git-interface: Add test suite and basic tests

Add basic tests for the Git interface. The test suite is based on
sharness.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

1 files changed, 851 insertions, 0 deletions

diff --git a/git-interface/test/sharness.sh b/git-interface/test/sharness.sh
new file mode 100644
index 00000000..1d57ce9a
--- /dev/null
+++ b/git-interface/test/sharness.sh
@@ -0,0 +1,851 @@
+#!/bin/sh
+#
+# Copyright (c) 2011-2012 Mathias Lafeldt
+# Copyright (c) 2005-2012 Git project
+# Copyright (c) 2005-2012 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/ .
+
+# Public: Current version of Sharness.
+SHARNESS_VERSION="1.0.0"
+export SHARNESS_VERSION
+
+# Public: The file extension for tests.  By default, it is set to "t".
+: ${SHARNESS_TEST_EXTENSION:=t}
+export SHARNESS_TEST_EXTENSION
+
+#  Reset TERM to original terminal if found, otherwise save orignal TERM
+[ "x" = "x$SHARNESS_ORIG_TERM" ] &&
+		SHARNESS_ORIG_TERM="$TERM" ||
+		TERM="$SHARNESS_ORIG_TERM"
+# Public: The unsanitized TERM under which sharness is originally run
+export SHARNESS_ORIG_TERM
+
+# Export SHELL_PATH
+: ${SHELL_PATH:=$SHELL}
+export SHELL_PATH
+
+# For repeatability, reset the environment to a known state.
+# TERM is sanitized below, after saving color control sequences.
+LANG=C
+LC_ALL=C
+PAGER=cat
+TZ=UTC
+EDITOR=:
+export LANG LC_ALL PAGER TZ EDITOR
+unset VISUAL CDPATH GREP_OPTIONS
+
+# Line feed
+LF='
+'
+
+[ "x$TERM" != "xdumb" ] && (
+		[ -t 1 ] &&
+		tput bold >/dev/null 2>&1 &&
+		tput setaf 1 >/dev/null 2>&1 &&
+		tput sgr0 >/dev/null 2>&1
+	) &&
+	color=t
+
+while test "$#" -ne 0; do
+	case "$1" in
+	-d|--d|--de|--deb|--debu|--debug)
+		debug=t; shift ;;
+	-i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
+		immediate=t; shift ;;
+	-l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
+		TEST_LONG=t; export TEST_LONG; shift ;;
+	--in|--int|--inte|--inter|--intera|--interac|--interact|--interacti|--interactiv|--interactive|--interactive-|--interactive-t|--interactive-te|--interactive-tes|--interactive-test|--interactive-tests):
+		TEST_INTERACTIVE=t; export TEST_INTERACTIVE; verbose=t; shift ;;
+	-h|--h|--he|--hel|--help)
+		help=t; shift ;;
+	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
+		verbose=t; shift ;;
+	-q|--q|--qu|--qui|--quie|--quiet)
+		# Ignore --quiet under a TAP::Harness. Saying how many tests
+		# passed without the ok/not ok details is always an error.
+		test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
+	--chain-lint)
+		chain_lint=t; shift ;;
+	--no-chain-lint)
+		chain_lint=; shift ;;
+	--no-color)
+		color=; shift ;;
+	--root=*)
+		root=$(expr "z$1" : 'z[^=]*=\(.*\)')
+		shift ;;
+	*)
+		echo "error: unknown test option '$1'" >&2; exit 1 ;;
+	esac
+done
+
+if test -n "$color"; then
+	# Save the color control sequences now rather than run tput
+	# each time say_color() is called.  This is done for two
+	# reasons:
+	#   * TERM will be changed to dumb
+	#   * HOME will be changed to a temporary directory and tput
+	#     might need to read ~/.terminfo from the original HOME
+	#     directory to get the control sequences
+	# Note:  This approach assumes the control sequences don't end
+	# in a newline for any terminal of interest (command
+	# substitutions strip trailing newlines).  Given that most
+	# (all?) terminals in common use are related to ECMA-48, this
+	# shouldn't be a problem.
