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Core GIT Tests
==============
This directory holds many test scripts for core GIT tools. The
first part of this short document describes how to run the tests
and read their output.
When fixing the tools or adding enhancements, you are strongly
encouraged to add tests in this directory to cover what you are
trying to fix or enhance. The later part of this short document
describes how your test scripts should be organized.
Running Tests
-------------
The easiest way to run tests is to say "make". This runs all
the tests.
*** t0000-basic.sh ***
test-lib: Adjust output to be valid TAP format TAP, the Test Anything Protocol, is a simple text-based interface between testing modules in a test harness. test-lib.sh's output was already very close to being valid TAP. This change brings it all the way there. Before: $ ./t0005-signals.sh * ok 1: sigchain works * passed all 1 test(s) And after: $ ./t0005-signals.sh ok 1 - sigchain works # passed all 1 test(s) 1..1 The advantage of using TAP is that any program that reads the format (a "test harness") can run the tests. The most popular of these is the prove(1) utility that comes with Perl. It can run tests in parallel, display colored output, format the output to console, file, HTML etc., and much more. An example: $ prove ./t0005-signals.sh ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.01 cusr 0.02 csys = 0.06 CPU) Result: PASS prove(1) gives you human readable output without being too verbose. Running the test suite in parallel with `make test -j15` produces a flood of text. Running them with `prove -j 15 ./t[0-9]*.sh` makes it easy to follow what's going on. All this patch does is re-arrange the output a bit so that it conforms with the TAP spec, everything that the test suite did before continues to work. That includes aggregating results in t/test-results/, the --verbose, --debug and other options for tests, and the test color output. TAP harnesses ignore everything that they don't know about, so running the tests with --verbose works: $ prove ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Terminated ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.01 sys + 0.01 cusr 0.01 csys = 0.05 CPU) Result: PASS Just supply the -v option to prove itself to get all the verbose output that it suppresses: $ prove -v ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Initialized empty Git repository in /home/avar/g/git/t/trash directory.t0005-signals/.git/ expecting success: test-sigchain >actual case "$?" in 143) true ;; # POSIX w/ SIGTERM=15 3) true ;; # Windows *) false ;; esac && test_cmp expect actual Terminated ok 1 - sigchain works # passed all 1 test(s) 1..1 ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.01 cusr 0.01 csys = 0.04 CPU) Result: PASS As a further example, consider this test script that uses a lot of test-lib.sh features by Jakub Narebski: #!/bin/sh test_description='this is a sample test. This test is here to see various test outputs.' . ./test-lib.sh say 'diagnostic message' test_expect_success 'true test' 'true' test_expect_success 'false test' 'false' test_expect_failure 'true test (todo)' 'true' test_expect_failure 'false test (todo)' 'false' test_debug 'echo "debug message"' test_done The output of that was previously: * diagnostic message # yellow * ok 1: true test * FAIL 2: false test # bold red false * FIXED 3: true test (todo) * still broken 4: false test (todo) # bold green * fixed 1 known breakage(s) # green * still have 1 known breakage(s) # bold red * failed 1 among remaining 3 test(s) # bold red But is now: diagnostic message # yellow ok 1 - true test not ok - 2 false test # bold red # false ok 3 - true test (todo) # TODO known breakage not ok 4 - false test (todo) # TODO known breakage # bold green # fixed 1 known breakage(s) # green # still have 1 known breakage(s) # bold red # failed 1 among remaining 3 test(s) # bold red 1..4 All the coloring is preserved when the test is run manually. Under prove(1) the test performs as expected, even with --debug and --verbose options: $ prove ./example.sh :: --debug --verbose ./example.sh .. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/4 subtests (1 TODO test unexpectedly succeeded) Test Summary Report ------------------- ./example.sh (Wstat: 256 Tests: 4 Failed: 1) Failed test: 2 TODO passed: 3 Non-zero exit status: 1 Files=1, Tests=4, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.00 cusr 0.01 csys = 0.03 CPU) Result: FAIL The TAP harness itself doesn't get confused by the color output, they aren't used by test-lib.sh stdout isn't open to a terminal (test -t 1). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-06-24 21:52:12 +00:00
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
...
