t/test-lib.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see http://www.gnu.org/licenses/ .
  17
  18 # if --tee was passed, write the output not only to the terminal, but
  19 # additionally to the file test-results/$BASENAME.out, too.
  20 case "$GIT_TEST_TEE_STARTED, $* " in
  21 done,*)
  22         # do not redirect again
  23         ;;
  24 *' --tee '*|*' --va'*)
  25         mkdir -p test-results
  26         BASE=test-results/$(basename "$0" .sh)
  27         (GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
  28          echo $? > $BASE.exit) | tee $BASE.out
  29         test "$(cat $BASE.exit)" = 0
  30         exit
  31         ;;
  32 esac
  33
  34 # Keep the original TERM for say_color
  35 ORIGINAL_TERM=$TERM
  36
  37 # For repeatability, reset the environment to known value.
  38 LANG=C
  39 LC_ALL=C
  40 PAGER=cat
  41 TZ=UTC
  42 TERM=dumb
  43 export LANG LC_ALL PAGER TERM TZ
  44 EDITOR=:
  45 unset VISUAL
  46 unset GIT_EDITOR
  47 unset AUTHOR_DATE
  48 unset AUTHOR_EMAIL
  49 unset AUTHOR_NAME
  50 unset COMMIT_AUTHOR_EMAIL
  51 unset COMMIT_AUTHOR_NAME
  52 unset EMAIL
  53 unset GIT_ALTERNATE_OBJECT_DIRECTORIES
  54 unset GIT_AUTHOR_DATE
  55 GIT_AUTHOR_EMAIL=author@example.com
  56 GIT_AUTHOR_NAME='A U Thor'
  57 unset GIT_COMMITTER_DATE
  58 GIT_COMMITTER_EMAIL=committer@example.com
  59 GIT_COMMITTER_NAME='C O Mitter'
  60 unset GIT_DIFF_OPTS
  61 unset GIT_DIR
  62 unset GIT_WORK_TREE
  63 unset GIT_EXTERNAL_DIFF
  64 unset GIT_INDEX_FILE
  65 unset GIT_OBJECT_DIRECTORY
  66 unset GIT_CEILING_DIRECTORIES
  67 unset SHA1_FILE_DIRECTORIES
  68 unset SHA1_FILE_DIRECTORY
  69 unset GIT_NOTES_REF
  70 unset GIT_NOTES_DISPLAY_REF
  71 unset GIT_NOTES_REWRITE_REF
  72 unset GIT_NOTES_REWRITE_MODE
  73 unset GIT_REFLOG_ACTION
  74 unset GIT_CHERRY_PICK_HELP
  75 unset GIT_QUIET
  76 GIT_MERGE_VERBOSITY=5
  77 export GIT_MERGE_VERBOSITY
  78 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
  79 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
  80 export EDITOR
  81
  82 # Protect ourselves from common misconfiguration to export
  83 # CDPATH into the environment
  84 unset CDPATH
  85
  86 unset GREP_OPTIONS
  87
  88 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
  89         1|2|true)
  90                 echo "* warning: Some tests will not work if GIT_TRACE" \
  91                         "is set as to trace on STDERR ! *"
  92                 echo "* warning: Please set GIT_TRACE to something" \
  93                         "other than 1, 2 or true ! *"
  94                 ;;
  95 esac
  96
  97 # Convenience
  98 #
  99 # A regexp to match 5 and 40 hexdigits
 100 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 101 _x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
 102
 103 # Each test should start with something like this, after copyright notices:
 104 #
 105 # test_description='Description of this test...
 106 # This test checks if command xyzzy does the right thing...
 107 # '
 108 # . ./test-lib.sh
 109 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
 110                 TERM=$ORIGINAL_TERM &&
 111                 export TERM &&
 112                 [ -t 1 ] &&
 113                 tput bold >/dev/null 2>&1 &&
 114                 tput setaf 1 >/dev/null 2>&1 &&
 115                 tput sgr0 >/dev/null 2>&1
 116         ) &&
 117         color=t
 118
 119 while test "$#" -ne 0
 120 do
 121         case "$1" in
 122         -d|--d|--de|--deb|--debu|--debug)
 123                 debug=t; shift ;;
 124         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
 125                 immediate=t; shift ;;
 126         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 127                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 128         -h|--h|--he|--hel|--help)
 129                 help=t; shift ;;
 130         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 131                 verbose=t; shift ;;
 132         -q|--q|--qu|--qui|--quie|--quiet)
 133                 # Ignore --quiet under a TAP::Harness. Saying how many tests
 134                 # passed without the ok/not ok details is always an error.
