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Diffstat (limited to 't/README')
| -rw-r--r-- | t/README | 689 |
1 files changed, 657 insertions, 32 deletions
@@ -18,46 +18,184 @@ The easiest way to run tests is to say "make". This runs all the tests. *** t0000-basic.sh *** - * ok 1: .git/objects should be empty after git-init in an empty repo. - * ok 2: .git/objects should have 256 subdirectories. - * ok 3: git-update-index without --add should fail adding. + ok 1 - .git/objects should be empty after git init in an empty repo. + ok 2 - .git/objects should have 3 subdirectories. + ok 3 - success is reported like this ... - * ok 23: no diff after checkout and git-update-index --refresh. - * passed all 23 test(s) - *** t0100-environment-names.sh *** - * ok 1: using old names should issue warnings. - * ok 2: using old names but having new names should not issue warnings. - ... - -Or you can run each test individually from command line, like -this: - - $ sh ./t3001-ls-files-killed.sh - * ok 1: git-update-index --add to add various paths. - * ok 2: git-ls-files -k to show killed files. - * ok 3: validate git-ls-files -k output. - * passed all 3 test(s) + ok 43 - very long name in the index handled sanely + # fixed 1 known breakage(s) + # still have 1 known breakage(s) + # passed all remaining 42 test(s) + 1..43 + *** t0001-init.sh *** + ok 1 - plain + ok 2 - plain with GIT_WORK_TREE + ok 3 - plain bare + +Since the tests all output TAP (see http://testanything.org) they can +be run with any TAP harness. Here's an example of parallel testing +powered by a recent version of prove(1): + + $ prove --timer --jobs 15 ./t[0-9]*.sh + [19:17:33] ./t0005-signals.sh ................................... ok 36 ms + [19:17:33] ./t0022-crlf-rename.sh ............................... ok 69 ms + [19:17:33] ./t0024-crlf-archive.sh .............................. ok 154 ms + [19:17:33] ./t0004-unwritable.sh ................................ ok 289 ms + [19:17:33] ./t0002-gitfile.sh ................................... ok 480 ms + ===( 102;0 25/? 6/? 5/? 16/? 1/? 4/? 2/? 1/? 3/? 1... )=== + +prove and other harnesses come with a lot of useful options. The +--state option in particular is very useful: + + # Repeat until no more failures + $ prove -j 15 --state=failed,save ./t[0-9]*.sh + +You can give DEFAULT_TEST_TARGET=prove on the make command (or define it +in config.mak) to cause "make test" to run tests under prove. +GIT_PROVE_OPTS can be used to pass additional options, e.g. + + $ make DEFAULT_TEST_TARGET=prove GIT_PROVE_OPTS='--timer --jobs 16' test + +You can also run each test individually from command line, like this: + + $ sh ./t3010-ls-files-killed-modified.sh + ok 1 - git update-index --add to add various paths. + ok 2 - git ls-files -k to show killed files. + ok 3 - validate git ls-files -k output. + ok 4 - git ls-files -m to show modified files. + ok 5 - validate git ls-files -m output. + # passed all 5 test(s) + 1..5 You can pass --verbose (or -v), --debug (or -d), and --immediate -(or -i) command line argument to the test. +(or -i) command line argument to the test, or by setting GIT_TEST_OPTS +appropriately before running "make". +-v:: --verbose:: This makes the test more verbose. Specifically, the command being run and their output if any are also output. +--verbose-only=<pattern>:: + Like --verbose, but the effect is limited to tests with + numbers matching <pattern>. The number matched against is + simply the running count of the test within the file. + +-x:: + Turn on shell tracing (i.e., `set -x`) during the tests + themselves. Implies `--verbose`. Note that in non-bash shells, + this can cause failures in some tests which redirect and test + the output of shell functions. Use with caution. + +-d:: --debug:: This may help the person who is developing a new test. It causes the command defined with test_debug to run. + The "trash" directory (used to store all temporary data + during testing) is not deleted even if there are no + failed tests so that you can inspect its contents after + the test finished. +-i:: --immediate:: This causes the test to immediately exit upon the first - failed test. + failed test. Cleanup commands requested with + test_when_finished are not executed if the test failed, + in order to keep the state for inspection by the tester + to diagnose the bug. +-l:: --long-tests:: This causes additional long-running tests to be run (where available), for more exhaustive testing. +-r:: +--run=<test-selector>:: + Run only the subset of tests indicated by + <test-selector>. See section "Skipping Tests" below for + <test-selector> syntax. + +--valgrind=<tool>:: + Execute all Git binaries under valgrind tool <tool> and exit + with status 126 on errors (just like regular tests, this will + only stop the test script when running under -i). + + Since it makes no sense to run the tests with --valgrind and + not see any output, this option implies --verbose. For + convenience, it also implies --tee. + + <tool> defaults to 'memcheck', just like valgrind itself. + Other particularly useful choices include 'helgrind' and + 'drd', but you may use any tool recognized by your valgrind + installation. + + As a special case, <tool> can be 'memcheck-fast', which uses + memcheck but disables --track-origins. Use this if you are + running tests in bulk, to see if there are _any_ memory + issues. + + Note that memcheck is run with the option --leak-check=no, + as the git process is short-lived and some errors are not + interesting. In order to run a single command under the same + conditions manually, you should set GIT_VALGRIND to point to + the 't/valgrind/' directory and use the commands under + 't/valgrind/bin/'. + +--valgrind-only=<pattern>:: + Like --valgrind, but the effect is limited to tests with + numbers matching <pattern>. The number matched against is + simply the running count of the test within the file. + +--tee:: + In addition to printing the test output to the terminal, + write it to files named 't/test-results/$TEST_NAME.out'. + As the names depend on the tests' file names, it is safe to + run the tests with this option in parallel. + +--verbose-log:: + Write verbose output to the same logfile as `--tee`, but do + _not_ write it to stdout. Unlike `--tee --verbose`, this option + is safe to use when stdout is being consumed by a TAP parser + like `prove`. Implies `--tee` and `--verbose`. + +--with-dashes:: + By default tests are run without dashed forms of + commands (like git-commit) in the PATH (it only uses + wrappers from ../bin-wrappers). Use this option to include + the build directory (..) in the PATH, which contains all + the dashed forms of commands. This option is currently + implied by other options like --valgrind and + GIT_TEST_INSTALLED. + +--root=<directory>:: + Create "trash" directories used to store all temporary data during + testing under <directory>, instead of the t/ directory. + Using this option with a RAM-based filesystem (such as tmpfs) + can massively speed up the test suite. + +--chain-lint:: +--no-chain-lint:: + If --chain-lint is enabled, the test harness will check each + test to make sure that it properly "&&-chains" all commands (so + that a failure in the middle does not go unnoticed by the final + exit code of the test). This check is performed in addition to + running the tests themselves. You may also enable or disable + this feature by setting the GIT_TEST_CHAIN_LINT environment + variable to "1" or "0", respectively. + +You can also set the GIT_TEST_INSTALLED environment variable to +the bindir of an existing git installation to test that installation. +You still need to have built this git sandbox, from which various +test-* support programs, templates, and perl libraries are used. +If your installed git is incomplete, it will silently test parts of +your built version instead. + +When using GIT_TEST_INSTALLED, you can also set GIT_TEST_EXEC_PATH to +override the location of the dashed-form subcommands (what +GIT_EXEC_PATH would be used for during normal operation). +GIT_TEST_EXEC_PATH defaults to `$GIT_TEST_INSTALLED/git --exec-path`. + Skipping Tests -------------- @@ -81,10 +219,77 @@ and either can match the "t[0-9]{4}" part to skip the whole test, or t[0-9]{4} followed by ".$number" to say which particular test to skip. -Note that some tests in the existing test suite rely on previous -test item, so you cannot arbitrarily disable one and expect the -remainder of test to check what the test originally was intended -to check. +For an individual test suite --run could be used to specify that +only some tests should be run or that some tests should be +excluded from a run. + +The argument for --run is a list of individual test numbers or +ranges with an optional negation prefix that define what tests in +a test suite to include in the run. A range is two numbers +separated with a dash and matches a range of tests with both ends +been included. You may omit the first or the second number to +mean "from the first test" or "up to the very last test" +respectively. + +Optional prefix of '!' means that the test or a range of tests +should be excluded from the run. + +If --run starts with an unprefixed number or range the initial +set of tests to run is empty. If the first item starts with '!' +all the tests are added to the initial set. After initial set is +determined every test number or range is added or excluded from +the set one by one, from left to right. + +Individual numbers or ranges could be separated either by a space +or a comma. + +For example, to run only tests up to a specific test (21), one +could do this: + + $ sh ./t9200-git-cvsexport-commit.sh --run='1-21' + +or this: + + $ sh ./t9200-git-cvsexport-commit.sh --run='-21' + +Common case is to run several setup tests (1, 2, 3) and then a +specific test (21) that relies on that setup: + + $ sh ./t9200-git-cvsexport-commit.sh --run='1 2 3 21' + +or: + + $ sh ./t9200-git-cvsexport-commit.sh --run=1,2,3,21 + +or: + + $ sh ./t9200-git-cvsexport-commit.sh --run='-3 21' + +As noted above, the test set is built going though items left to +right, so this: + + $ sh ./t9200-git-cvsexport-commit.sh --run='1-4 !3' + +will run tests 1, 2, and 4. Items that comes later have higher +precedence. It means that this: + + $ sh ./t9200-git-cvsexport-commit.sh --run='!3 1-4' + +would just run tests from 1 to 4, including 3. + +You may use negation with ranges. The following will run all +test in the test suite except from 7 up to 11: + + $ sh ./t9200-git-cvsexport-commit.sh --run='!7-11' + +Some tests in a test suite rely on the previous tests performing +certain actions, specifically some tests are designated as +"setup" test, so you cannot _arbitrarily_ disable one test and +expect the rest to function correctly. + +--run is mostly useful when you want to focus on a specific test +and know what setup is needed for it. Or when you want to run +everything up to a certain test. Naming Tests @@ -117,7 +322,7 @@ we are testing. If you create files under t/ directory (i.e. here) that is not the top-level test script, never name the file to match the above pattern. The Makefile here considers all such files as the -top-level test script and tries to run all of them. A care is +top-level test script and tries to run all of them. Care is especially needed if you are creating a common test library file, similar to test-lib.sh, because such a library file may not be suitable for standalone execution. @@ -154,15 +359,157 @@ This test harness library does the following things: - If the script is invoked with command line argument --help (or -h), it shows the test_description and exits. - - Creates an empty test directory with an empty .git/objects - database and chdir(2) into it. This directory is 't/trash directory' - if you must know, but I do not think you care. + - Creates an empty test directory with an empty .git/objects database + and chdir(2) into it. This directory is 't/trash + directory.$test_name_without_dotsh', with t/ subject to change by + the --root option documented above. - Defines standard test helper functions for your scripts to use. These functions are designed to make all scripts behave consistently when command line arguments --verbose (or -v), --debug (or -d), and --immediate (or -i) is given. +Do's, don'ts & things to keep in mind +------------------------------------- + +Here are a few examples of things you probably should and shouldn't do +when writing tests. + +Do: + + - Put all code inside test_expect_success and other assertions. + + Even code that isn't a test per se, but merely some setup code + should be inside a test assertion. + + - Chain your test assertions + + Write test code like this: + + git merge foo && + git push bar && + test ... + + Instead of: + + git merge hla + git push gh + test ... + + That way all of the commands in your tests will succeed or fail. If + you must ignore the return value of something, consider using a + helper function (e.g. use sane_unset instead of unset, in order + to avoid unportable return value for unsetting a variable that was + already unset), or prepending the command with test_might_fail or + test_must_fail. + + - Check the test coverage for your tests. See the "Test coverage" + below. + + Don't blindly follow test coverage metrics; if a new function you added + doesn't have any coverage, then you're probably doing something wrong, + but having 100% coverage doesn't necessarily mean that you tested + everything. + + Tests that are likely to smoke out future regressions are better + than tests that just inflate the coverage metrics. + + - When a test checks for an absolute path that a git command generated, + construct the expected value using $(pwd) rather than $PWD, + $TEST_DIRECTORY, or $TRASH_DIRECTORY. It makes a difference on + Windows, where the