+	say_color_error=$(tput bold; tput setaf 1) # bold red
+	say_color_skip=$(tput setaf 4) # blue
+	say_color_warn=$(tput setaf 3) # brown/yellow
+	say_color_pass=$(tput setaf 2) # green
+	say_color_info=$(tput setaf 6) # cyan
+	say_color_reset=$(tput sgr0)
+	say_color_="" # no formatting for normal text
+	say_color() {
+		test -z "$1" && test -n "$quiet" && return
+		eval "say_color_color=\$say_color_$1"
+		shift
+		printf "%s\\n" "$say_color_color$*$say_color_reset"
+	}
+else
+	say_color() {
+		test -z "$1" && test -n "$quiet" && return
+		shift
+		printf "%s\n" "$*"
+	}
+fi
+
+TERM=dumb
+export TERM
+
+error() {
+	say_color error "error: $*"
+	EXIT_OK=t
+	exit 1
+}
+
+say() {
+	say_color info "$*"
+}
+
+test -n "$test_description" || error "Test script did not set test_description."
+
+if test "$help" = "t"; then
+	echo "$test_description"
+	exit 0
+fi
+
+exec 5>&1
+exec 6<&0
+if test "$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=$?
+	if test -n "$EXIT_OK"; then
+		exit $code
+	else
+		echo >&5 "FATAL: Unexpected exit with code $code"
+		exit 1
+	fi
+}
+
+EXIT_OK=
+trap 'die' EXIT
+
+# Public: Define that a test prerequisite is available.
+#
+# The prerequisite can later be checked explicitly using test_have_prereq or
+# implicitly by specifying the prerequisite name in calls to test_expect_success
+# or test_expect_failure.
+#
+# $1 - Name of prerequiste (a simple word, in all capital letters by convention)
+#
+# Examples
+#
+#   # Set PYTHON prerequisite if interpreter is available.
+#   command -v python >/dev/null && test_set_prereq PYTHON
+#
+#   # Set prerequisite depending on some variable.
+#   test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
+#
+# Returns nothing.
+test_set_prereq() {
+	satisfied_prereq="$satisfied_prereq$1 "
+}
+satisfied_prereq=" "
+
+# Public: Check if one or more test prerequisites are defined.
+#
+# The prerequisites must have previously been set with test_set_prereq.
+# The most common use of this is to skip all the tests if some essential
+# prerequisite is missing.
+#
+# $1 - Comma-separated list of test prerequisites.
+#
+# Examples
+#
+#   # Skip all remaining tests if prerequisite is not set.
+#   if ! test_have_prereq PERL; then
+#       skip_all='skipping perl interface tests, perl not available'
+#       test_done
+#   fi
+#
+# Returns 0 if all prerequisites are defined or 1 otherwise.
+test_have_prereq() {
+	# prerequisites can be concatenated with ','
+	save_IFS=$IFS
+	IFS=,
+	set -- $*
+	IFS=$save_IFS
+
+	total_prereq=0
+	ok_prereq=0
+	missing_prereq=
+
+	for prerequisite; do
+		case "$prerequisite" in
+		!*)
+			negative_prereq=t
+			prerequisite=${prerequisite#!}
+			;;
+		*)
+			negative_prereq=
+		esac
+
+		total_prereq=$(($total_prereq + 1))
+		case "$satisfied_prereq" in
+		*" $prerequisite "*)
+			satisfied_this_prereq=t
+			;;
+		*)
+			satisfied_this_prereq=
+		esac
+
+		case "$satisfied_this_prereq,$negative_prereq" in
+		t,|,t)
+			ok_prereq=$(($ok_prereq + 1))
+			;;
+		*)
+			# Keep a list of missing prerequisites; restore
+			# the negative marker if necessary.