 135                 test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
 136         --with-dashes)
 137                 with_dashes=t; shift ;;
 138         --no-color)
 139                 color=; shift ;;
 140         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 141                 valgrind=t; verbose=t; shift ;;
 142         --tee)
 143                 shift ;; # was handled already
 144         --root=*)
 145                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 146                 shift ;;
 147         *)
 148                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
 149         esac
 150 done
 151
 152 if test -n "$color"; then
 153         say_color () {
 154                 (
 155                 TERM=$ORIGINAL_TERM
 156                 export TERM
 157                 case "$1" in
 158                         error) tput bold; tput setaf 1;; # bold red
 159                         skip)  tput bold; tput setaf 2;; # bold green
 160                         pass)  tput setaf 2;;            # green
 161                         info)  tput setaf 3;;            # brown
 162                         *) test -n "$quiet" && return;;
 163                 esac
 164                 shift
 165                 printf "%s" "$*"
 166                 tput sgr0
 167                 echo
 168                 )
 169         }
 170 else
 171         say_color() {
 172                 test -z "$1" && test -n "$quiet" && return
 173                 shift
 174                 echo "$*"
 175         }
 176 fi
 177
 178 error () {
 179         say_color error "error: $*"
 180         GIT_EXIT_OK=t
 181         exit 1
 182 }
 183
 184 say () {
 185         say_color info "$*"
 186 }
 187
 188 test "${test_description}" != "" ||
 189 error "Test script did not set test_description."
 190
 191 if test "$help" = "t"
 192 then
 193         echo "$test_description"
 194         exit 0
 195 fi
 196
 197 exec 5>&1
 198 if test "$verbose" = "t"
 199 then
 200         exec 4>&2 3>&1
 201 else
 202         exec 4>/dev/null 3>/dev/null
 203 fi
 204
 205 test_failure=0
 206 test_count=0
 207 test_fixed=0
 208 test_broken=0
 209 test_success=0
 210
 211 test_external_has_tap=0
 212
 213 die () {
 214         code=$?
 215         if test -n "$GIT_EXIT_OK"
 216         then
 217                 exit $code
 218         else
 219                 echo >&5 "FATAL: Unexpected exit with code $code"
 220                 exit 1
 221         fi
 222 }
 223
 224 GIT_EXIT_OK=
 225 trap 'die' EXIT
 226
 227 # The semantics of the editor variables are that of invoking
 228 # sh -c "$EDITOR \"$@\"" files ...
 229 #
 230 # If our trash directory contains shell metacharacters, they will be
 231 # interpreted if we just set $EDITOR directly, so do a little dance with
 232 # environment variables to work around this.
 233 #
 234 # In particular, quoting isn't enough, as the path may contain the same quote
 235 # that we're using.
