EM 0} end {IT::EM 0.1}
    mytree insert {IT::EM 0} end {IT::EM 0.2}
    mytree insert {IT::EM 1} end {IT::EM 1.1}
    mytree insert {IT::EM 1} end {IT::EM 1.2}
    mytree walkproc root pwalker
    mytree destroy
    set t
} [list enter root \
	enter {IT::EM 0} \
	enter {IT::EM 0.1} \
	enter {IT::EM 0.2} \
	enter {IT::EM 1} \
	enter {IT::EM 1.1} \
	enter {IT::EM 1.2}]

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . enter c enter 1 enter 2 ==}
    1 dfs post {== leave a . leave c leave 0 leave 1 leave 2 leave root ==}
    2 dfs both {== enter root enter 0 enter a leave a . . enter c leave c leave 0 enter 1 leave 1 enter 2 leave 2 leave root ==}
    3 dfs in   {== visit a visit 0 . visit c visit root visit 1 visit 2 ==}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter a . enter c ==}
    5 bfs post {== leave c . leave a leave 2 leave 1 leave 0 leave root ==}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter a . enter c leave c . leave a leave 2 leave 1 leave 0 leave root ==}
} {
    test tree-${impl}-4.6.14.$n "continue in walk $type/$order" {
	tree mytree
	set t [list ]
	mytree insert root end 0 1 2
	mytree insert 0 end a b c
	lappend t ==
	mytree walkproc root -type $type -order $order pwalkercont
	lappend t ==
	mytree destroy
	set t
    } $log
}

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . ==}
    1 dfs post {== leave a . ==}
    2 dfs both {== enter root enter 0 enter a leave a . ==}
    3 dfs in   {== visit a visit 0 . ==}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a . ==}
    5 bfs post {== leave c . ==}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a . leave c . ==}
} {
    test tree-${impl}-4.6.15.$n "break in walk $type/$order" {
	tree mytree
	set t [list ]
	mytree insert root end 0 1 2 3
	mytree insert 0 end a b c
	lappend t ==
	mytree walkproc root -type $type -order $order pwalkerbreak
	lappend t ==
	mytree destroy
	set t
    } $log
}

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a . good-return}
    1 dfs post {== leave a . good-return}
    2 dfs both {== enter root enter 0 enter a leave a . good-return}
    3 dfs in   {== visit a visit 0 . good-return}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a . good-return}
    5 bfs post {== leave c . good-return}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a . leave c . good-return}
} {
    test tree-${impl}-4.6.16.$n "return in walk $type/$order" {
	set t [list ]
	proc foo {} {
	    global t type order
	    tree mytree
	    mytree insert root end 0 1 2 3
	    mytree insert 0 end a b c
	    lappend t ==
	    mytree walkproc root -type $type -order $order pwalkerret
	    lappend t ==
	    return bad-return
	}
	lappend t [foo]
	mytree destroy
	set t
    } $log
}

switch -exact -- $impl {
    tcl {
	set t4617estack {fubar
    while executing
"error fubar"
    (procedure "pwalkererr" line 4)
    invoked from within
"pwalkererr ::mytree b enter"
    ("WalkCallProc" body line 1)
    invoked from within
"WalkCallProc $name $node "enter" $script"
    (procedure "::struct::tree::_walkproc" line 79)
    invoked from within
"::struct::tree::_walkproc ::mytree root pwalkererr"
    ("_walkproc" body line 1)
    invoked from within
"mytree walkproc root pwalkererr"
    (procedure "foo" line 7)
    invoked from within
"foo"}
}
    critcl {
    set t4617estack {fubar
    while executing
"error fubar"
    (procedure "pwalkererr" line 4)
    invoked from within
"pwalkererr mytree b enter"
    invoked from within
"mytree walkproc root pwalkererr"
    (procedure "foo" line 7)
    invoked from within
"foo"}
}
}