+			prerequisite=${negative_prereq:+!}$prerequisite
+			if test -z "$missing_prereq"; then
+				missing_prereq=$prerequisite
+			else
+				missing_prereq="$prerequisite,$missing_prereq"
+			fi
+		esac
+	done
+
+	test $total_prereq = $ok_prereq
+}
+
+# You are not expected to call test_ok_ and test_failure_ directly, use
+# the text_expect_* functions instead.
+
+test_ok_() {
+	test_success=$(($test_success + 1))
+	say_color "" "ok $test_count - $@"
+}
+
+test_failure_() {
+	test_failure=$(($test_failure + 1))
+	say_color error "not ok $test_count - $1"
+	shift
+	echo "$@" | sed -e 's/^/#	/'
+	test "$immediate" = "" || { EXIT_OK=t; exit 1; }
+}
+
+test_known_broken_ok_() {
+	test_fixed=$(($test_fixed + 1))
+	say_color error "ok $test_count - $@ # TODO known breakage vanished"
+}
+
+test_known_broken_failure_() {
+	test_broken=$(($test_broken + 1))
+	say_color warn "not ok $test_count - $@ # TODO known breakage"
+}
+
+# Public: Execute commands in debug mode.
+#
+# Takes a single argument and evaluates it only when the test script is started
+# with --debug. This is primarily meant for use during the development of test
+# scripts.
+#
+# $1 - Commands to be executed.
+#
+# Examples
+#
+#   test_debug "cat some_log_file"
+#
+# Returns the exit code of the last command executed in debug mode or 0
+#   otherwise.
+test_debug() {
+	test "$debug" = "" || eval "$1"
+}
+
+# Public: Stop execution and start a shell.
+#
+# This is useful for debugging tests and only makes sense together with "-v".
+# Be sure to remove all invocations of this command before submitting.
+test_pause() {
+	if test "$verbose" = t; then
+		"$SHELL_PATH" <&6 >&3 2>&4
+	else
+		error >&5 "test_pause requires --verbose"
+	fi
+}
+
+test_eval_() {
+	# This is a separate function because some tests use
+	# "return" to end a test_expect_success block early.
+	case ",$test_prereq," in
+	*,INTERACTIVE,*)
+		eval "$*"
+		;;
+	*)
+		eval </dev/null >&3 2>&4 "$*"
+		;;
+	esac
+}
+
+test_run_() {
+	test_cleanup=:
+	expecting_failure=$2
+	test_eval_ "$1"
+	eval_ret=$?
+
+	if test "$chain_lint" = "t"; then
+		test_eval_ "(exit 117) && $1"
+		if test "$?" != 117; then
+			error "bug in the test script: broken &&-chain: $1"
+		fi
+	fi
+
+	if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"; then
+		test_eval_ "$test_cleanup"
+	fi
+	if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"; then
+		echo ""
+	fi
+	return "$eval_ret"
+}
+
+test_skip_() {
+	test_count=$(($test_count + 1))
+	to_skip=
+	for skp in $SKIP_TESTS; do
+		case $this_test.$test_count in
+		$skp)
+			to_skip=t
+			break
+		esac
+	done
+	if test -z "$to_skip" && test -n "$test_prereq" && ! test_have_prereq "$test_prereq"; then
+		to_skip=t
+	fi
+	case "$to_skip" in
+	t)
+		of_prereq=
+		if test "$missing_prereq" != "$test_prereq"; then
+			of_prereq=" of $test_prereq"
+		fi
+
+		say_color skip >&3 "skipping test: $@"
+		say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
+		: true
+		;;
+	*)
+		false
+		;;
+	esac
+}
+
+# Public: Run test commands and expect them to succeed.
+#
+# When the test passed, an "ok" message is printed and the number of successful
+# tests is incremented. When it failed, a "not ok" message is printed and the
+# number of failed tests is incremented.