 236 test_set_editor () {
 237         FAKE_EDITOR="$1"
 238         export FAKE_EDITOR
 239         EDITOR='"$FAKE_EDITOR"'
 240         export EDITOR
 241 }
 242
 243 test_decode_color () {
 244         awk '
 245                 function name(n) {
 246                         if (n == 0) return "RESET";
 247                         if (n == 1) return "BOLD";
 248                         if (n == 30) return "BLACK";
 249                         if (n == 31) return "RED";
 250                         if (n == 32) return "GREEN";
 251                         if (n == 33) return "YELLOW";
 252                         if (n == 34) return "BLUE";
 253                         if (n == 35) return "MAGENTA";
 254                         if (n == 36) return "CYAN";
 255                         if (n == 37) return "WHITE";
 256                         if (n == 40) return "BLACK";
 257                         if (n == 41) return "BRED";
 258                         if (n == 42) return "BGREEN";
 259                         if (n == 43) return "BYELLOW";
 260                         if (n == 44) return "BBLUE";
 261                         if (n == 45) return "BMAGENTA";
 262                         if (n == 46) return "BCYAN";
 263                         if (n == 47) return "BWHITE";
 264                 }
 265                 {
 266                         while (match($0, /\033\[[0-9;]*m/) != 0) {
 267                                 printf "%s<", substr($0, 1, RSTART-1);
 268                                 codes = substr($0, RSTART+2, RLENGTH-3);
 269                                 if (length(codes) == 0)
 270                                         printf "%s", name(0)
 271                                 else {
 272                                         n = split(codes, ary, ";");
 273                                         sep = "";
 274                                         for (i = 1; i <= n; i++) {
 275                                                 printf "%s%s", sep, name(ary[i]);
 276                                                 sep = ";"
 277                                         }
 278                                 }
 279                                 printf ">";
 280                                 $0 = substr($0, RSTART + RLENGTH, length($0) - RSTART - RLENGTH + 1);
 281                         }
 282                         print
 283                 }
 284         '
 285 }
 286
 287 nul_to_q () {
 288         perl -pe 'y/\000/Q/'
 289 }
 290
 291 q_to_nul () {
 292         perl -pe 'y/Q/\000/'
 293 }
 294
 295 q_to_cr () {
 296         tr Q '\015'
 297 }
 298
 299 q_to_tab () {
 300         tr Q '\011'
 301 }
 302
 303 append_cr () {
 304         sed -e 's/$/Q/' | tr Q '\015'
 305 }
 306
 307 remove_cr () {
 308         tr '\015' Q | sed -e 's/Q$//'
 309 }
 310
 311 test_tick () {
 312         if test -z "${test_tick+set}"
 313         then
 314                 test_tick=1112911993
 315         else
 316                 test_tick=$(($test_tick + 60))
 317         fi
 318         GIT_COMMITTER_DATE="$test_tick -0700"
 319         GIT_AUTHOR_DATE="$test_tick -0700"
 320         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 321 }
 322
 323 # Call test_commit with the arguments "<message> [<file> [<contents>]]"
 324 #
 325 # This will commit a file with the given contents and the given commit
 326 # message.  It will also add a tag with <message> as name.
 327 #
 328 # Both <file> and <contents> default to <message>.
 329
 330 test_commit () {
 331         file=${2:-"$1.t"}
 332         echo "${3-$1}" > "$file" &&
 333         git add "$file" &&
 334         test_tick &&
 335         git commit -m "$1" &&
 336         git tag "$1"
 337 }
 338
 339 # Call test_merge with the arguments "<message> <commit>", where <commit>
 340 # can be a tag pointing to the commit-to-merge.
 341
 342 test_merge () {
 343         test_tick &&
 344         git merge -m "$1" "$2" &&
 345         git tag "$1"
 346 }
 347
 348 # This function helps systems where core.filemode=false is set.
 349 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 350 # of a file in the working directory and add it to the index.
 351
 352 test_chmod () {
 353         chmod "$@" &&
 354         git update-index --add "--chmod=$@"
 355 }
 356
 357 # Use test_set_prereq to tell that a particular prerequisite is available.
 358 # The prerequisite can later be checked for in two ways:
 359 #
 360 # - Explicitly using test_have_prereq.
 361 #
 362 # - Implicitly by specifying the prerequisite tag in the calls to
 363 #   test_expect_{success,failure,code}.
 364 #
 365 # The single parameter is the prerequisite tag (a simple word, in all
 366 # capital letters by convention).
 367
 368 test_set_prereq () {
 369         satisfied="$satisfied$1 "
 370 }
 371 satisfied=" "
 372
 373 test_have_prereq () {
 374         # prerequisites can be concatenated with ','
 375         save_IFS=$IFS
 376         IFS=,
 377         set -- $*
 378         IFS=$save_IFS
 379
 380         total_prereq=0
 381         ok_prereq=0
 382         missing_prereq=
 383
 384         for prerequisite
 385         do
 386                 total_prereq=$(($total_prereq + 1))
 387                 case $satisfied in
 388                 *" $prerequisite "*)
 389                         ok_prereq=$(($ok_prereq + 1))
 390                         ;;
 391                 *)
 392                         # Keep a list of missing prerequisites
 393                         if test -z "$missing_prereq"
 394                         then
 395                                 missing_prereq=$prerequisite
 396                         else
 397                                 missing_prereq="$prerequisite,$missing_prereq"
 398                         fi
 399                 esac
 400         done
 401
 402         test $total_prereq = $ok_prereq
 403 }
 404
 405 # You are not expected to call test_ok_ and test_failure_ directly, use
 406 # the text_expect_* functions instead.