test tree-${impl}-4.6.17 {error in walk} {
    set t [list ]
    proc foo {} {
	global t
	tree mytree
	mytree insert root end 0 1 2 3
	mytree insert 0 end a b c
	lappend t ==
	mytree walkproc root pwalkererr
	lappend t ==
	return bad-return
    }
    catch {lappend t [foo]} result
    mytree destroy
    list $t $result $::errorInfo
} [list {== enter root enter 0 enter a .} fubar $t4617estack]

foreach {n type order log} {
    0 dfs pre  {== enter root enter 0 enter a .}
    1 dfs post {== leave a .}
    2 dfs both {== enter root enter 0 enter a leave a .}
    3 dfs in   {== visit a visit 0 .}
    4 bfs pre  {== enter root enter 0 enter 1 enter 2 enter 3 enter a .}
    5 bfs post {== leave c .}
    6 bfs both {== enter root enter 0 enter 1 enter 2 enter 3 enter a .}
} {
    test tree-${impl}-4.6.17.$n "error in walk $type/$order" {
	set t [list ]
	proc foo {} {
	    global t type order
	    tree mytree
	    mytree insert root end 0 1 2 3
	    mytree insert 0 end a b c
	    lappend t ==
	    mytree walkproc root -type $type -order $order pwalkererr
	    lappend t ==
	    return bad-return
	}
	catch {lappend t [foo]} result
	mytree destroy
	list $t $result
    } [list $log fubar]
}

foreach {n prune type order log} {
    0 0 dfs pre  {enter 0 enter 1 enter 2 enter 4 enter 5 enter 6 enter 3}
    1 1 dfs pre  {enter 0 enter 1 enter 2 enter 3}
    2 0 dfs both {enter 0 enter 1 leave 1 enter 2 enter 4 leave 4 enter 5 leave 5 enter 6 leave 6 leave 2 enter 3 leave 3 leave 0}
    3 1 dfs both {enter 0 enter 1 leave 1 enter 2 leave 2 enter 3 leave 3 leave 0}
    4 0 bfs pre  {enter 0 enter 1 enter 2 enter 3 enter 4 enter 5 enter 6}
    5 1 bfs pre  {enter 0 enter 1 enter 2 enter 3}
    6 0 bfs both {enter 0 enter 1 enter 2 enter 3 enter 4 enter 5 enter 6 leave 6 leave 5 leave 4 leave 3 leave 2 leave 1 leave 0}
    7 1 bfs both {enter 0 enter 1 enter 2 enter 3 leave 3 leave 2 leave 1 leave 0}
} {
    test tree-${impl}-4.7.$n {pruning} {
	# (0 (1 2 (4 5 6) 3))
	tree mytree deserialize {0 {} {} 1 0 {} 2 0 {} 4 6 {} 5 6 {} 6 6 {} 3 0 {}}
	set t {}
	mytree walkproc 0 -type $type -order $order pwalkerprune
	mytree destroy
	set t
    } $log ;# {}
}

foreach {n type order} {
    8  dfs post
    9  bfs post
    10 dfs in
} {
    test tree-${impl}-4.7.$n {prune errors} {
	# (0 (1 2 (4 5)))
	tree mytree deserialize {0 {} {} 1 0 {} 2 0 {} 4 6 {} 5 6 {}}
	set t {}
	catch {
	    mytree walkproc 0 -type $type -order $order pwalkerpruneb
	} res ; # {}
	mytree destroy
	set res
    } "Illegal attempt to prune ${order}-order walking" ;# {}
}

############################################################
# V. Objects to values and back ...
# - serialize deserialize = -->
############################################################

############################################################

test tree-${impl}-5.1.1 {serialization, wrong #args} {
    tree mytree
    catch {mytree serialize foo bar} result
    mytree destroy
    set result
} "wrong # args: should be \"$MY serialize ?node?\""

test tree-${impl}-5.1.2 {serialization, bogus node} {
    tree mytree
    catch {mytree serialize foo} result
    mytree destroy
    set result
} "node \"foo\" does not exist in tree \"$MY\""

test tree-${impl}-5.1.3 {serialization} {
    tree mytree
    mytree insert root end %0
    mytree insert root end %1
    mytree insert root end %2
    mytree insert %0 end %3
    mytree insert %0 end %4