test-lib: Adjust output to be valid TAP format TAP, the Test Anything Protocol, is a simple text-based interface between testing modules in a test harness. test-lib.sh's output was already very close to being valid TAP. This change brings it all the way there. Before: $ ./t0005-signals.sh * ok 1: sigchain works * passed all 1 test(s) And after: $ ./t0005-signals.sh ok 1 - sigchain works # passed all 1 test(s) 1..1 The advantage of using TAP is that any program that reads the format (a "test harness") can run the tests. The most popular of these is the prove(1) utility that comes with Perl. It can run tests in parallel, display colored output, format the output to console, file, HTML etc., and much more. An example: $ prove ./t0005-signals.sh ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.01 cusr 0.02 csys = 0.06 CPU) Result: PASS prove(1) gives you human readable output without being too verbose. Running the test suite in parallel with `make test -j15` produces a flood of text. Running them with `prove -j 15 ./t[0-9]*.sh` makes it easy to follow what's going on. All this patch does is re-arrange the output a bit so that it conforms with the TAP spec, everything that the test suite did before continues to work. That includes aggregating results in t/test-results/, the --verbose, --debug and other options for tests, and the test color output. TAP harnesses ignore everything that they don't know about, so running the tests with --verbose works: $ prove ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Terminated ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.01 sys + 0.01 cusr 0.01 csys = 0.05 CPU) Result: PASS Just supply the -v option to prove itself to get all the verbose output that it suppresses: $ prove -v ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Initialized empty Git repository in /home/avar/g/git/t/trash directory.t0005-signals/.git/ expecting success: test-sigchain >actual case "$?" in 143) true ;; # POSIX w/ SIGTERM=15 3) true ;; # Windows *) false ;; esac && test_cmp expect actual Terminated ok 1 - sigchain works # passed all 1 test(s) 1..1 ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.01 cusr 0.01 csys = 0.04 CPU) Result: PASS As a further example, consider this test script that uses a lot of test-lib.sh features by Jakub Narebski: #!/bin/sh test_description='this is a sample test. This test is here to see various test outputs.' . ./test-lib.sh say 'diagnostic message' test_expect_success 'true test' 'true' test_expect_success 'false test' 'false' test_expect_failure 'true test (todo)' 'true' test_expect_failure 'false test (todo)' 'false' test_debug 'echo "debug message"' test_done The output of that was previously: * diagnostic message # yellow * ok 1: true test * FAIL 2: false test # bold red false * FIXED 3: true test (todo) * still broken 4: false test (todo) # bold green * fixed 1 known breakage(s) # green * still have 1 known breakage(s) # bold red * failed 1 among remaining 3 test(s) # bold red But is now: diagnostic message # yellow ok 1 - true test not ok - 2 false test # bold red # false ok 3 - true test (todo) # TODO known breakage not ok 4 - false test (todo) # TODO known breakage # bold green # fixed 1 known breakage(s) # green # still have 1 known breakage(s) # bold red # failed 1 among remaining 3 test(s) # bold red 1..4 All the coloring is preserved when the test is run manually. Under prove(1) the test performs as expected, even with --debug and --verbose options: $ prove ./example.sh :: --debug --verbose ./example.sh .. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/4 subtests (1 TODO test unexpectedly succeeded) Test Summary Report ------------------- ./example.sh (Wstat: 256 Tests: 4 Failed: 1) Failed test: 2 TODO passed: 3 Non-zero exit status: 1 Files=1, Tests=4, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.00 cusr 0.01 csys = 0.03 CPU) Result: FAIL The TAP harness itself doesn't get confused by the color output, they aren't used by test-lib.sh stdout isn't open to a terminal (test -t 1). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-06-24 21:52:12 +00:00
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