 407
 408 test_ok_ () {
 409         test_success=$(($test_success + 1))
 410         say_color "" "ok $test_count - $@"
 411 }
 412
 413 test_failure_ () {
 414         test_failure=$(($test_failure + 1))
 415         say_color error "not ok - $test_count $1"
 416         shift
 417         echo "$@" | sed -e 's/^/#       /'
 418         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 419 }
 420
 421 test_known_broken_ok_ () {
 422         test_fixed=$(($test_fixed+1))
 423         say_color "" "ok $test_count - $@ # TODO known breakage"
 424 }
 425
 426 test_known_broken_failure_ () {
 427         test_broken=$(($test_broken+1))
 428         say_color skip "not ok $test_count - $@ # TODO known breakage"
 429 }
 430
 431 test_debug () {
 432         test "$debug" = "" || eval "$1"
 433 }
 434
 435 test_run_ () {
 436         test_cleanup=:
 437         eval >&3 2>&4 "$1"
 438         eval_ret=$?
 439         eval >&3 2>&4 "$test_cleanup"
 440         if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"; then
 441                 echo ""
 442         fi
 443         return 0
 444 }
 445
 446 test_skip () {
 447         test_count=$(($test_count+1))
 448         to_skip=
 449         for skp in $GIT_SKIP_TESTS
 450         do
 451                 case $this_test.$test_count in
 452                 $skp)
 453                         to_skip=t
 454                         break
 455                 esac
 456         done
 457         if test -z "$to_skip" && test -n "$prereq" &&
 458            ! test_have_prereq "$prereq"
 459         then
 460                 to_skip=t
 461         fi
 462         case "$to_skip" in
 463         t)
 464                 of_prereq=
 465                 if test "$missing_prereq" != "$prereq"
 466                 then
 467                         of_prereq=" of $prereq"
 468                 fi
 469
 470                 say_color skip >&3 "skipping test: $@"
 471                 say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
 472                 : true
 473                 ;;
 474         *)
 475                 false
 476                 ;;
 477         esac
 478 }
 479
 480 test_expect_failure () {
 481         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 482         test "$#" = 2 ||
 483         error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 484         if ! test_skip "$@"
 485         then
 486                 say >&3 "checking known breakage: $2"
 487                 test_run_ "$2"
 488                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 489                 then
 490                         test_known_broken_ok_ "$1"
 491                 else
 492                         test_known_broken_failure_ "$1"
 493                 fi
 494         fi
 495         echo >&3 ""
 496 }
 497
 498 test_expect_success () {
 499         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 500         test "$#" = 2 ||
 501         error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 502         if ! test_skip "$@"
 503         then
 504                 say >&3 "expecting success: $2"
 505                 test_run_ "$2"
 506                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 507                 then
 508                         test_ok_ "$1"
 509                 else
 510                         test_failure_ "$@"
 511                 fi
 512         fi
 513         echo >&3 ""
 514 }
 515
 516 test_expect_code () {
 517         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 518         test "$#" = 3 ||
 519         error "bug in the test script: not 3 or 4 parameters to test-expect-code"
 520         if ! test_skip "$@"
 521         then
 522                 say >&3 "expecting exit code $1: $3"
 523                 test_run_ "$3"
 524                 if [ "$?" = 0 -a "$eval_ret" = "$1" ]
 525                 then
 526                         test_ok_ "$2"
 527                 else
 528                         test_failure_ "$@"
 529                 fi
 530         fi
 531         echo >&3 ""
 532 }
 533
 534 # test_external runs external test scripts that provide continuous
 535 # test output about their progress, and succeeds/fails on
 536 # zero/non-zero exit code.  It outputs the test output on stdout even
 537 # in non-verbose mode, and announces the external script with "# run
 538 # <n>: ..." before running it.  When providing relative paths, keep in
 539 # mind that all scripts run in "trash directory".