    set serial [mytree serialize]
    set result [validate_serial mytree $serial]
    mytree destroy
    set result
    # {{root {} %0 0 %3 2 %4 2 %1 0 %2 0} {}}
} ok

test tree-${impl}-5.1.4 {serialization} {
    tree mytree
    mytree insert root end %0
    mytree insert root end %1
    mytree insert root end %2
    mytree insert %0 end %3
    mytree insert %0 end %4
    mytree set %4 foo far

    set serial [mytree serialize %0]
    set result [validate_serial mytree $serial %0]
    mytree destroy
    set result
    # {%0 {} {} %3 0 {} %4 0 {foo far data {}}}
} ok

test tree-${impl}-5.1.5 {serialization, empty tree} {
    tree mytree
    set serial [mytree serialize]
    set result [validate_serial mytree $serial]
    mytree destroy
    set result
    # serial = {root {} {}}
} ok

############################################################

test tree-${impl}-5.2.1 {deserialization, wrong #args} {
    tree mytree
    catch {mytree deserialize foo bar} result
    mytree destroy
    set result
} [tmTooMany deserialize {serial}]

test tree-${impl}-5.2.2 {deserialization} {
    tree mytree
    set serial {. %0 {} {} %3 0 {} %4 0 {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: list length not a multiple of 3.}}

test tree-${impl}-5.2.3 {deserialization} {
    tree mytree
    set serial {%3 {} {} %4 0 {foo far . data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: malformed attribute dictionary.}}

test tree-${impl}-5.2.4 {deserialization} {
    tree mytree
    set serial {%3 -1 {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "-1".}}

test tree-${impl}-5.2.5 {deserialization} {
    tree mytree
    set serial {%3 .. {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "..".}}

test tree-${impl}-5.2.6 {deserialization} {
    tree mytree
    set serial {%3 .. {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "..".}}

test tree-${impl}-5.2.7 {deserialization} {
    tree mytree
    set serial {%3 1 {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "1".}}

test tree-${impl}-5.2.8 {deserialization} {
    tree mytree
    set serial {%3 2 {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "2".}}

test tree-${impl}-5.2.9 {deserialization} {
    tree mytree
    set serial {%3 8 {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "8".}}

test tree-${impl}-5.2.10 {deserialization} {
    tree mytree
    set serial {%3 6 {} %4 {} {foo far data {}}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: bad parent reference "6".}}

test tree-${impl}-5.2.11 {deserialization} {
    tree mytree
    set serial {%3 3 {} %4 0 {}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: no root specified.}}

test tree-${impl}-5.2.12 {deserialization} {
    tree mytree
    set serial {%3 {} {} %4 {} {} %x 0 {}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: multiple root nodes.}}

test tree-${impl}-5.2.13 {deserialization} {
    tree mytree
    set serial {%3 3 {} %3 {} {} %x 0 {}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: duplicate node names.}}

test tree-${impl}-5.2.14 {deserialization} {
    tree mytree
    set serial {%3 0 {} %4 {} {} %x 0 {}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: cycle detected.}}

test tree-${impl}-5.2.15 {deserialization} {
    tree mytree
    set serial {%3 3 {} %4 0 {} %x {} {}}
    set fail [catch {mytree deserialize $serial} result]
    mytree destroy
    list $fail $result
} {1 {error in serialization: cycle detected.}}

test tree-${impl}-5.2.16 {deserialization} {
    tree mytree

    # Our check of the success of the deserialization
    # is to validate the generated tree against the
    # serialized data.

    set serial {%0 {} {} %3 0 {} %4 0 {foo far data {}}}

    set     result [list]
    lappend result [validate_serial mytree $serial]

    mytree deserialize $serial
    lappend result [validate_serial mytree $serial]
    lappend result [mytree rootname]

    mytree destroy
    set result
} {node/%0/unknown ok %0}

test tree-${impl}-5.2.17 {deserialization} {
    tree mytree

    # Our check of the success of the deserialization
    # is to validate the generated tree against the
    # serialized data.

