Copy test framework from Git

Git uses a simple and yet powerful test framework, written in shell.
The framework is easy to use for both users and developers so I think
it would help if it is used in notmuch as well.

This is a copy of Git's test framework from commit
b6b0afdc30e066788592ca07c9a6c6936c68cc11 in git repository.

Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz>

1 files changed, 832 insertions, 0 deletions

diff --git a/test/test-lib.sh b/test/test-lib.sh
new file mode 100644
index 0000000..7422bba
--- /dev/null
+++ b/test/test-lib.sh
@@ -0,0 +1,832 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+# 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 2 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/ .
+
+# if --tee was passed, write the output not only to the terminal, but
+# additionally to the file test-results/$BASENAME.out, too.
+case "$GIT_TEST_TEE_STARTED, $* " in
+done,*)
+	# do not redirect again
+	;;
+*' --tee '*|*' --va'*)
+	mkdir -p test-results
+	BASE=test-results/$(basename "$0" .sh)
+	(GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
+	 echo $? > $BASE.exit) | tee $BASE.out
+	test "$(cat $BASE.exit)" = 0
+	exit
+	;;
+esac
+
+# Keep the original TERM for say_color
+ORIGINAL_TERM=$TERM
+
+# For repeatability, reset the environment to known value.
+LANG=C
+LC_ALL=C
+PAGER=cat
+TZ=UTC
+TERM=dumb
+export LANG LC_ALL PAGER TERM TZ
+EDITOR=:
+unset VISUAL
+unset GIT_EDITOR
+unset AUTHOR_DATE
+unset AUTHOR_EMAIL
+unset AUTHOR_NAME
+unset COMMIT_AUTHOR_EMAIL
+unset COMMIT_AUTHOR_NAME
+unset EMAIL
+unset GIT_ALTERNATE_OBJECT_DIRECTORIES
+unset GIT_AUTHOR_DATE
+GIT_AUTHOR_EMAIL=author@example.com
+GIT_AUTHOR_NAME='A U Thor'
+unset GIT_COMMITTER_DATE
+GIT_COMMITTER_EMAIL=committer@example.com
+GIT_COMMITTER_NAME='C O Mitter'
+unset GIT_DIFF_OPTS
+unset GIT_DIR
+unset GIT_WORK_TREE
+unset GIT_EXTERNAL_DIFF
+unset GIT_INDEX_FILE
+unset GIT_OBJECT_DIRECTORY
+unset GIT_CEILING_DIRECTORIES
+unset SHA1_FILE_DIRECTORIES
+unset SHA1_FILE_DIRECTORY
+unset GIT_NOTES_REF
+unset GIT_NOTES_DISPLAY_REF
+unset GIT_NOTES_REWRITE_REF
+unset GIT_NOTES_REWRITE_MODE
+GIT_MERGE_VERBOSITY=5
+export GIT_MERGE_VERBOSITY
+export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
+export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
+export EDITOR
+GIT_TEST_CMP=${GIT_TEST_CMP:-diff -u}
+
+# Protect ourselves from common misconfiguration to export
+# CDPATH into the environment
+unset CDPATH
+
+unset GREP_OPTIONS
+
+case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
+	1|2|true)
+		echo "* warning: Some tests will not work if GIT_TRACE" \
+			"is set as to trace on STDERR ! *"
+		echo "* warning: Please set GIT_TRACE to something" \
+			"other than 1, 2 or true ! *"
+		;;
+esac
+
+# Convenience
+#
+# A regexp to match 5 and 40 hexdigits
+_x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
+_x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
+
+# Each test should start with something like this, after copyright notices:
+#
+# test_description='Description of this test...
+# This test checks if command xyzzy does the right thing...
+# '
+# . ./test-lib.sh
+[ "x$ORIGINAL_TERM" != "xdumb" ] && (
+		TERM=$ORIGINAL_TERM &&
+		export TERM &&
+		[ -t 1 ] &&
+		tput bold >/dev/null 2>&1 &&
+		tput setaf 1 >/dev/null 2>&1 &&
+		tput sgr0 >/dev/null 2>&1
+	) &&
+	color=t
+
+while test "$#" -ne 0
+do
+	case "$1" in
+	-d|--d|--de|--deb|--debu|--debug)
+		debug=t; shift ;;
+	-i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
+		immediate=t; shift ;;
+	-l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
+		GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
+	-h|--h|--he|--hel|--help)
+		help=t; shift ;;
+	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
+		verbose=t; shift ;;
+	-q|--q|--qu|--qui|--quie|--quiet)
+		quiet=t; shift ;;
+	--with-dashes)
+		with_dashes=t; shift ;;
+	--no-color)
+		color=; shift ;;
+	--no-python)
+		# noop now...
