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+# Commands covered:  append lappend
+#
+# 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) 1991-1993 The Regents of the University of California.
+# Copyright (c) 1994-1996 Sun Microsystems, Inc.
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+# SCCS: @(#) append.test 1.17 97/10/28 15:45:52
+
+if {[string compare test [info procs test]] == 1} then {source defs}
+
+catch {unset x}
+test append-1.1 {append command} {
+    catch {unset x}
+    list [append x 1 2 abc "long string"] $x
+} {{12abclong string} {12abclong string}}
+test append-1.2 {append command} {
+    set x ""
+    list [append x first] [append x second] [append x third] $x
+} {first firstsecond firstsecondthird firstsecondthird}
+test append-1.3 {append command} {
+    set x "abcd"
+    append x
+} abcd
+
+test append-2.1 {long appends} {
+    set x ""
+    for {set i 0} {$i < 1000} {set i [expr $i+1]} {
+	append x "foobar "
+    }
+    set y "foobar"
+    set y "$y $y $y $y $y $y $y $y $y $y"
+    set y "$y $y $y $y $y $y $y $y $y $y"
+    set y "$y $y $y $y $y $y $y $y $y $y "
+    expr {$x == $y}
+} 1
+
+test append-3.1 {append errors} {
+    list [catch {append} msg] $msg
+} {1 {wrong # args: should be "append varName ?value value ...?"}}
+test append-3.2 {append errors} {
+    set x ""
+    list [catch {append x(0) 44} msg] $msg
+} {1 {can't set "x(0)": variable isn't array}}
+test append-3.3 {append errors} {
+    catch {unset x}
+    list [catch {append x} msg] $msg
+} {1 {can't read "x": no such variable}}
+
+test append-4.1 {lappend command} {
+    catch {unset x}
+    list [lappend x 1 2 abc "long string"] $x
+} {{1 2 abc {long string}} {1 2 abc {long string}}}
+test append-4.2 {lappend command} {
+    set x ""
+    list [lappend x first] [lappend x second] [lappend x third] $x
+} {first {first second} {first second third} {first second third}}
+test append-4.3 {lappend command} {
+    proc foo {} {
+	global x
+	set x old
+	unset x
+	lappend x new
+    }
+    set result [foo]
+    rename foo {}
+    set result
+} {new}
+test append-4.4 {lappend command} {
+    set x {}
+    lappend x \{\  abc
+} {\{\  abc}
+test append-4.5 {lappend command} {
+    set x {}
+    lappend x \{ abc
+} {\{ abc}
+test append-4.6 {lappend command} {
+    set x {1 2 3}
+    lappend x
+} {1 2 3}
+test append-4.7 {lappend command} {
+    set x "a\{"
+    lappend x abc
+} "a\\\{ abc"
+test append-4.8 {lappend command} {
+    set x "\\\{"
+    lappend x abc
+} "\\{ abc"
+test append-4.9 {lappend command} {
+    set x " \{"
+    list [catch {lappend x abc} msg] $msg
+} {1 {unmatched open brace in list}}
+test append-4.10 {lappend command} {
+    set x "	\{"
+    list [catch {lappend x abc} msg] $msg
+} {1 {unmatched open brace in list}}
+test append-4.11 {lappend command} {
+    set x "\{\{\{"
+    list [catch {lappend x abc} msg] $msg
+} {1 {unmatched open brace in list}}
+test append-4.12 {lappend command} {
+    set x "x \{\{\{"
+    list [catch {lappend x abc} msg] $msg
+} {1 {unmatched open brace in list}}
+test append-4.13 {lappend command} {
+    set x "x\{\{\{"
+    lappend x abc
+} "x\\\{\\\{\\\{ abc"
+test append-4.14 {lappend command} {
+    set x " "
+    lappend x abc
+} "abc"
+test append-4.15 {lappend command} {
+    set x "\\ "
+    lappend x abc
+} "{ } abc"
+test append-4.16 {lappend command} {
+    set x "x "
+    lappend x abc
+} "x abc"
+test append-4.17 {lappend command} {
+    catch {unset x}
+    lappend x
+} {}
+
+proc check {var size} {
+    set l [llength $var]
+    if {$l != $size} {
+	return "length mismatch: should have been $size, was $l"
+    }
+    for {set i 0} {$i < $size} {set i [expr $i+1]} {
+	set j [lindex $var $i]
+	if {$j != "item $i"} {
+	    return "element $i should have been \"item $i\", was \"$j\""
+	}
+    }
+    return ok
+}
+test append-5.1 {long lappends} {
+    set x ""
+    for {set i 0} {$i < 300} {set i [expr $i+1]} {
+	lappend x "item $i"
+    }
+    check $x 300
+} ok
+
+test append-6.1 {lappend errors} {
+    list [catch {lappend} msg] $msg
+} {1 {wrong # args: should be "lappend varName ?value value ...?"}}
+test append-6.2 {lappend errors} {
+    set x ""
+    list [catch {lappend x(0) 44} msg] $msg
+} {1 {can't set "x(0)": variable isn't array}}
+
+test append-7.1 {lappend-created var and error in trace on that var} {
+    catch {rename foo ""}
+    catch {unset x}
+    trace variable x w foo
+    proc foo {} {global x; unset x}
+    catch {lappend x 1}
+    proc foo {args} {global x; unset x}
+    info exists x
+    set x
+    lappend x 1
+    list [info exists x] [catch {set x} msg] $msg
+} {0 1 {can't read "x": no such variable}}
+
+catch {unset x}
+catch {rename foo ""}