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+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#
+# A suite of tests for bash word expansions
+#
+# This tests parameter and variable expansion, with an empahsis on
+# proper quoting behavior.
+#
+# Chet Ramey
+
+#
+# If you comment out the body of this function, you can do a diff against
+# `expansion-tests.right' to see if the shell is behaving correctly
+#
+expect()
+{
+	echo expect "$@"
+}
+
+# Test the substitution quoting characters (CTLESC and CTLNUL) in different
+# combinations
+
+expect "<^A>"
+recho `echo ''`
+expect "<^A>"
+recho `echo ""`
+expect "<^?>"
+recho `echo ''`
+expect "<^?>"
+recho `echo ""`
+expect "<^A>"
+recho `echo `
+expect "<^?>"
+recho `echo `
+
+expect "bar"
+recho ${foo:-"`echo bar`"}
+expect "<^A>"
+recho ${foo:-"`echo `"}
+expect "<^?>"
+recho ${foo:-"`echo `"}
+
+expect "<^A>"
+recho "`echo `"
+expect "<^?>"
+recho "`echo `"
+
+# Test null strings without variable expansion
+expect "<abcdefgh>"
+recho abcd""efgh
+expect "<abcdefgh>"
+recho abcd''efgh
+expect "<abcdefgh>"
+recho ""abcdefgh
+expect "<abcdefgh>"
+recho ''abcdefgh
+expect "<abcd>"
+recho abcd""
+expect "<abcd>"
+recho abcd''
+
+# Test the quirky behavior of $@ in ""
+expect nothing
+recho "$@"
+expect "< >"
+recho " $@"
+expect "<-->"
+recho "-${@}-"
+
+# Test null strings with variable expansion that fails
+expect '<>'
+recho $xxx""
+expect '<>'
+recho ""$xxx
+expect '<>'
+recho $xxx''
+expect '<>'
+recho ''$xxx
+expect '<>'
+recho $xxx""$yyy
+expect '<>'
+recho $xxx''$yyy
+
+# Test null strings with variable expansion that succeeds
+xxx=abc
+yyy=def
+
+expect '<abc>'
+recho $xxx""
+expect '<abc>'
+recho ""$xxx
+expect '<abc>'
+recho $xxx''
+expect '<abc>'
+recho ''$xxx
+expect '<abcdef>'
+recho $xxx""$yyy
+expect '<abcdef>'
+recho $xxx''$yyy
+
+unset xxx yyy
+
+# Test the unquoted special quoting characters
+expect "<^A>"
+recho 
+expect "<^?>"
+recho 
+expect "<^A>"
+recho ""
+expect "<^?>"
+recho ""
+expect "<^A>"
+recho ''
+expect "<^?>"
+recho ''
+
+# Test expansion of a variable that is unset
+expect nothing
+recho $xxx
+expect '<>'
+recho "$xxx"
+
+expect nothing
+recho "$xxx${@}"
+
+# Test empty string expansion
+expect '<>'
+recho ""
+expect '<>'
+recho ''
+
+# Test command substitution with (disabled) history substitution
+expect '<Hello World!>'
+# set +H
+recho "`echo \"Hello world!\"`"
+
+# Test some shell special characters
+expect '<`>'
+recho "\`"
+expect '<">'
+recho "\""
+expect '<\^A>'
+recho "\"
+
+expect '<\$>'
+recho "\\$"
+
+expect '<\\>'
+recho "\\\\"
+
+# This should give argv[1] = a argv[2] = b
+expect '<a> <b>'
+FOO=`echo 'a b' | tr ' ' '\012'`
+recho $FOO
+
+# This should give argv[1] = ^A argv[2] = ^?