shell (MSYS bash) mangles absolute path names. + For details, see the commit message of 4114156ae9. + +Don't: + + - exit() within a <script> part. + + The harness will catch this as a programming error of the test. + Use test_done instead if you need to stop the tests early (see + "Skipping tests" below). + + - use '! git cmd' when you want to make sure the git command exits + with failure in a controlled way by calling "die()". Instead, + use 'test_must_fail git cmd'. This will signal a failure if git + dies in an unexpected way (e.g. segfault). + + On the other hand, don't use test_must_fail for running regular + platform commands; just use '! cmd'. We are not in the business + of verifying that the world given to us sanely works. + + - use perl without spelling it as "$PERL_PATH". This is to help our + friends on Windows where the platform Perl often adds CR before + the end of line, and they bundle Git with a version of Perl that + does not do so, whose path is specified with $PERL_PATH. Note that we + provide a "perl" function which uses $PERL_PATH under the hood, so + you do not need to worry when simply running perl in the test scripts + (but you do, for example, on a shebang line or in a sub script + created via "write_script"). + + - use sh without spelling it as "$SHELL_PATH", when the script can + be misinterpreted by broken platform shell (e.g. Solaris). + + - chdir around in tests. It is not sufficient to chdir to + somewhere and then chdir back to the original location later in + the test, as any intermediate step can fail and abort the test, + causing the next test to start in an unexpected directory. Do so + inside a subshell if necessary. + + - Break the TAP output + + The raw output from your test may be interpreted by a TAP harness. TAP + harnesses will ignore everything they don't know about, but don't step + on their toes in these areas: + + - Don't print lines like "$x..$y" where $x and $y are integers. + + - Don't print lines that begin with "ok" or "not ok". + + TAP harnesses expect a line that begins with either "ok" and "not + ok" to signal a test passed or failed (and our harness already + produces such lines), so your script shouldn't emit such lines to + their output. + + You can glean some further possible issues from the TAP grammar + (see https://metacpan.org/pod/TAP::Parser::Grammar#TAP-GRAMMAR) + but the best indication is to just run the tests with prove(1), + it'll complain if anything is amiss. + +Keep in mind: + + - Inside the <script> part, the standard output and standard error + streams are discarded, and the test harness only reports "ok" or + "not ok" to the end user running the tests. Under --verbose, they + are shown to help debugging the tests. + + +Skipping tests +-------------- + +If you need to skip tests you should do so by using the three-arg form +of the test_* functions (see the "Test harness library" section +below), e.g.: + + test_expect_success PERL 'I need Perl' ' + perl -e "hlagh() if unf_unf()" + ' + +The advantage of skipping tests like this is that platforms that don't +have the PERL and other optional dependencies get an indication of how +many tests they're missing. + +If the test code is too hairy for that (i.e. does a lot of setup work +outside test assertions) you can also skip all remaining tests by +setting skip_all and immediately call test_done: + + if ! test_have_prereq PERL + then + skip_all='skipping perl interface tests, perl not available' + test_done + fi + +The string you give to skip_all will be used as an explanation for why +the test was skipped. End with test_done ------------------ @@ -178,9 +525,9 @@ Test harness library There are a handful helper functions defined in the test harness library for your script to use. - - test_expect_success <message> <script> + - test_expect_success [<prereq>] <message> <script> - This takes two strings as parameter, and evaluates the + Usually takes two strings as parameters, and evaluates the <script>. If it yields success, test is considered successful. <message> should state what it is testing. @@ -190,7 +537,20 @@ library for your script to use. 