+		shift ;;
+	--va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
+		valgrind=t; verbose=t; shift ;;
+	--tee)
+		shift ;; # was handled already
+	--root=*)
+		root=$(expr "z$1" : 'z[^=]*=\(.*\)')
+		shift ;;
+	*)
+		echo "error: unknown test option '$1'" >&2; exit 1 ;;
+	esac
+done
+
+if test -n "$color"; then
+	say_color () {
+		(
+		TERM=$ORIGINAL_TERM
+		export TERM
+		case "$1" in
+			error) tput bold; tput setaf 1;; # bold red
+			skip)  tput bold; tput setaf 2;; # bold green
+			pass)  tput setaf 2;;            # green
+			info)  tput setaf 3;;            # brown
+			*) test -n "$quiet" && return;;
+		esac
+		shift
+		printf "* %s" "$*"
+		tput sgr0
+		echo
+		)
+	}
+else
+	say_color() {
+		test -z "$1" && test -n "$quiet" && return
+		shift
+		echo "* $*"
+	}
+fi
+
+error () {
+	say_color error "error: $*"
+	GIT_EXIT_OK=t
+	exit 1
+}
+
+say () {
+	say_color info "$*"
+}
+
+test "${test_description}" != "" ||
+error "Test script did not set test_description."
+
+if test "$help" = "t"
+then
+	echo "$test_description"
+	exit 0
+fi
+
+exec 5>&1
+if test "$verbose" = "t"
+then
+	exec 4>&2 3>&1
+else
+	exec 4>/dev/null 3>/dev/null
+fi
+
+test_failure=0
+test_count=0
+test_fixed=0
+test_broken=0
+test_success=0
+
+die () {
+	code=$?
+	if test -n "$GIT_EXIT_OK"
+	then
+		exit $code
+	else
+		echo >&5 "FATAL: Unexpected exit with code $code"
+		exit 1
+	fi
+}
+
+GIT_EXIT_OK=
+trap 'die' EXIT
+
+# The semantics of the editor variables are that of invoking
+# sh -c "$EDITOR \"$@\"" files ...
+#
+# If our trash directory contains shell metacharacters, they will be
+# interpreted if we just set $EDITOR directly, so do a little dance with
+# environment variables to work around this.
+#
+# In particular, quoting isn't enough, as the path may contain the same quote
+# that we're using.
+test_set_editor () {
+	FAKE_EDITOR="$1"
+	export FAKE_EDITOR
+	EDITOR='"$FAKE_EDITOR"'
+	export EDITOR
+}
+
+test_decode_color () {
+	sed	-e 's/.\[1m/<WHITE>/g' \
+		-e 's/.\[31m/<RED>/g' \
+		-e 's/.\[32m/<GREEN>/g' \
+		-e 's/.\[33m/<YELLOW>/g' \
+		-e 's/.\[34m/<BLUE>/g' \
+		-e 's/.\[35m/<MAGENTA>/g' \
+		-e 's/.\[36m/<CYAN>/g' \
+		-e 's/.\[m/<RESET>/g'
+}
+
+q_to_nul () {
+	perl -pe 'y/Q/\000/'
+}
+
+q_to_cr () {
+	tr Q '\015'
+}
+
+append_cr () {
+	sed -e 's/$/Q/' | tr Q '\015'
+}
+
+remove_cr () {
+	tr '\015' Q | sed -e 's/Q$//'
+}
+
+test_tick () {
+	if test -z "${test_tick+set}"
+	then
+		test_tick=1112911993
+	else
+		test_tick=$(($test_tick + 60))
+	fi
+	GIT_COMMITTER_DATE="$test_tick -0700"
+	GIT_AUTHOR_DATE="$test_tick -0700"
+	export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
+}
+
+# Call test_commit with the arguments "<message> [<file> [<contents>]]"
+#
+# This will commit a file with the given contents and the given commit
+# message.  It will also add a tag with <message> as name.