test-lib: Adjust output to be valid TAP format TAP, the Test Anything Protocol, is a simple text-based interface between testing modules in a test harness. test-lib.sh's output was already very close to being valid TAP. This change brings it all the way there. Before: $ ./t0005-signals.sh * ok 1: sigchain works * passed all 1 test(s) And after: $ ./t0005-signals.sh ok 1 - sigchain works # passed all 1 test(s) 1..1 The advantage of using TAP is that any program that reads the format (a "test harness") can run the tests. The most popular of these is the prove(1) utility that comes with Perl. It can run tests in parallel, display colored output, format the output to console, file, HTML etc., and much more. An example: $ prove ./t0005-signals.sh ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.01 cusr 0.02 csys = 0.06 CPU) Result: PASS prove(1) gives you human readable output without being too verbose. Running the test suite in parallel with `make test -j15` produces a flood of text. Running them with `prove -j 15 ./t[0-9]*.sh` makes it easy to follow what's going on. All this patch does is re-arrange the output a bit so that it conforms with the TAP spec, everything that the test suite did before continues to work. That includes aggregating results in t/test-results/, the --verbose, --debug and other options for tests, and the test color output. TAP harnesses ignore everything that they don't know about, so running the tests with --verbose works: $ prove ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Terminated ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.01 sys + 0.01 cusr 0.01 csys = 0.05 CPU) Result: PASS Just supply the -v option to prove itself to get all the verbose output that it suppresses: $ prove -v ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Initialized empty Git repository in /home/avar/g/git/t/trash directory.t0005-signals/.git/ expecting success: test-sigchain >actual case "$?" in 143) true ;; # POSIX w/ SIGTERM=15 3) true ;; # Windows *) false ;; esac && test_cmp expect actual Terminated ok 1 - sigchain works # passed all 1 test(s) 1..1 ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.01 cusr 0.01 csys = 0.04 CPU) Result: PASS As a further example, consider this test script that uses a lot of test-lib.sh features by Jakub Narebski: #!/bin/sh test_description='this is a sample test. This test is here to see various test outputs.' . ./test-lib.sh say 'diagnostic message' test_expect_success 'true test' 'true' test_expect_success 'false test' 'false' test_expect_failure 'true test (todo)' 'true' test_expect_failure 'false test (todo)' 'false' test_debug 'echo "debug message"' test_done The output of that was previously: * diagnostic message # yellow * ok 1: true test * FAIL 2: false test # bold red false * FIXED 3: true test (todo) * still broken 4: false test (todo) # bold green * fixed 1 known breakage(s) # green * still have 1 known breakage(s) # bold red * failed 1 among remaining 3 test(s) # bold red But is now: diagnostic message # yellow ok 1 - true test not ok - 2 false test # bold red # false ok 3 - true test (todo) # TODO known breakage not ok 4 - false test (todo) # TODO known breakage # bold green # fixed 1 known breakage(s) # green # still have 1 known breakage(s) # bold red # failed 1 among remaining 3 test(s) # bold red 1..4 All the coloring is preserved when the test is run manually. Under prove(1) the test performs as expected, even with --debug and --verbose options: $ prove ./example.sh :: --debug --verbose ./example.sh .. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/4 subtests (1 TODO test unexpectedly succeeded) Test Summary Report ------------------- ./example.sh (Wstat: 256 Tests: 4 Failed: 1) Failed test: 2 TODO passed: 3 Non-zero exit status: 1 Files=1, Tests=4, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.00 cusr 0.01 csys = 0.03 CPU) Result: FAIL The TAP harness itself doesn't get confused by the color output, they aren't used by test-lib.sh stdout isn't open to a terminal (test -t 1). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-06-24 21:52:12 +00:00
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
test-lib: Adjust output to be valid TAP format TAP, the Test Anything Protocol, is a simple text-based interface between testing modules in a test harness. test-lib.sh's output was already very close to being valid TAP. This change brings it all the way there. Before: $ ./t0005-signals.sh * ok 1: sigchain works * passed all 1 test(s) And after: $ ./t0005-signals.sh ok 1 - sigchain works # passed all 1 test(s) 1..1 The advantage of using TAP is that any program that reads the format (a "test harness") can run the tests. The most popular of these is the prove(1) utility that comes with Perl. It can run tests in parallel, display colored output, format the output to console, file, HTML etc., and much more. An example: $ prove ./t0005-signals.sh ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.01 cusr 0.02 csys = 0.06 CPU) Result: PASS prove(1) gives you human