+expect '<^A> <^?>'
+FOO=`echo ' ' | tr ' ' '\012'`
+recho $FOO
+
+# Test quoted and unquoted globbing characters
+expect '<**>'
+recho "*"*
+
+expect '<\.\./*/>'
+recho "\.\./*/"
+
+# Test patterns that come up when the shell quotes funny character
+# combinations
+expect '<^A^?^A^?>'
+recho ''
+expect '<^A^A>'
+recho ''
+expect '<^A^?>'
+recho ''
+expect '<^A^A^?>'
+recho ''
+
+# More tests of "$@"
+set abc def ghi jkl
+expect '<  abc> <def> <ghi> <jkl  >'
+recho "  $@  "
+expect '<  abc> <def> <ghi> <jkl  >'
+recho "${1+  $@  }"
+
+set abc def ghi jkl
+expect '<--abc> <def> <ghi> <jkl-->'
+recho "--$@--"
+
+set "a b" cd ef gh
+expect '<a b> <cd> <ef> <gh>'
+recho ${1+"$@"}
+expect '<a b> <cd> <ef> <gh>'
+recho ${foo:-"$@"}
+expect '<a b> <cd> <ef> <gh>'
+recho "${@}"
+
+expect '<  >'
+recho "  "
+expect '< - >'
+recho " - "
+
+# Test combinations of different types of quoting in a fully-quoted string
+# (so the WHOLLY_QUOTED tests fail and it doesn't get set)
+expect '</^root:/{s/^[^:]*:[^:]*:\([^:]*\).*$/\1/>'
+recho "/^root:/{s/^[^:]*:[^:]*:\([^:]*\).*"'$'"/\1/"
+
+# Test the various Posix parameter expansions
+
+expect '<foo bar>'
+recho "${x:-$(echo "foo bar")}"
+expect '<foo> <bar>'
+recho ${x:-$(echo "foo bar")}
+
+unset X
+expect '<abc>'
+recho ${X:=abc}
+expect '<abc>'
+recho $X
+
+set a b c
+expect '<posix>'
+recho ${3:+posix}
+
+POSIX=/usr/posix
+expect '<10>'
+recho ${#POSIX}
+
+# remove shortest trailing match
+x=file.c
+expect '<file.o>'
+recho ${x%.c}.o
+
+# remove longest trailing match
+x=posix/src/std
+expect '<posix>'
+recho ${x%%/*}
+
+# remove shortest leading pattern
+x=$HOME/src/cmd
+expect '</src/cmd>'
+recho ${x#$HOME}
+
+# remove longest leading pattern
+x=/one/two/three
+expect '<three>'
+recho ${x##*/}
+
+# pattern removal of patterns that don't match
+z=abcdef
+
+expect '<abcdef>'
+recho ${z#xyz}
+expect '<abcdef>'
+recho ${z##xyz}
+
+expect '<abcdef>'
+recho ${z%xyz}
+expect '<abcdef>'
+recho ${z%%xyz}
+
+# Command substitution and the quirky differences between `` and $()
+
+expect '<\$x>'
+recho '\$x'
+
+expect '<$x>'
+recho `echo '\$x'`
+
+expect '<\$x>'
+recho $(echo '\$x')
+
+# The difference between $* "$*" and "$@"
+
+set "abc" "def ghi" "jkl"
+
+expect '<abc> <def> <ghi> <jkl>'
+recho $*
+
+expect '<abc def ghi jkl>'
+recho "$*"
+
+OIFS="$IFS"
+IFS=":$IFS"
+
+# The special behavior of "$*", using the first character of $IFS as separator
+expect '<abc:def ghi:jkl>'
+recho "$*"
+
+IFS="$OIFS"
+
+expect '<abc> <def ghi> <jkl>'
+recho "$@"
+
+expect '<xxabc> <def ghi> <jklyy>'
+recho "xx$@yy"
+
+expect '<abc> <def ghi> <jklabc> <def ghi> <jkl>'
+recho "$@$@"
+
+foo=abc
+bar=def
+
+expect '<abcdef>'
+recho "$foo""$bar"
+
+unset foo
+set $foo bar '' xyz "$foo" abc
+
+expect '<bar> <> <xyz> <> <abc>'
+recho "$@"
+
+# More tests of quoting and deferred evaluation
+
+foo=10 x=foo
+y='$'$x
+expect '<$foo>'
+recho $y
+eval y='$'$x
+expect '<10>'
+recho $y
+
+# case statements
+
+NL='
+'
+x='ab
+cd'
+
+expect '<newline expected>'
+case "$x" in
+*$NL*)	recho "newline expected" ;;
+esac
+
+expect '<got it>'
+case \? in
+*"?"*) recho "got it" ;;
+esac
+
+expect '<got it>'
+case \? in
+*\?*) recho "got it" ;;
+esac
+
+set one two three four five
+expect '<one> <three> <five>'
+recho $1 $3 ${5} $8 ${9}
+
+# length tests on positional parameters and some special parameters
+
+expect '<5> <5>'
+recho $# ${#}
+expect '<3>'
+recho ${#1}
+expect '<1>'
+recho ${##}
+expect '<1>'
+recho ${#?}
+expect '<5>'
+recho ${#@}
+expect '<5>'
+recho ${#*}
+expect '<5>'
+recho "${#@}"
+expect '<5>'
+recho "${#*}"
+
+expect '<42>'
+recho $((28 + 14))
+expect '<26>'
+recho $[ 13 * 2 ]
+
+expect '<\>'
+recho `echo \\\\`
+
+expect '<~>'
+recho '~'
+
+expect nothing
+recho $!
+expect nothing
+recho ${!}
+
+# test word splitting of assignment statements not preceding a command
+a="a b c d e"
+declare b=$a
+expect '<a> <b> <c> <d> <e>'
+recho $b
+
+a="a?b?c"
+
+echo ${a//\\?/ }
+
+echo ${a//\?/ }
+
+${THIS_SH} -c 'var=a:b: ; IFS=" :" ; recho $var""' bash
+
+${THIS_SH} ./exp1.sub
+
+${THIS_SH} ./exp2.sub
+
+${THIS_SH} ./exp3.sub
+
+${THIS_SH} ./exp4.sub
+
+${THIS_SH} ./exp5.sub
+
+${THIS_SH} ./exp6.sub
+${THIS_SH} ./exp7.sub
+${THIS_SH} ./exp8.sub
+${THIS_SH} ./exp9.sub
+${THIS_SH} ./exp10.sub
+${THIS_SH} ./exp11.sub
+${THIS_SH} ./exp12.sub