 540 # Usage: test_external description command arguments...
 541 # Example: test_external 'Perl API' perl ../path/to/test.pl
 542 test_external () {
 543         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 544         test "$#" = 3 ||
 545         error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 546         descr="$1"
 547         shift
 548         if ! test_skip "$descr" "$@"
 549         then
 550                 # Announce the script to reduce confusion about the
 551                 # test output that follows.
 552                 say_color "" "# run $test_count: $descr ($*)"
 553                 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 554                 # to be able to use them in script
 555                 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 556                 # Run command; redirect its stderr to &4 as in
 557                 # test_run_, but keep its stdout on our stdout even in
 558                 # non-verbose mode.
 559                 "$@" 2>&4
 560                 if [ "$?" = 0 ]
 561                 then
 562                         if test $test_external_has_tap -eq 0; then
 563                                 test_ok_ "$descr"
 564                         else
 565                                 say_color "" "# test_external test $descr was ok"
 566                                 test_success=$(($test_success + 1))
 567                         fi
 568                 else
 569                         if test $test_external_has_tap -eq 0; then
 570                                 test_failure_ "$descr" "$@"
 571                         else
 572                                 say_color error "# test_external test $descr failed: $@"
 573                                 test_failure=$(($test_failure + 1))
 574                         fi
 575                 fi
 576         fi
 577 }
 578
 579 # Like test_external, but in addition tests that the command generated
 580 # no output on stderr.
 581 test_external_without_stderr () {
 582         # The temporary file has no (and must have no) security
 583         # implications.
 584         tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
 585         stderr="$tmp/git-external-stderr.$$.tmp"
 586         test_external "$@" 4> "$stderr"
 587         [ -f "$stderr" ] || error "Internal error: $stderr disappeared."
 588         descr="no stderr: $1"
 589         shift
 590         say >&3 "# expecting no stderr from previous command"
 591         if [ ! -s "$stderr" ]; then
 592                 rm "$stderr"
 593
 594                 if test $test_external_has_tap -eq 0; then
 595                         test_ok_ "$descr"
 596                 else
 597                         say_color "" "# test_external_without_stderr test $descr was ok"
 598                         test_success=$(($test_success + 1))
 599                 fi
 600         else
 601                 if [ "$verbose" = t ]; then
 602                         output=`echo; echo "# Stderr is:"; cat "$stderr"`
 603                 else
 604                         output=
 605                 fi
 606                 # rm first in case test_failure exits.
 607                 rm "$stderr"
 608                 if test $test_external_has_tap -eq 0; then
 609                         test_failure_ "$descr" "$@" "$output"
 610                 else
 611                         say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 612                         test_failure=$(($test_failure + 1))
 613                 fi
 614         fi
 615 }
 616
 617 # debugging-friendly alternatives to "test [-f|-d|-e]"
 618 # The commands test the existence or non-existence of $1. $2 can be
 619 # given to provide a more precise diagnosis.
 620 test_path_is_file () {
 621         if ! [ -f "$1" ]
 622         then
 623                 echo "File $1 doesn't exist. $*"
 624                 false
 625         fi
 626 }
 627
 628 test_path_is_dir () {
 629         if ! [ -d "$1" ]
 630         then
 631                 echo "Directory $1 doesn't exist. $*"
 632                 false
 633         fi
 634 }
 635
 636 test_path_is_missing () {
 637         if [ -e "$1" ]
 638         then
 639                 echo "Path exists:"
 640                 ls -ld "$1"
 641                 if [ $# -ge 1 ]; then
 642                         echo "$*"
 643                 fi
 644                 false
 645         fi
 646 }
 647
 648
 649 # This is not among top-level (test_expect_success | test_expect_failure)
 650 # but is a prefix that can be used in the test script, like:
 651 #
 652 #       test_expect_success 'complain and die' '
 653 #           do something &&
 654 #           do something else &&
 655 #           test_must_fail git checkout ../outerspace
 656 #       '
 657 #
 658 # Writing this as "! git checkout ../outerspace" is wrong, because
 659 # the failure could be due to a segv.  We want a controlled failure.