readable output without being too verbose. Running the test suite in parallel with `make test -j15` produces a flood of text. Running them with `prove -j 15 ./t[0-9]*.sh` makes it easy to follow what's going on. All this patch does is re-arrange the output a bit so that it conforms with the TAP spec, everything that the test suite did before continues to work. That includes aggregating results in t/test-results/, the --verbose, --debug and other options for tests, and the test color output. TAP harnesses ignore everything that they don't know about, so running the tests with --verbose works: $ prove ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Terminated ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.01 sys + 0.01 cusr 0.01 csys = 0.05 CPU) Result: PASS Just supply the -v option to prove itself to get all the verbose output that it suppresses: $ prove -v ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Initialized empty Git repository in /home/avar/g/git/t/trash directory.t0005-signals/.git/ expecting success: test-sigchain >actual case "$?" in 143) true ;; # POSIX w/ SIGTERM=15 3) true ;; # Windows *) false ;; esac && test_cmp expect actual Terminated ok 1 - sigchain works # passed all 1 test(s) 1..1 ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.01 cusr 0.01 csys = 0.04 CPU) Result: PASS As a further example, consider this test script that uses a lot of test-lib.sh features by Jakub Narebski: #!/bin/sh test_description='this is a sample test. This test is here to see various test outputs.' . ./test-lib.sh say 'diagnostic message' test_expect_success 'true test' 'true' test_expect_success 'false test' 'false' test_expect_failure 'true test (todo)' 'true' test_expect_failure 'false test (todo)' 'false' test_debug 'echo "debug message"' test_done The output of that was previously: * diagnostic message # yellow * ok 1: true test * FAIL 2: false test # bold red false * FIXED 3: true test (todo) * still broken 4: false test (todo) # bold green * fixed 1 known breakage(s) # green * still have 1 known breakage(s) # bold red * failed 1 among remaining 3 test(s) # bold red But is now: diagnostic message # yellow ok 1 - true test not ok - 2 false test # bold red # false ok 3 - true test (todo) # TODO known breakage not ok 4 - false test (todo) # TODO known breakage # bold green # fixed 1 known breakage(s) # green # still have 1 known breakage(s) # bold red # failed 1 among remaining 3 test(s) # bold red 1..4 All the coloring is preserved when the test is run manually. Under prove(1) the test performs as expected, even with --debug and --verbose options: $ prove ./example.sh :: --debug --verbose ./example.sh .. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/4 subtests (1 TODO test unexpectedly succeeded) Test Summary Report ------------------- ./example.sh (Wstat: 256 Tests: 4 Failed: 1) Failed test: 2 TODO passed: 3 Non-zero exit status: 1 Files=1, Tests=4, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.00 cusr 0.01 csys = 0.03 CPU) Result: FAIL The TAP harness itself doesn't get confused by the color output, they aren't used by test-lib.sh stdout isn't open to a terminal (test -t 1). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-06-24 21:52:12 +00:00
You can also run each test individually from command line, like this:
test-lib: Adjust output to be valid TAP format TAP, the Test Anything Protocol, is a simple text-based interface between testing modules in a test harness. test-lib.sh's output was already very close to being valid TAP. This change brings it all the way there. Before: $ ./t0005-signals.sh * ok 1: sigchain works * passed all 1 test(s) And after: $ ./t0005-signals.sh ok 1 - sigchain works # passed all 1 test(s) 1..1 The advantage of using TAP is that any program that reads the format (a "test harness") can run the tests. The most popular of these is the prove(1) utility that comes with Perl. It can run tests in parallel, display colored output, format the output to console, file, HTML etc., and much more. An example: $ prove ./t0005-signals.sh ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.01 cusr 0.02 csys = 0.06 CPU) Result: PASS prove(1) gives you human readable output without being too verbose. Running the test suite in parallel with `make test -j15` produces a flood of text. Running them with `prove -j 15 ./t[0-9]*.sh` makes it easy to follow what's going on. All this patch does is re-arrange the output a bit so that it conforms with the TAP spec, everything that the test suite did before continues to work. That includes aggregating results in t/test-results/, the --verbose, --debug and other options for tests, and the test color output. TAP harnesses ignore everything that they don't know about, so running the tests with --verbose works: $ prove ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Terminated ./t0005-signals.sh .. ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.01 sys + 0.01 cusr 0.01 csys = 0.05 CPU) Result: PASS Just supply the -v option to prove itself to get all the verbose output that it suppresses: $ prove -v ./t0005-signals.sh :: --verbose --debug ./t0005-signals.sh .. Initialized empty Git repository in /home/avar/g/git/t/trash directory.t0005-signals/.git/ expecting success: test-sigchain >actual case "$?" in 143) true ;; # POSIX w/ SIGTERM=15 3) true ;; # Windows *) false ;; esac && test_cmp expect actual Terminated ok 1 - sigchain works # passed all 1 test(s) 1..1 ok All tests successful. Files=1, Tests=1, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.01 cusr 0.01 csys = 0.04 CPU) Result: PASS As a further example, consider this test script that uses a lot of test-lib.sh features by Jakub Narebski: #!/bin/sh test_description='this is a sample test. This test is here to see various test outputs.' . ./test-lib.sh say 'diagnostic message' test_expect_success 'true test' 'true' test_expect_success 'false test' 'false' test_expect_failure 'true test (todo)' 'true' test_expect_failure 'false test (todo)' 'false' test_debug 'echo "debug message"' test_done The output of that was previously: * diagnostic message # yellow * ok 1: true test * FAIL 2: false test # bold red false * FIXED 3: true test (todo) * still broken 4: false test (todo) # bold green * fixed 1 known breakage(s) # green * still have 1 known breakage(s) # bold red * failed 1 among remaining 3 test(s) # bold red But is now: diagnostic message # yellow ok 1 - true test not ok - 2 false test # bold red # false ok 3 - true test (todo) # TODO known breakage not ok 4 - false test (todo) # TODO known breakage # bold green # fixed 1 known breakage(s) # green # still have 1 known breakage(s) # bold red # failed 1 among remaining 3 test(s) # bold red 1..4 All the coloring is preserved when the test is run manually. Under prove(1) the test performs as expected, even with --debug and --verbose options: $ prove ./example.sh :: --debug --verbose ./example.sh .. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/4 subtests (1 TODO test unexpectedly succeeded) Test Summary Report ------------------- ./example.sh (Wstat: 256 Tests: 4 Failed: 1) Failed test: 2 TODO passed: 3 Non-zero exit status: 1 Files=1, Tests=4, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.00 cusr 0.01 csys = 0.03 CPU) Result: FAIL The TAP harness itself doesn't get confused by the color output, they aren't used by test-lib.sh stdout isn't open to a terminal (test -t 1). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-06-24 21:52:12 +00:00
$ 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
Add valgrind support in test scripts This patch adds the ability to use valgrind's memcheck tool to diagnose memory problems in Git while running the test scripts. It requires valgrind 3.4.0 or newer. It works by creating symlinks to a valgrind script, which have the same name as our Git binaries, and then putting that directory in front of the test script's PATH as well as set GIT_EXEC_PATH to that directory. Git scripts are symlinked from that directory directly. That way, Git binaries called by Git scripts are valgrinded, too. Valgrind can be used by specifying "GIT_TEST_OPTS=--valgrind" in the make invocation. Any invocation of git that finds any errors under valgrind will exit with failure code 126. Any valgrind output will go to the usual stderr channel for tests (i.e., /dev/null, unless -v has been specified). If you need to pass options to valgrind -- you might want to run another tool than memcheck, for example -- you can set the environment variable GIT_VALGRIND_OPTIONS. A few default suppressions are included, since libz seems to trigger quite a few false positives. We'll assume that libz works and that we can ignore any errors which are reported there. Note: it is safe to run the valgrind tests in parallel, as the links in t/valgrind/bin/ are created using proper locking. Initial patch and all the hard work by Jeff King. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-02-03 23:25:59 +00:00
(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`.
Ignored in test scripts that set the variable 'test_untraceable'
to a non-empty value, unless it's run with a Bash version
supporting BASH_XTRACEFD, i.e. v4.1 or later.