+#
+# Both <file> and <contents> default to <message>.
+
+test_commit () {
+	file=${2:-"$1.t"}
+	echo "${3-$1}" > "$file" &&
+	git add "$file" &&
+	test_tick &&
+	git commit -m "$1" &&
+	git tag "$1"
+}
+
+# Call test_merge with the arguments "<message> <commit>", where <commit>
+# can be a tag pointing to the commit-to-merge.
+
+test_merge () {
+	test_tick &&
+	git merge -m "$1" "$2" &&
+	git tag "$1"
+}
+
+# This function helps systems where core.filemode=false is set.
+# Use it instead of plain 'chmod +x' to set or unset the executable bit
+# of a file in the working directory and add it to the index.
+
+test_chmod () {
+	chmod "$@" &&
+	git update-index --add "--chmod=$@"
+}
+
+# Use test_set_prereq to tell that a particular prerequisite is available.
+# The prerequisite can later be checked for in two ways:
+#
+# - Explicitly using test_have_prereq.
+#
+# - Implicitly by specifying the prerequisite tag in the calls to
+#   test_expect_{success,failure,code}.
+#
+# The single parameter is the prerequisite tag (a simple word, in all
+# capital letters by convention).
+
+test_set_prereq () {
+	satisfied="$satisfied$1 "
+}
+satisfied=" "
+
+test_have_prereq () {
+	case $satisfied in
+	*" $1 "*)
+		: yes, have it ;;
+	*)
+		! : nope ;;
+	esac
+}
+
+# You are not expected to call test_ok_ and test_failure_ directly, use
+# the text_expect_* functions instead.
+
+test_ok_ () {
+	test_success=$(($test_success + 1))
+	say_color "" "  ok $test_count: $@"
+}
+
+test_failure_ () {
+	test_failure=$(($test_failure + 1))
+	say_color error "FAIL $test_count: $1"
+	shift
+	echo "$@" | sed -e 's/^/	/'
+	test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
+}
+
+test_known_broken_ok_ () {
+	test_fixed=$(($test_fixed+1))
+	say_color "" "  FIXED $test_count: $@"
+}
+
+test_known_broken_failure_ () {
+	test_broken=$(($test_broken+1))
+	say_color skip "  still broken $test_count: $@"
+}
+
+test_debug () {
+	test "$debug" = "" || eval "$1"
+}
+
+test_run_ () {
+	test_cleanup=:
+	eval >&3 2>&4 "$1"
+	eval_ret=$?
+	eval >&3 2>&4 "$test_cleanup"
+	return 0
+}
+
+test_skip () {
+	test_count=$(($test_count+1))
+	to_skip=
+	for skp in $GIT_SKIP_TESTS
+	do
+		case $this_test.$test_count in
+		$skp)
+			to_skip=t
+		esac
+	done
+	if test -z "$to_skip" && test -n "$prereq" &&
+	   ! test_have_prereq "$prereq"
+	then
+		to_skip=t
+	fi
+	case "$to_skip" in
+	t)
+		say_color skip >&3 "skipping test: $@"
+		say_color skip "skip $test_count: $1"
+		: true
+		;;
+	*)
+		false
+		;;
+	esac
+}
+
+test_expect_failure () {
+	test "$#" = 3 && { prereq=$1; shift; } || prereq=
+	test "$#" = 2 ||
+	error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
+	if ! test_skip "$@"
+	then
+		say >&3 "checking known breakage: $2"
+		test_run_ "$2"
+		if [ "$?" = 0 -a "$eval_ret" = 0 ]
+		then
+			test_known_broken_ok_ "$1"
+		else
+			test_known_broken_failure_ "$1"
+		fi
+	fi
+	echo >&3 ""
+}
+
+test_expect_success () {
+	test "$#" = 3 && { prereq=$1; shift; } || prereq=
+	test "$#" = 2 ||
+	error "bug in the test script: not 2 or 3 parameters to test-expect-success"
+	if ! test_skip "$@"
+	then
+		say >&3 "expecting success: $2"
+		test_run_ "$2"
+		if [ "$?" = 0 -a "$eval_ret" = 0 ]
+		then
+			test_ok_ "$1"
+		else
+			test_failure_ "$@"
+		fi
+	fi
+	echo >&3 ""
+}
+
+test_expect_code () {
+	test "$#" = 4 && { prereq=$1; shift; } || prereq=
+	test "$#" = 3 ||
+	error "bug in the test script: not 3 or 4 parameters to test-expect-code"
+	if ! test_skip "$@"
+	then
+		say >&3 "expecting exit code $1: $3"
+		test_run_ "$3"
+		if [ "$?" = 0 -a "$eval_ret" = "$1" ]
+		then
+			test_ok_ "$2"
+		else
+			test_failure_ "$@"
+		fi
+	fi
+	echo >&3 ""
+}
+
+# test_external runs external test scripts that provide continuous
+# test output about their progress, and succeeds/fails on
+# zero/non-zero exit code.  It outputs the test output on stdout even
+# in non-verbose mode, and announces the external script with "* run
+# <n>: ..." before running it.  When providing relative paths, keep in
+# mind that all scripts run in "trash directory".