 660
 661 test_must_fail () {
 662         "$@"
 663         exit_code=$?
 664         if test $exit_code = 0; then
 665                 echo >&2 "test_must_fail: command succeeded: $*"
 666                 return 1
 667         elif test $exit_code -gt 129 -a $exit_code -le 192; then
 668                 echo >&2 "test_must_fail: died by signal: $*"
 669                 return 1
 670         elif test $exit_code = 127; then
 671                 echo >&2 "test_must_fail: command not found: $*"
 672                 return 1
 673         fi
 674         return 0
 675 }
 676
 677 # Similar to test_must_fail, but tolerates success, too.  This is
 678 # meant to be used in contexts like:
 679 #
 680 #       test_expect_success 'some command works without configuration' '
 681 #               test_might_fail git config --unset all.configuration &&
 682 #               do something
 683 #       '
 684 #
 685 # Writing "git config --unset all.configuration || :" would be wrong,
 686 # because we want to notice if it fails due to segv.
 687
 688 test_might_fail () {
 689         "$@"
 690         exit_code=$?
 691         if test $exit_code -gt 129 -a $exit_code -le 192; then
 692                 echo >&2 "test_might_fail: died by signal: $*"
 693                 return 1
 694         elif test $exit_code = 127; then
 695                 echo >&2 "test_might_fail: command not found: $*"
 696                 return 1
 697         fi
 698         return 0
 699 }
 700
 701 # test_cmp is a helper function to compare actual and expected output.
 702 # You can use it like:
 703 #
 704 #       test_expect_success 'foo works' '
 705 #               echo expected >expected &&
 706 #               foo >actual &&
 707 #               test_cmp expected actual
 708 #       '
 709 #
 710 # This could be written as either "cmp" or "diff -u", but:
 711 # - cmp's output is not nearly as easy to read as diff -u
 712 # - not all diff versions understand "-u"
 713
 714 test_cmp() {
 715         $GIT_TEST_CMP "$@"
 716 }
 717
 718 # This function can be used to schedule some commands to be run
 719 # unconditionally at the end of the test to restore sanity:
 720 #
 721 #       test_expect_success 'test core.capslock' '
 722 #               git config core.capslock true &&
 723 #               test_when_finished "git config --unset core.capslock" &&
 724 #               hello world
 725 #       '
 726 #
 727 # That would be roughly equivalent to
 728 #
 729 #       test_expect_success 'test core.capslock' '
 730 #               git config core.capslock true &&
 731 #               hello world
 732 #               git config --unset core.capslock
 733 #       '
 734 #
 735 # except that the greeting and config --unset must both succeed for
 736 # the test to pass.
 737
 738 test_when_finished () {
 739         test_cleanup="{ $*
 740                 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 741 }
 742
 743 # Most tests can use the created repository, but some may need to create more.
 744 # Usage: test_create_repo <directory>
 745 test_create_repo () {
 746         test "$#" = 1 ||
 747         error "bug in the test script: not 1 parameter to test-create-repo"
 748         repo="$1"
 749         mkdir -p "$repo"
 750         (
 751                 cd "$repo" || error "Cannot setup test environment"
 752                 "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 753                 error "cannot run git init -- have you built things yet?"