-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. 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.
-V::
test-lib: add --verbose-log option The "--verbose" option redirects output from arbitrary test commands to stdout. This is useful for examining the output manually, like: ./t5547-push-quarantine.sh -v | less But it also means that the output is intermingled with the TAP directives, which can confuse a TAP parser like "prove". This has always been a potential problem, but became an issue recently when one test happened to output the word "ok" on a line by itself, which prove interprets as a test success: $ prove t5547-push-quarantine.sh :: -v t5547-push-quarantine.sh .. 1/? To dest.git * [new branch] HEAD -> master To dest.git ! [remote rejected] reject -> reject (pre-receive hook declined) error: failed to push some refs to 'dest.git' fatal: git cat-file d08c8eba97f4e683ece08654c7c8d2ba0c03b129: bad file t5547-push-quarantine.sh .. Failed -1/4 subtests Test Summary Report ------------------- t5547-push-quarantine.sh (Wstat: 0 Tests: 5 Failed: 0) Parse errors: Tests out of sequence. Found (2) but expected (3) Tests out of sequence. Found (3) but expected (4) Tests out of sequence. Found (4) but expected (5) Bad plan. You planned 4 tests but ran 5. Files=1, Tests=5, 0 wallclock secs ( 0.01 usr + 0.01 sys = 0.02 CPU) Result: FAIL One answer is "if it hurts, don't do it", but that's not quite the whole story. The Travis tests use "--verbose --tee" so that they can get the benefit of prove's parallel options, along with a verbose log in case there is a failure. We just need the verbose output to go to the log, but keep stdout clean. Getting this right turns out to be surprisingly difficult. Here's the progression of alternatives I considered: 1. Add an option to write verbose output to stderr. This is hard to capture, though, because we want each test to have its own log (because they're all run in parallel and the jumbled output would be useless). 2. Add an option to write verbose output to a file in test-results. This works, but the log is missing all of the non-verbose output, which gives context. 3. Like (2), but teach say_color() to additionally output to the log. This mostly works, but misses any output that happens outside of the say() functions (which isn't a lot, but is a potential maintenance headache). 4. Like (2), but make the log file the same as the "--tee" file. That almost works, but now we have two processes opening the same file. That gives us two separate descriptors, each with their own idea of the current position. They'll each start writing at offset 0, and overwrite each other's data. 5. Like (4), but in each case open the file for appending. That atomically positions each write at the end of the file. It's possible we may still get sheared writes between the two processes, but this is already the case when writing to stdout. It's not a problem in practice because the test harness generally waits for snippets to finish before writing the TAP output. We can ignore buffering issues with tee, because POSIX mandates that it does not buffer. Likewise, POSIX specifies "tee -a", so it should be available everywhere. This patch implements option (5), which seems to work well in practice. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-10-21 10:48:00 +00:00
--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.
t/test-lib: introduce --chain-lint option It's easy to miss an "&&"-chain in a test script, like: test_expect_success 'check something important' ' cmd1 && cmd2 cmd3 ' The test harness will notice if cmd3 fails, but a failure of cmd1 or cmd2 will go unnoticed, as their exit status is lost after cmd3 runs. The toy example above is easy to spot because the "cmds" are all the same length, but real code is much more complicated. It's also difficult to detect these situations by statically analyzing the shell code with regexps (like the check-non-portable-shell script does); there's too much context required to know whether a &&-chain is appropriate on a given line or not. This patch instead lets the shell check each test by sticking a command with a specific and unusual return code at the top of each test, like: (exit 117) && cmd1 && cmd2 cmd3 In a well-formed test, the non-zero exit from the first command prevents any of the rest from being run, and the test's exit code is 117. In a bad test (like the one above), the 117 is lost, and cmd3 is run. When we encounter a failure of this check, we abort the test script entirely. For one thing, we have no clue which subset of the commands in the test snippet were actually run. Running further tests would be pointless, because we're now in an unknown state. And two, this is not a "test failure" in the traditional sense. The test script is buggy, not the code it is testing. We should be able