'git-write-tree should be able to write an empty tree.' \ 'tree=$(git-write-tree)' - - test_expect_failure <message> <script> + If you supply three parameters the first will be taken to be a + prerequisite; see the test_set_prereq and test_have_prereq + documentation below: + + test_expect_success TTY 'git --paginate rev-list uses a pager' \ + ' ... ' + + You can also supply a comma-separated list of prerequisites, in the + rare case where your test depends on more than one: + + test_expect_success PERL,PYTHON 'yo dawg' \ + ' test $(perl -E 'print eval "1 +" . qx[python -c "print 2"]') == "4" ' + + - test_expect_failure [<prereq>] <message> <script> This is NOT the opposite of test_expect_success, but is used to mark a test that demonstrates a known breakage. Unlike @@ -199,6 +559,9 @@ library for your script to use. success and "still broken" on failure. Failures from these tests won't cause -i (immediate) to stop. + Like test_expect_success this function can optionally use a three + argument invocation with a prerequisite as the first argument. + - test_debug <script> This takes a single argument, <script>, and evaluates it only @@ -206,6 +569,11 @@ library for your script to use. argument. This is primarily meant for use during the development of a new test script. + - debug <git-command> + + Run a git command inside a debugger. This is primarily meant for + use when debugging a failing test script. + - test_done Your test script must have test_done at the end. Its purpose @@ -215,7 +583,7 @@ library for your script to use. - test_tick Make commit and tag names consistent by setting the author and - committer times to defined stated. Subsequent calls will + committer times to defined state. Subsequent calls will advance the times by a fixed amount. - test_commit <message> [<filename> [<contents>]] @@ -231,6 +599,224 @@ library for your script to use. Merges the given rev using the given message. Like test_commit, creates a tag and calls test_tick before committing. + - test_set_prereq <prereq> + + Set a test prerequisite to be used later with test_have_prereq. The + test-lib will set some prerequisites for you, see the + "Prerequisites" section below for a full list of these. + + Others you can set yourself and use later with either + test_have_prereq directly, or the three argument invocation of + test_expect_success and test_expect_failure. + + - test_have_prereq <prereq> + + Check if we have a prerequisite previously set with test_set_prereq. + The most common way to use this explicitly (as opposed to the + implicit use when an argument is passed to test_expect_*) is to skip + all the tests at the start of the test script if we don't have some + essential prerequisite: + + if ! test_have_prereq PERL + then + skip_all='skipping perl interface tests, perl not available' + test_done + fi + + - test_external [<prereq>] <message> <external> <script> + + Execute a <script> with an <external> interpreter (like perl). This + was added for tests like t9700-perl-git.sh which do most of their + work in an external test script. + + test_external \ + 'GitwebCache::*FileCache*' \ + perl "$TEST_DIRECTORY"/t9503/test_cache_interface.pl + + If the test is outputting its own TAP you should set the + test_external_has_tap variable somewhere before calling the first + test_external* function. See t9700-perl-git.sh for an example. + + # The external test will outputs its own plan + test_external_has_tap=1 + + - test_external_without_stderr [<prereq>] <message> <external> <script> + + Like test_external but fail if there's any output on stderr, + instead of checking the exit code. + + test_external_without_stderr \ + 'Perl API' \ + perl "$TEST_DIRECTORY"/t9700/test.pl + + - test_expect_code <exit-code> <command> + + Run a command and ensure that it exits with the given exit code. + For example: + + test_expect_success 'Merge with d/f conflicts' ' + test_expect_code 1 git merge "merge msg" B master + ' + + - test_must_fail <git-command> + + Run a git command and ensure it fails in a controlled way. Use + this instead of "! <git-command>". When git-command dies due to a + segfault, test_must_fail diagnoses it as an error; "! <git-command>" + treats it as just another expected failure, which would let such a + bug go unnoticed. + + - test_might_fail <git-command> + + Similar to test_must_fail, but tolerate success, too. Use this + instead of "<git-command> || :" to catch failures due to segv. + + - test_cmp <expected> <actual> + + Check whether the content of the <actual> file matches the + <expected> file. This behaves like "cmp" but produces more + helpful output when the test is run with "-v" option. + + - test_line_count (= | -lt | -ge | ...) <length> <file> + + Check whether a file has the length it is expected to. + + - test_path_is_file <path> [<diagnosis>] + test_path_is_dir <path> [<diagnosis>] + test_path_is_missing <path> [<diagnosis>] + + Check if the named path is a file, if the named path is a + directory, or if the named path does not exist, respectively, + and fail otherwise, showing the <diagnosis> text. + + - test_when_finished <script> + + Prepend <script> to a list of commands to run to clean up + at the end of the current test. If some clean-up command + fails, the test will not pass. + + Example: + + test_expect_success 'branch pointing to non-commit' ' + git rev-parse HEAD^{tree} >.git/refs/heads/invalid && + test_when_finished "git update-ref -d refs/heads/invalid" && + ... + ' + + - test_write_lines <lines> + + Write <lines> on standard output, one line per argument. + Useful to prepare multi-line files in a compact form. + + Example: + + test_write_lines a b c d e f g >foo + + Is a more compact equivalent of: + cat >foo <<-EOF + a + b + c + d + e + f + g + EOF + + + - test_pause + + This command is useful for writing and debugging tests and must be + removed before submitting. It halts the execution of the test and + spawns a shell in the trash directory. Exit the shell to continue + the test. Example: + + test_expect_success 'test' ' + git do-something >actual && + test_pause && + test_cmp expected actual + ' + + - test_ln_s_add <path1> <path2> + + This function helps systems whose filesystem does not support symbolic + links. Use it to add a symbolic link entry to the index when it is not + important that the file system entry is a symbolic link, i.e., instead + of the sequence + + ln -s foo bar && + git add bar + + Sometimes it is possible to split a test in a part that does not need + the symbolic link in the file system and a part that does; then only + the latter part need be protected by a SYMLINKS prerequisite (see below). + +Prerequisites +------------- + +These are the prerequisites that the test library predefines with +test_have_prereq. + +See the prereq argument to the test_* functions in the "Test harness +library" section above and the "test_have_prereq" function for how to +use these, and "test_set_prereq" for how to define your own. + + - PYTHON + + Git wasn't compiled with NO_PYTHON=YesPlease. Wrap any tests that + need Python with this. + + - PERL + + Git wasn't compiled with NO_PERL=YesPlease. + + Even without the PERL prerequisite, tests can assume there is a + usable perl interpreter at $PERL_PATH, though it need not be + particularly modern. + + - POSIXPERM + + The filesystem supports POSIX style permission bits. + + - BSLASHPSPEC + + Backslashes in pathspec are not directory separators. This is not + set on Windows. See 6fd1106a for details. + + - EXECKEEPSPID + + The process retains the same pid across exec(2). See fb9a2bea for + details. + + - PIPE + + The filesystem we're on supports creation of FIFOs (named pipes) + via mkfifo(1). + + - SYMLINKS + + The filesystem we're on supports symbolic links. E.g. a FAT + filesystem doesn't support these. See 704a3143 for details. + + - SANITY + + Test is not run by root user, and an attempt to write to an + unwritable file is expected to fail correctly. + + - LIBPCRE + + Git was compiled with USE_LIBPCRE=YesPlease. Wrap any tests + that use git-grep --perl-regexp or git-grep -P in these. + + - CASE_INSENSITIVE_FS + + Test is run on a case insensitive file system. + + - UTF8_NFD_TO_NFC + + Test is run on a filesystem which converts decomposed utf-8 (nfd) + to precomposed utf-8 (nfc). + Tips for Writing Tests ---------------------- @@ -257,3 +843,42 @@ the purpose of t0000-basic.sh, which is to isolate that level of validation in one place. Your test also ends up needing updating when such a change to the internal happens, so do _not_ do it and leave the low level of validation to t0000-basic.sh. + +Test coverage +------------- + +You can use the coverage tests to find code paths that are not being +used or properly exercised yet. + +To do that, run the coverage target at the top-level (not in the t/ +directory): + + make coverage + +That'll compile Git with GCC's coverage arguments, and generate a test +report with gcov after the tests finish. Running the coverage tests +can take a while, since running the tests in parallel is incompatible +with GCC's coverage mode. + +After the tests have run you can generate a list of untested +functions: + + make coverage-untested-functions + +You can also generate a detailed per-file HTML report using the +Devel::Cover module. To install it do: + + # On Debian or Ubuntu: + sudo aptitude install libdevel-cover-perl + + # From the CPAN with cpanminus + curl -L http://cpanmin.us | perl - --sudo --self-upgrade + cpanm --sudo Devel::Cover + +Then, at the top-level: + + make cover_db_html + +That'll generate a detailed cover report in the "cover_db_html" +directory, which you can then copy to a webserver, or inspect locally +in a browser. |