 754                 mv .git/hooks .git/hooks-disabled
 755         ) || exit
 756 }
 757
 758 test_done () {
 759         GIT_EXIT_OK=t
 760
 761         if test -z "$HARNESS_ACTIVE"; then
 762                 test_results_dir="$TEST_DIRECTORY/test-results"
 763                 mkdir -p "$test_results_dir"
 764                 test_results_path="$test_results_dir/${0%.sh}-$$.counts"
 765
 766                 echo "total $test_count" >> $test_results_path
 767                 echo "success $test_success" >> $test_results_path
 768                 echo "fixed $test_fixed" >> $test_results_path
 769                 echo "broken $test_broken" >> $test_results_path
 770                 echo "failed $test_failure" >> $test_results_path
 771                 echo "" >> $test_results_path
 772         fi
 773
 774         if test "$test_fixed" != 0
 775         then
 776                 say_color pass "# fixed $test_fixed known breakage(s)"
 777         fi
 778         if test "$test_broken" != 0
 779         then
 780                 say_color error "# still have $test_broken known breakage(s)"
 781                 msg="remaining $(($test_count-$test_broken)) test(s)"
 782         else
 783                 msg="$test_count test(s)"
 784         fi
 785         case "$test_failure" in
 786         0)
 787                 # Maybe print SKIP message
 788                 [ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
 789
 790                 if test $test_external_has_tap -eq 0; then
 791                         say_color pass "# passed all $msg"
 792                         say "1..$test_count$skip_all"
 793                 fi
 794
 795                 test -d "$remove_trash" &&
 796                 cd "$(dirname "$remove_trash")" &&
 797                 rm -rf "$(basename "$remove_trash")"
 798
 799                 exit 0 ;;
 800
 801         *)
 802                 if test $test_external_has_tap -eq 0; then
 803                         say_color error "# failed $test_failure among $msg"
 804                         say "1..$test_count"
 805                 fi
 806
 807                 exit 1 ;;
 808
 809         esac
 810 }
 811
 812 # Test the binaries we have just built.  The tests are kept in
 813 # t/ subdirectory and are run in 'trash directory' subdirectory.
 814 if test -z "$TEST_DIRECTORY"
 815 then
 816         # We allow tests to override this, in case they want to run tests
 817         # outside of t/, e.g. for running tests on the test library
 818         # itself.
 819         TEST_DIRECTORY=$(pwd)
 820 fi
 821 GIT_BUILD_DIR="$TEST_DIRECTORY"/..
 822
 823 if test -n "$valgrind"
 824 then
 825         make_symlink () {
 826                 test -h "$2" &&
 827                 test "$1" = "$(readlink "$2")" || {
 828                         # be super paranoid
 829                         if mkdir "$2".lock
 830                         then
 831                                 rm -f "$2" &&
 832                                 ln -s "$1" "$2" &&
 833                                 rm -r "$2".lock
 834                         else
 835                                 while test -d "$2".lock
 836                                 do
 837                                         say "Waiting for lock on $2."
 838                                         sleep 1
 839                                 done
 840                         fi
 841                 }
 842         }
 843
 844         make_valgrind_symlink () {
 845                 # handle only executables
 846                 test -x "$1" || return
 847
 848                 base=$(basename "$1")
 849                 symlink_target=$GIT_BUILD_DIR/$base
 850                 # do not override scripts
 851                 if test -x "$symlink_target" &&
 852                     test ! -d "$symlink_target" &&
 853                     test "#!" != "$(head -c 2 < "$symlink_target")"
 854                 then
 855                         symlink_target=../valgrind.sh
 856                 fi
 857                 case "$base" in
 858                 *.sh|*.perl)
 859                         symlink_target=../unprocessed-script
 860                 esac
 861                 # create the link, or replace it if it is out of date
 862                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 863         }
 864
 865         # override all git executables in TEST_DIRECTORY/..
 866         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 867         mkdir -p "$GIT_VALGRIND"/bin
 868         for file in $GIT_BUILD_DIR/git* $GIT_BUILD_DIR/test-*
 869         do
 870                 make_valgrind_symlink $file
 871         done
 872         OLDIFS=$IFS
 873         IFS=:
 874         for path in $PATH
 875         do
 876                 ls "$path"/git-* 2> /dev/null |
 877                 while read file
 878                 do
 879                         make_valgrind_symlink "$file"
 880                 done
 881         done
 882         IFS=$OLDIFS
 883         PATH=$GIT_VALGRIND/bin:$PATH
 884         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 885         export GIT_VALGRIND
 886 elif test -n "$GIT_TEST_INSTALLED" ; then
 887         GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 888         error "Cannot run git from $GIT_TEST_INSTALLED."