+#
+# With --immediate, exit test immediately upon the first failed test.
+#
+# Usually takes two arguments:
+# $1 - Test description
+# $2 - Commands to be executed.
+#
+# With three arguments, the first will be taken to be a prerequisite:
+# $1 - Comma-separated list of test prerequisites. The test will be skipped if
+#      not all of the given prerequisites are set. To negate a prerequisite,
+#      put a "!" in front of it.
+# $2 - Test description
+# $3 - Commands to be executed.
+#
+# Examples
+#
+#   test_expect_success \
+#       'git-write-tree should be able to write an empty tree.' \
+#       'tree=$(git-write-tree)'
+#
+#   # Test depending on one prerequisite.
+#   test_expect_success TTY 'git --paginate rev-list uses a pager' \
+#       ' ... '
+#
+#   # Multiple prerequisites are separated by a comma.
+#   test_expect_success PERL,PYTHON 'yo dawg' \
+#       ' test $(perl -E 'print eval "1 +" . qx[python -c "print 2"]') == "4" '
+#
+# Returns nothing.
+test_expect_success() {
+	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
+	test "$#" = 2 || error "bug in the test script: not 2 or 3 parameters to test_expect_success"
+	export test_prereq
+	if ! test_skip_ "$@"; then
+		say >&3 "expecting success: $2"
+		if test_run_ "$2"; then
+			test_ok_ "$1"
+		else
+			test_failure_ "$@"
+		fi
+	fi
+	echo >&3 ""
+}
+
+# Public: Run test commands and expect them to fail. Used to demonstrate a known
+# breakage.
+#
+# This is NOT the opposite of test_expect_success, but rather used to mark a
+# test that demonstrates a known breakage.
+#
+# When the test passed, an "ok" message is printed and the number of fixed tests
+# is incremented. When it failed, a "not ok" message is printed and the number
+# of tests still broken is incremented.
+#
+# Failures from these tests won't cause --immediate to stop.
+#
+# Usually takes two arguments:
+# $1 - Test description
+# $2 - Commands to be executed.
+#
+# With three arguments, the first will be taken to be a prerequisite:
+# $1 - Comma-separated list of test prerequisites. The test will be skipped if
+#      not all of the given prerequisites are set. To negate a prerequisite,
+#      put a "!" in front of it.
+# $2 - Test description
+# $3 - Commands to be executed.
+#
+# Returns nothing.
+test_expect_failure() {
+	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
+	test "$#" = 2 || error "bug in the test script: not 2 or 3 parameters to test_expect_failure"
+	export test_prereq
+	if ! test_skip_ "$@"; then
+		say >&3 "checking known breakage: $2"
+		if test_run_ "$2" expecting_failure; then
+			test_known_broken_ok_ "$1"
+		else
+			test_known_broken_failure_ "$1"
+		fi
+	fi
+	echo >&3 ""
+}
+
+# Public: Run command and ensure that it fails in a controlled way.
+#
+# Use it instead of "! <command>". For example, when <command> dies due to a
+# segfault, test_must_fail diagnoses it as an error, while "! <command>" would
+# mistakenly be treated as just another expected failure.
+#
+# This is one of the prefix functions to be used inside test_expect_success or
+# test_expect_failure.
+#
+# $1.. - Command to be executed.
+#
+# Examples
+#
+#   test_expect_success 'complain and die' '
+#       do something &&
+#       do something else &&
+#       test_must_fail git checkout ../outerspace
+#   '
+#
+# Returns 1 if the command succeeded (exit code 0).
+# Returns 1 if the command died by signal (exit codes 130-192)
+# Returns 1 if the command could not be found (exit code 127).
+# Returns 0 otherwise.
+test_must_fail() {
+	"$@"
+	exit_code=$?