+# Usage: test_external description command arguments...
+# Example: test_external 'Perl API' perl ../path/to/test.pl
+test_external () {
+	test "$#" = 4 && { prereq=$1; shift; } || prereq=
+	test "$#" = 3 ||
+	error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
+	descr="$1"
+	shift
+	if ! test_skip "$descr" "$@"
+	then
+		# Announce the script to reduce confusion about the
+		# test output that follows.
+		say_color "" " run $test_count: $descr ($*)"
+		# Run command; redirect its stderr to &4 as in
+		# test_run_, but keep its stdout on our stdout even in
+		# non-verbose mode.
+		"$@" 2>&4
+		if [ "$?" = 0 ]
+		then
+			test_ok_ "$descr"
+		else
+			test_failure_ "$descr" "$@"
+		fi
+	fi
+}
+
+# Like test_external, but in addition tests that the command generated
+# no output on stderr.
+test_external_without_stderr () {
+	# The temporary file has no (and must have no) security
+	# implications.
+	tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
+	stderr="$tmp/git-external-stderr.$$.tmp"
+	test_external "$@" 4> "$stderr"
+	[ -f "$stderr" ] || error "Internal error: $stderr disappeared."
+	descr="no stderr: $1"
+	shift
+	say >&3 "expecting no stderr from previous command"
+	if [ ! -s "$stderr" ]; then
+		rm "$stderr"
+		test_ok_ "$descr"
+	else
+		if [ "$verbose" = t ]; then
+			output=`echo; echo Stderr is:; cat "$stderr"`
+		else
+			output=
+		fi
+		# rm first in case test_failure exits.
+		rm "$stderr"
+		test_failure_ "$descr" "$@" "$output"
+	fi
+}
+
+# This is not among top-level (test_expect_success | test_expect_failure)
+# but is a prefix that can be used in the test script, like:
+#
+#	test_expect_success 'complain and die' '
+#           do something &&
+#           do something else &&
+#	    test_must_fail git checkout ../outerspace
+#	'
+#
+# Writing this as "! git checkout ../outerspace" is wrong, because
+# the failure could be due to a segv.  We want a controlled failure.
+
+test_must_fail () {
+	"$@"
+	test $? -gt 0 -a $? -le 129 -o $? -gt 192
+}
+
+# test_cmp is a helper function to compare actual and expected output.
+# You can use it like:
+#
+#	test_expect_success 'foo works' '
+#		echo expected >expected &&
+#		foo >actual &&
+#		test_cmp expected actual
+#	'
+#
+# This could be written as either "cmp" or "diff -u", but:
+# - cmp's output is not nearly as easy to read as diff -u
+# - not all diff versions understand "-u"
+
+test_cmp() {
+	$GIT_TEST_CMP "$@"
+}
+
+# This function can be used to schedule some commands to be run
+# unconditionally at the end of the test to restore sanity:
+#
+#	test_expect_success 'test core.capslock' '
+#		git config core.capslock true &&
+#		test_when_finished "git config --unset core.capslock" &&
+#		hello world
+#	'
+#
+# That would be roughly equivalent to
+#
+#	test_expect_success 'test core.capslock' '
+#		git config core.capslock true &&
+#		hello world
+#		git config --unset core.capslock
+#	'
+#
+# except that the greeting and config --unset must both succeed for
+# the test to pass.