    # Applying to serialization one after the
    # other. Checking that the second operation
    # completely squashes the data from the first.

    set seriala {root {} {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}
    set serialb {%0 {} {} %3 0 {} %4 0 {foo far data {}}}

    set     result [list]
    lappend result [validate_serial mytree $seriala]
    lappend result [validate_serial mytree $serialb]
    lappend result [mytree rootname]

    mytree deserialize $seriala
    lappend result [validate_serial mytree $seriala]
    lappend result [validate_serial mytree $serialb]
    lappend result [mytree rootname]

    mytree deserialize $serialb
    lappend result [validate_serial mytree $seriala]
    lappend result [validate_serial mytree $serialb]
    lappend result [mytree rootname]

    mytree destroy
    set result
} [list node/%0/unknown node/%0/unknown root \
	ok attr/%4/mismatch root \
	node/root/unknown ok %0]

test tree-${impl}-5.2.18 {deserialization, empty tree} {
    tree mytree
    set serial {root {} {}}
    mytree deserialize $serial
    set result [validate_serial mytree $serial]
    mytree destroy
    set result
} ok

test tree-${impl}-5.2.19 {deserialization, not a list} {
    tree mytree
    catch {mytree deserialize "\{"} result
    mytree destroy
    set result
} {unmatched open brace in list}

############################################################

test tree-${impl}-5.3.1 {tree assignment} {
    tree mytree
    catch {mytree = foo bar} result
    mytree destroy
    set result
} [tmTooMany = {source}]

test tree-${impl}-5.3.2 {tree assignment} {
    set serial {root {} {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}

    tree mytree
    tree btree

    mytree deserialize $serial

    set result [validate_serial btree $serial]
    btree = mytree
    lappend result [validate_serial btree $serial]

    mytree destroy
    btree  destroy
    set result
} {node/%0/unknown ok}

test tree-${impl}-5.3.3 {tree assignment, bogus cmd} {
    tree mytree
    catch {mytree = "\{"} result
    mytree destroy
    set result
} "invalid command name \"\{\""

test tree-${impl}-5.3.4 {tree assignment, unknown command} {
    tree mytree
    catch {mytree = ::bogus} result
    mytree destroy
    set result
} {invalid command name "::bogus"}

############################################################

test tree-${impl}-5.4.1 {reverse tree assignment} {
    tree mytree
    catch {mytree --> foo bar} result
    mytree destroy
    set result
} [tmTooMany --> {dest}]

test tree-${impl}-5.4.2 {reverse tree assignment} {

    set serial {root {} {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}

    tree mytree
    tree btree

    mytree deserialize $serial

    set result [validate_serial btree $serial]
    mytree --> btree
    lappend result [validate_serial btree $serial]

    mytree destroy
    btree  destroy
    set result
} {node/%0/unknown ok}

test tree-${impl}-5.4.3 {reverse tree assignment, bogus cmd} {
    tree mytree
    catch {mytree --> "\{"} result
    mytree destroy
    set result
} "invalid command name \"\{\""

test tree-${impl}-5.4.4 {reverse tree assignment, unknown command} {
    tree mytree
    catch {mytree --> ::bogus} result
    mytree destroy
    set result
} {invalid command name "::bogus"}

############################################################

test tree-${impl}-5.5.1 {copy construction, wrong # args} {
    catch {tree mytree = a b} result
    set result
} {wrong # args: should be "tree ?name ?=|:=|as|deserialize source??"}

test tree-${impl}-5.5.2 {copy construction, unknown operator} {
    catch {tree mytree foo a} result
    set result
} {wrong # args: should be "tree ?name ?=|:=|as|deserialize source??"}

test tree-${impl}-5.5.3 {copy construction, value} {
    set serial {root {} {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}

    tree mytree deserialize $serial
    set result [validate_serial mytree $serial]
    mytree destroy

    set result
} ok

test tree-${impl}-5.5.4 {copy construction, tree} {
    set serial {root {} {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}