+	if test $exit_code = 0; then
+		echo >&2 "test_must_fail: command succeeded: $*"
+		return 1
+	elif test $exit_code -gt 129 -a $exit_code -le 192; then
+		echo >&2 "test_must_fail: died by signal: $*"
+		return 1
+	elif test $exit_code = 127; then
+		echo >&2 "test_must_fail: command not found: $*"
+		return 1
+	fi
+	return 0
+}
+
+# Public: Run command and ensure that it succeeds or fails in a controlled way.
+#
+# Similar to test_must_fail, but tolerates success too. Use it instead of
+# "<command> || :" to catch failures caused by a segfault, for instance.
+#
+# This is one of the prefix functions to be used inside test_expect_success or
+# test_expect_failure.
+#
+# $1.. - Command to be executed.
+#
+# Examples
+#
+#   test_expect_success 'some command works without configuration' '
+#       test_might_fail git config --unset all.configuration &&
+#       do something
+#   '
+#
+# Returns 1 if the command died by signal (exit codes 130-192)
+# Returns 1 if the command could not be found (exit code 127).
+# Returns 0 otherwise.
+test_might_fail() {
+	"$@"
+	exit_code=$?
+	if test $exit_code -gt 129 -a $exit_code -le 192; then
+		echo >&2 "test_might_fail: died by signal: $*"
+		return 1
+	elif test $exit_code = 127; then
+		echo >&2 "test_might_fail: command not found: $*"
+		return 1
+	fi
+	return 0
+}
+
+# Public: Run command and ensure it exits with a given exit code.
+#
+# This is one of the prefix functions to be used inside test_expect_success or
+# test_expect_failure.
+#
+# $1   - Expected exit code.
+# $2.. - Command to be executed.
+#
+# Examples
+#
+#   test_expect_success 'Merge with d/f conflicts' '
+#       test_expect_code 1 git merge "merge msg" B master
+#   '
+#
+# Returns 0 if the expected exit code is returned or 1 otherwise.
+test_expect_code() {
+	want_code=$1
+	shift
+	"$@"
+	exit_code=$?
+	if test $exit_code = $want_code; then
+		return 0
+	fi
+
+	echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
+	return 1
+}
+
+# Public: Compare two files to see if expected output matches actual output.
+#
+# The TEST_CMP variable defines the command used for the comparision; it
+# defaults to "diff -u". Only when the test script was started with --verbose,
+# will the command's output, the diff, be printed to the standard output.
+#
+# This is one of the prefix functions to be used inside test_expect_success or
+# test_expect_failure.
+#
+# $1 - Path to file with expected output.
+# $2 - Path to file with actual output.
+#
+# Examples
+#
+#   test_expect_success 'foo works' '
+#       echo expected >expected &&
+#       foo >actual &&
+#       test_cmp expected actual
+#   '
+#
+# Returns the exit code of the command set by TEST_CMP.
+test_cmp() {
+	${TEST_CMP:-diff -u} "$@"
+}
+
+# Public: portably print a sequence of numbers.
+#
+# seq is not in POSIX and GNU seq might not be available everywhere,
+# so it is nice to have a seq implementation, even a very simple one.
+#
+# $1 - Starting number.
+# $2 - Ending number.
+#
+# Examples
+#
+#   test_expect_success 'foo works 10 times' '
+#       for i in $(test_seq 1 10)
+#       do
+#           foo || return
+#       done
+#   '
+#
+# Returns 0 if all the specified numbers can be displayed.
+test_seq() {
+	i="$1"
+	j="$2"
+	while test "$i" -le "$j"
+	do
+		echo "$i" || return
+		i=$(expr "$i" + 1)
+	done
+}
+
+# Public: Check if the file expected to be empty is indeed empty, and barfs
+# otherwise.
+#
+# $1 - File to check for emptyness.
+#
+# Returns 0 if file is empty, 1 otherwise.