+
+test_when_finished () {
+	test_cleanup="{ $*
+		} && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
+}
+
+# Most tests can use the created repository, but some may need to create more.
+# Usage: test_create_repo <directory>
+test_create_repo () {
+	test "$#" = 1 ||
+	error "bug in the test script: not 1 parameter to test-create-repo"
+	owd=`pwd`
+	repo="$1"
+	mkdir -p "$repo"
+	cd "$repo" || error "Cannot setup test environment"
+	"$GIT_EXEC_PATH/git-init" "--template=$TEST_DIRECTORY/../templates/blt/" >&3 2>&4 ||
+	error "cannot run git init -- have you built things yet?"
+	mv .git/hooks .git/hooks-disabled
+	cd "$owd"
+}
+
+test_done () {
+	GIT_EXIT_OK=t
+	test_results_dir="$TEST_DIRECTORY/test-results"
+	mkdir -p "$test_results_dir"
+	test_results_path="$test_results_dir/${0%.sh}-$$"
+
+	echo "total $test_count" >> $test_results_path
+	echo "success $test_success" >> $test_results_path
+	echo "fixed $test_fixed" >> $test_results_path
+	echo "broken $test_broken" >> $test_results_path
+	echo "failed $test_failure" >> $test_results_path
+	echo "" >> $test_results_path
+
+	if test "$test_fixed" != 0
+	then
+		say_color pass "fixed $test_fixed known breakage(s)"
+	fi
+	if test "$test_broken" != 0
+	then
+		say_color error "still have $test_broken known breakage(s)"
+		msg="remaining $(($test_count-$test_broken)) test(s)"
+	else
+		msg="$test_count test(s)"
+	fi
+	case "$test_failure" in
+	0)
+		say_color pass "passed all $msg"
+
+		test -d "$remove_trash" &&
+		cd "$(dirname "$remove_trash")" &&
+		rm -rf "$(basename "$remove_trash")"
+
+		exit 0 ;;
+
+	*)
+		say_color error "failed $test_failure among $msg"
+		exit 1 ;;
+
+	esac
+}
+
+# Test the binaries we have just built.  The tests are kept in
+# t/ subdirectory and are run in 'trash directory' subdirectory.
+TEST_DIRECTORY=$(pwd)
+if test -n "$valgrind"
+then
+	make_symlink () {
+		test -h "$2" &&
+		test "$1" = "$(readlink "$2")" || {
+			# be super paranoid
+			if mkdir "$2".lock
+			then
+				rm -f "$2" &&
+				ln -s "$1" "$2" &&
+				rm -r "$2".lock
+			else
+				while test -d "$2".lock
+				do
+					say "Waiting for lock on $2."
+					sleep 1
+				done
+			fi
+		}
+	}
+
+	make_valgrind_symlink () {
+		# handle only executables
+		test -x "$1" || return
+
+		base=$(basename "$1")
+		symlink_target=$TEST_DIRECTORY/../$base
+		# do not override scripts
+		if test -x "$symlink_target" &&
+		    test ! -d "$symlink_target" &&
+		    test "#!" != "$(head -c 2 < "$symlink_target")"
+		then
+			symlink_target=../valgrind.sh
+		fi
+		case "$base" in
+		*.sh|*.perl)
+			symlink_target=../unprocessed-script
+		esac
+		# create the link, or replace it if it is out of date
+		make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
+	}
+
+	# override all git executables in TEST_DIRECTORY/..
+	GIT_VALGRIND=$TEST_DIRECTORY/valgrind
+	mkdir -p "$GIT_VALGRIND"/bin
+	for file in $TEST_DIRECTORY/../git* $TEST_DIRECTORY/../test-*
+	do
+		make_valgrind_symlink $file
+	done
+	OLDIFS=$IFS
+	IFS=:
+	for path in $PATH
+	do
+		ls "$path"/git-* 2> /dev/null |
+		while read file
+		do
+			make_valgrind_symlink "$file"
+		done
+	done
+	IFS=$OLDIFS
+	PATH=$GIT_VALGRIND/bin:$PATH
+	GIT_EXEC_PATH=$GIT_VALGRIND/bin
+	export GIT_VALGRIND
+elif test -n "$GIT_TEST_INSTALLED" ; then
+	GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
+	error "Cannot run git from $GIT_TEST_INSTALLED."