 889         PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
 890         GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 891 else # normal case, use ../bin-wrappers only unless $with_dashes:
 892         git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
 893         if ! test -x "$git_bin_dir/git" ; then
 894                 if test -z "$with_dashes" ; then
 895                         say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
 896                 fi
 897                 with_dashes=t
 898         fi
 899         PATH="$git_bin_dir:$PATH"
 900         GIT_EXEC_PATH=$GIT_BUILD_DIR
 901         if test -n "$with_dashes" ; then
 902                 PATH="$GIT_BUILD_DIR:$PATH"
 903         fi
 904 fi
 905 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
 906 unset GIT_CONFIG
 907 GIT_CONFIG_NOSYSTEM=1
 908 GIT_CONFIG_NOGLOBAL=1
 909 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_CONFIG_NOGLOBAL
 910
 911 . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
 912
 913 if test -z "$GIT_TEST_CMP"
 914 then
 915         if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
 916         then
 917                 GIT_TEST_CMP="$DIFF -c"
 918         else
 919                 GIT_TEST_CMP="$DIFF -u"
 920         fi
 921 fi
 922
 923 GITPERLLIB="$GIT_BUILD_DIR"/perl/blib/lib:"$GIT_BUILD_DIR"/perl/blib/arch/auto/Git
 924 export GITPERLLIB
 925 test -d "$GIT_BUILD_DIR"/templates/blt || {
 926         error "You haven't built things yet, have you?"
 927 }
 928
 929 if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
 930 then
 931         GITPYTHONLIB="$GIT_BUILD_DIR/git_remote_helpers/build/lib"
 932         export GITPYTHONLIB
 933         test -d "$GIT_BUILD_DIR"/git_remote_helpers/build || {
 934                 error "You haven't built git_remote_helpers yet, have you?"
 935         }
 936 fi
 937
 938 if ! test -x "$GIT_BUILD_DIR"/test-chmtime; then
 939         echo >&2 'You need to build test-chmtime:'
 940         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 941         exit 1
 942 fi
 943
 944 # Test repository
 945 test="trash directory.$(basename "$0" .sh)"
 946 test -n "$root" && test="$root/$test"
 947 case "$test" in
 948 /*) TRASH_DIRECTORY="$test" ;;
 949  *) TRASH_DIRECTORY="$TEST_DIRECTORY/$test" ;;
 950 esac
 951 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
 952 rm -fr "$test" || {
 953         GIT_EXIT_OK=t
 954         echo >&5 "FATAL: Cannot prepare test area"
 955         exit 1
 956 }
 957
 958 test_create_repo "$test"
 959 # Use -P to resolve symlinks in our working directory so that the cwd
 960 # in subprocesses like git equals our $PWD (for pathname comparisons).
 961 cd -P "$test" || exit 1
 962
 963 HOME=$(pwd)
 964 export HOME
 965
 966 this_test=${0##*/}
 967 this_test=${this_test%%-*}
 968 for skp in $GIT_SKIP_TESTS
 969 do
 970         case "$this_test" in
 971         $skp)
 972                 say_color skip >&3 "skipping test $this_test altogether"
 973                 skip_all="skip all tests in $this_test"
 974                 test_done
 975         esac
 976 done
 977
 978 # Provide an implementation of the 'yes' utility
 979 yes () {
 980         if test $# = 0
 981         then
 982                 y=y
 983         else
 984                 y="$*"
 985         fi
 986
 987         while echo "$y"
 988         do
 989                 :
 990         done
 991 }
 992
 993 # Fix some commands on Windows
 994 case $(uname -s) in
 995 *MINGW*)
 996         # Windows has its own (incompatible) sort and find
 997         sort () {
 998                 /usr/bin/sort "$@"
 999         }
1000         find () {
1001                 /usr/bin/find "$@"
1002         }
1003         sum () {
1004                 md5sum "$@"
1005         }
1006         # git sees Windows-style pwd
1007         pwd () {
1008                 builtin pwd -W
1009         }
1010         # no POSIX permissions
1011         # backslashes in pathspec are converted to '/'
1012         # exec does not inherit the PID
1013         ;;
1014 *)
1015         test_set_prereq POSIXPERM
1016         test_set_prereq BSLASHPSPEC
1017         test_set_prereq EXECKEEPSPID
1018         ;;
1019 esac
1020
1021 test -z "$NO_PERL" && test_set_prereq PERL
1022 test -z "$NO_PYTHON" && test_set_prereq PYTHON
1023
1024 # test whether the filesystem supports symbolic links
1025 ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
1026 rm -f y
1027
1028 # When the tests are run as root, permission tests will report that
1029 # things are writable when they shouldn't be.
1030 test -w / || test_set_prereq SANITY