+test_must_be_empty() {
+	if test -s "$1"
+	then
+		echo "'$1' is not empty, it contains:"
+		cat "$1"
+		return 1
+	fi
+}
+
+# Public: Schedule cleanup commands to be run unconditionally at the end of a
+# test.
+#
+# If some cleanup command fails, the test will not pass. With --immediate, no
+# cleanup is done to help diagnose what went wrong.
+#
+# This is one of the prefix functions to be used inside test_expect_success or
+# test_expect_failure.
+#
+# $1.. - Commands to prepend to the list of cleanup commands.
+#
+# Examples
+#
+#   test_expect_success 'test core.capslock' '
+#       git config core.capslock true &&
+#       test_when_finished "git config --unset core.capslock" &&
+#       do_something
+#   '
+#
+# Returns the exit code of the last cleanup command executed.
+test_when_finished() {
+	test_cleanup="{ $*
+		} && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
+}
+
+# Public: Schedule cleanup commands to be run unconditionally when all tests
+# have run.
+#
+# This can be used to clean up things like test databases. It is not needed to
+# clean up temporary files, as test_done already does that.
+#
+# Examples:
+#
+#   cleanup mysql -e "DROP DATABASE mytest"
+#
+# Returns the exit code of the last cleanup command executed.
+final_cleanup=
+cleanup() {
+	final_cleanup="{ $*
+		} && (exit \"\$eval_ret\"); eval_ret=\$?; $final_cleanup"
+}
+
+# Public: Summarize test results and exit with an appropriate error code.
+#
+# Must be called at the end of each test script.
+#
+# Can also be used to stop tests early and skip all remaining tests. For this,
+# set skip_all to a string explaining why the tests were skipped before calling
+# test_done.
+#
+# Examples
+#
+#   # Each test script must call test_done at the end.
+#   test_done
+#
+#   # Skip all remaining tests if prerequisite is not set.
+#   if ! test_have_prereq PERL; then
+#       skip_all='skipping perl interface tests, perl not available'
+#       test_done
+#   fi
+#
+# Returns 0 if all tests passed or 1 if there was a failure.
+test_done() {
+	EXIT_OK=t
+
+	if test -z "$HARNESS_ACTIVE"; then
+		test_results_dir="$SHARNESS_TEST_DIRECTORY/test-results"
+		mkdir -p "$test_results_dir"
+		test_results_path="$test_results_dir/$this_test.$$.counts"
+
+		cat >>"$test_results_path" <<-EOF
+		total $test_count
+		success $test_success
+		fixed $test_fixed
+		broken $test_broken
+		failed $test_failure
+
+		EOF
+	fi
+
+	if test "$test_fixed" != 0; then
+		say_color error "# $test_fixed known breakage(s) vanished; please update test(s)"
+	fi
+	if test "$test_broken" != 0; then
+		say_color warn "# still have $test_broken known breakage(s)"
+	fi
+	if test "$test_broken" != 0 || test "$test_fixed" != 0; then
+		test_remaining=$(( $test_count - $test_broken - $test_fixed ))
+		msg="remaining $test_remaining test(s)"
+	else
+		test_remaining=$test_count
+		msg="$test_count test(s)"
+	fi
+
+	case "$test_failure" in
+	0)
+		# Maybe print SKIP message
+		if test -n "$skip_all" && test $test_count -gt 0; then
+			error "Can't use skip_all after running some tests"
+		fi
+		[ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
+
+		if test $test_remaining -gt 0; then
+			say_color pass "# passed all $msg"
+		fi
+		say "1..$test_count$skip_all"
+
+		test_eval_ "$final_cleanup"
+
+		test -d "$remove_trash" &&
+		cd "$(dirname "$remove_trash")" &&
+		rm -rf "$(basename "$remove_trash")"
+
+		exit 0 ;;
+
+	*)
+		say_color error "# failed $test_failure among $msg"
+		say "1..$test_count"
+
+		exit 1 ;;
+
+	esac
+}
+
+# Public: Root directory containing tests. Tests can override this variable,
+# e.g. for testing Sharness itself.