    tree mytree deserialize $serial
    tree btree = mytree

    set result [validate_serial btree $serial]
    mytree destroy
    btree  destroy

    set result
} ok

test tree-${impl}-5.5.5 {copy construction, unknown command} {
    catch {tree mytree = ::bogus} msg
    catch {mytree destroy}        res
    list $msg $res
} {{invalid command name "::bogus"} {invalid command name "mytree"}}

test tree-${impl}-5.5.6 {copy construction, bad value} {
    set serial {root 6 {} %0 0 {} %3 3 {} %4 3 {} %1 0 {} %2 0 {}}

    catch {tree mytree deserialize $serial} msg
    catch {mytree destroy}                  res
    list $msg $res
} {{error in serialization: no root specified.} {invalid command name "mytree"}}

############################################################

proc gentree {t} {
    tree $t
    $t insert root end 0 ; $t set 0 volume 30
    $t insert root end 1
    $t insert root end 2
    $t insert 0    end 3
    $t insert 0    end 4
    $t insert 4    end 5 ; $t set 5 volume 50
    $t insert 4    end 6
}

test tree-${impl}-6.0 {attribute search} {
    gentree mytree
    catch {mytree attr} msg
    mytree destroy
    set msg
} [tmWrong attr {key ?-nodes list|-glob pattern|-regexp pattern?} 0 {key args}]

test tree-${impl}-6.1 {attribute search} {
    gentree mytree
    catch {mytree attr a b} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY attr key ?-nodes list|-glob pattern|-regexp pattern?\""

test tree-${impl}-6.2 {attribute search} {
    gentree mytree
    catch {mytree attr a b c d} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY attr key ?-nodes list|-glob pattern|-regexp pattern?\""

test tree-${impl}-6.3 {attribute search} {
    gentree mytree
    catch {mytree attr a b c} msg
    mytree destroy
    set msg
} "wrong # args: should be \"$MY attr key ?-nodes list|-glob pattern|-regexp pattern?\""

test tree-${impl}-6.4 {attribute search} {
    gentree mytree
    set result [mytree attr vol]
    mytree destroy
    set result
} {}

test tree-${impl}-6.5 {attribute search} {
    gentree mytree
    set result [dictsort [mytree attr volume]]
    mytree destroy
    set result
} {0 30 5 50}

test tree-${impl}-6.6 {attribute search} {
    gentree mytree
    set result [mytree attr volume -nodes {0 3}]
    mytree destroy
    set result
} {0 30}

test tree-${impl}-6.7 {attribute search} {
    gentree mytree
    set result [mytree attr volume -glob {[0-3]}]
    mytree destroy
    set result
} {0 30}

test tree-${impl}-6.8 {attribute search} {
    gentree mytree
    set result [mytree attr volume -regexp {[0-3]}]
    mytree destroy
    set result
} {0 30}

test tree-${impl}-6.9 {attribute search} {
    gentree mytree
    set result [mytree attr volume -nodes {}]
    mytree destroy
    set result
} {}

test tree-${impl}-6.10 {attribute search} {
    gentree mytree
    mytree unset 0 volume
    mytree unset 5 volume
    set result [mytree attr volume]
    mytree destroy
    set result
} {}

test tree-${impl}-6.11 {attribute search, duplicates} {
    gentree mytree
    set result [mytree attr volume -nodes {0 3 0}]
    mytree destroy
    set result
} {0 30 0 30}

test tree-${impl}-6.12 {attribute search, duplicates beyond tree size} {
    gentree mytree
    set result [mytree attr volume -nodes {0 3 0 5 0 5 0 5 0 5 0 5}]
    mytree destroy
    set result
} {0 30 0 30 5 50 0 30 5 50 0 30 5 50 0 30 5 50 0 30 5 50}

############################################################

# deserialization, and the creation of new nodes with automatic names.

test tree-${impl}-7.0 {deserialization & automatic node names} {
    tree mytree
    mytree deserialize {root {} {} node1 0 {}}
    mytree insert root end
    set result [lsort [mytree nodes]]
    mytree destroy
    set result
} {node1 node2 root}