+	PATH=$GIT_TEST_INSTALLED:$TEST_DIRECTORY/..:$PATH
+	GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
+else # normal case, use ../bin-wrappers only unless $with_dashes:
+	git_bin_dir="$TEST_DIRECTORY/../bin-wrappers"
+	if ! test -x "$git_bin_dir/git" ; then
+		if test -z "$with_dashes" ; then
+			say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
+		fi
+		with_dashes=t
+	fi
+	PATH="$git_bin_dir:$PATH"
+	GIT_EXEC_PATH=$TEST_DIRECTORY/..
+	if test -n "$with_dashes" ; then
+		PATH="$TEST_DIRECTORY/..:$PATH"
+	fi
+fi
+GIT_TEMPLATE_DIR=$(pwd)/../templates/blt
+unset GIT_CONFIG
+GIT_CONFIG_NOSYSTEM=1
+GIT_CONFIG_NOGLOBAL=1
+export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_CONFIG_NOGLOBAL
+
+. ../GIT-BUILD-OPTIONS
+
+GITPERLLIB=$(pwd)/../perl/blib/lib:$(pwd)/../perl/blib/arch/auto/Git
+export GITPERLLIB
+test -d ../templates/blt || {
+	error "You haven't built things yet, have you?"
+}
+
+if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
+then
+	GITPYTHONLIB="$(pwd)/../git_remote_helpers/build/lib"
+	export GITPYTHONLIB
+	test -d ../git_remote_helpers/build || {
+		error "You haven't built git_remote_helpers yet, have you?"
+	}
+fi
+
+if ! test -x ../test-chmtime; then
+	echo >&2 'You need to build test-chmtime:'
+	echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
+	exit 1
+fi
+
+# Test repository
+test="trash directory.$(basename "$0" .sh)"
+test -n "$root" && test="$root/$test"
+case "$test" in
+/*) TRASH_DIRECTORY="$test" ;;
+ *) TRASH_DIRECTORY="$TEST_DIRECTORY/$test" ;;
+esac
+test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
+rm -fr "$test" || {
+	GIT_EXIT_OK=t
+	echo >&5 "FATAL: Cannot prepare test area"
+	exit 1
+}
+
+test_create_repo "$test"
+# Use -P to resolve symlinks in our working directory so that the cwd
+# in subprocesses like git equals our $PWD (for pathname comparisons).
+cd -P "$test" || exit 1
+
+this_test=${0##*/}
+this_test=${this_test%%-*}
+for skp in $GIT_SKIP_TESTS
+do
+	to_skip=
+	for skp in $GIT_SKIP_TESTS
+	do
+		case "$this_test" in
+		$skp)
+			to_skip=t
+		esac
+	done
+	case "$to_skip" in
+	t)
+		say_color skip >&3 "skipping test $this_test altogether"
+		say_color skip "skip all tests in $this_test"
+		test_done
+	esac
+done
+
+# Provide an implementation of the 'yes' utility
+yes () {
+	if test $# = 0
+	then
+		y=y
+	else
+		y="$*"
+	fi
+
+	while echo "$y"
+	do
+		:
+	done
+}
+
+# Fix some commands on Windows
+case $(uname -s) in
+*MINGW*)
+	# Windows has its own (incompatible) sort and find
+	sort () {
+		/usr/bin/sort "$@"
+	}
+	find () {
+		/usr/bin/find "$@"
+	}
+	sum () {
+		md5sum "$@"
+	}
+	# git sees Windows-style pwd
+	pwd () {
+		builtin pwd -W
+	}
+	# no POSIX permissions
+	# backslashes in pathspec are converted to '/'
+	# exec does not inherit the PID
+	;;
+*)
+	test_set_prereq POSIXPERM
+	test_set_prereq BSLASHPSPEC
+	test_set_prereq EXECKEEPSPID
+	;;
+esac
+
+test -z "$NO_PERL" && test_set_prereq PERL
+test -z "$NO_PYTHON" && test_set_prereq PYTHON
+
+# test whether the filesystem supports symbolic links
+ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
+rm -f y