+: ${SHARNESS_TEST_DIRECTORY:=$(pwd)}
+export SHARNESS_TEST_DIRECTORY
+
+# Public: Source directory of test code and sharness library.
+# This directory may be different from the directory in which tests are
+# being run.
+: ${SHARNESS_TEST_SRCDIR:=$(cd $(dirname $0) && pwd)}
+export SHARNESS_TEST_SRCDIR
+
+# Public: Build directory that will be added to PATH. By default, it is set to
+# the parent directory of SHARNESS_TEST_DIRECTORY.
+: ${SHARNESS_BUILD_DIRECTORY:="$SHARNESS_TEST_DIRECTORY/.."}
+PATH="$SHARNESS_BUILD_DIRECTORY:$PATH"
+export PATH SHARNESS_BUILD_DIRECTORY
+
+# Public: Path to test script currently executed.
+SHARNESS_TEST_FILE="$0"
+export SHARNESS_TEST_FILE
+
+# Prepare test area.
+SHARNESS_TRASH_DIRECTORY="trash directory.$(basename "$SHARNESS_TEST_FILE" ".$SHARNESS_TEST_EXTENSION")"
+test -n "$root" && SHARNESS_TRASH_DIRECTORY="$root/$SHARNESS_TRASH_DIRECTORY"
+case "$SHARNESS_TRASH_DIRECTORY" in
+/*) ;; # absolute path is good
+ *) SHARNESS_TRASH_DIRECTORY="$SHARNESS_TEST_DIRECTORY/$SHARNESS_TRASH_DIRECTORY" ;;
+esac
+test "$debug" = "t" || remove_trash="$SHARNESS_TRASH_DIRECTORY"
+rm -rf "$SHARNESS_TRASH_DIRECTORY" || {
+	EXIT_OK=t
+	echo >&5 "FATAL: Cannot prepare test area"
+	exit 1
+}
+
+
+#
+#  Load any extensions in $srcdir/sharness.d/*.sh
+#
+if test -d "${SHARNESS_TEST_SRCDIR}/sharness.d"
+then
+	for file in "${SHARNESS_TEST_SRCDIR}"/sharness.d/*.sh
+	do
+		# Ensure glob was not an empty match:
+		test -e "${file}" || break
+
+		if test -n "$debug"
+		then
+			echo >&5 "sharness: loading extensions from ${file}"
+		fi
+		. "${file}"
+		if test $? != 0
+		then
+			echo >&5 "sharness: Error loading ${file}. Aborting."
+			exit 1
+		fi
+	done
+fi
+
+# Public: Empty trash directory, the test area, provided for each test. The HOME
+# variable is set to that directory too.
+export SHARNESS_TRASH_DIRECTORY
+
+HOME="$SHARNESS_TRASH_DIRECTORY"
+export HOME
+
+mkdir -p "$SHARNESS_TRASH_DIRECTORY" || exit 1
+# Use -P to resolve symlinks in our working directory so that the cwd
+# in subprocesses like git equals our $PWD (for pathname comparisons).
+cd -P "$SHARNESS_TRASH_DIRECTORY" || exit 1
+
+this_test=${SHARNESS_TEST_FILE##*/}
+this_test=${this_test%.$SHARNESS_TEST_EXTENSION}
+for skp in $SKIP_TESTS; do
+	case "$this_test" in
+	$skp)
+		say_color info >&3 "skipping test $this_test altogether"
+		skip_all="skip all tests in $this_test"
+		test_done
+	esac
+done
+
+test -n "$TEST_LONG" && test_set_prereq EXPENSIVE
+test -n "$TEST_INTERACTIVE" && test_set_prereq INTERACTIVE
+
+# Make sure this script ends with code 0
+:
+
+# vi: set ts=4 sw=4 noet :