to fix these problems in the script once, and not have them come back later as a regression in git's code. After checking a test snippet for --chain-lint, we do still run the test itself. We could actually have a pure-lint mode which just checks each test, but there are a few reasons not to. One, because the tests are executing arbitrary code, which could impact the later environment (e.g., that could impact which set of tests we run at all). And two, because a pure-lint mode would still be expensive to run, because a significant amount of code runs outside of the test_expect_* blocks. Instead, this option is designed to be used as part of a normal test suite run, where it adds very little overhead. Turning on this option detects quite a few problems in existing tests, which will be fixed in subsequent patches. However, there are a number of places it cannot reach: - it cannot find a failure to break out of loops on error, like: cmd1 && for i in a b c; do cmd2 $i done && cmd3 which will not notice failures of "cmd2 a" or "cmd b" - it cannot find a missing &&-chain inside a block or subfunction, like: foo () { cmd1 cmd2 } foo && bar which will not notice a failure of cmd1. - it only checks tests that you run; every platform will have some tests skipped due to missing prequisites, so it's impossible to say from one run that the test suite is free of broken &&-chains. However, all tests get run by _somebody_, so eventually we will notice problems. - it does not operate on test_when_finished or prerequisite blocks. It could, but these tends to be much shorter and less of a problem, so I punted on them in this patch. This patch was inspired by an earlier patch by Jonathan Nieder: http://article.gmane.org/gmane.comp.version-control.git/235913 This implementation and all bugs are mine. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-03-20 10:05:48 +00:00
--chain-lint::
--no-chain-lint::
If --chain-lint is enabled, the test harness will check each
test to make sure that it properly "&&-chains" all commands (so
that a failure in the middle does not go unnoticed by the final
exit code of the test). This check is performed in addition to
running the tests themselves. You may also enable or disable
this feature by setting the GIT_TEST_CHAIN_LINT environment
variable to "1" or "0", respectively.
You can also set the GIT_TEST_INSTALLED environment variable to
the bindir of an existing git installation to test that installation.
You still need to have built this git sandbox, from which various
test-* support programs, templates, and perl libraries are used.
If your installed git is incomplete, it will silently test parts of
your built version instead.
When using GIT_TEST_INSTALLED, you can also set GIT_TEST_EXEC_PATH to
override the location of the dashed-form subcommands (what
GIT_EXEC_PATH would be used for during normal operation).
GIT_TEST_EXEC_PATH defaults to `$GIT_TEST_INSTALLED/git --exec-path`.
Skipping Tests
--------------
In some environments, certain tests have no way of succeeding
due to platform limitation, such as lack of 'unzip' program, or
filesystem that do not allow arbitrary sequence of non-NUL bytes
as pathnames.
You should be able to say something like
$ GIT_SKIP_TESTS=t9200.8 sh ./t9200-git-cvsexport-commit.sh
and even:
$ GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make
to omit such tests. The value of the environment variable is a
SP separated list of patterns that tells which tests to skip,
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.
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 by going through the items
from left to right, so this:
$ sh ./t9200-git-cvsexport-commit.sh --run='1-4 !3'
will run tests 1, 2, and 4. Items that come 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.
Running tests with special setups
---------------------------------
The whole test suite could be run to test some special features
that cannot be easily covered by a few specific test cases. These
could be enabled by running the test suite with correct GIT_TEST_
environment set.
i18n: make GETTEXT_POISON a runtime option Change the GETTEXT_POISON compile-time + runtime GIT_GETTEXT_POISON test parameter to only be a GIT_TEST_GETTEXT_POISON=<non-empty?> runtime parameter, to be consistent with other parameters documented in "Running tests with special setups" in t/README. When I added GETTEXT_POISON in bb946bba76 ("i18n: add GETTEXT_POISON to simulate unfriendly translator", 2011-02-22) I was concerned with ensuring that the _() function would get constant folded if NO_GETTEXT was defined, and likewise that GETTEXT_POISON would be compiled out unless it was defined. But as the benchmark in my [1] shows doing a one-off runtime getenv("GIT_TEST_[...]") is trivial, and since GETTEXT_POISON was originally added the GIT_TEST_* env variables have become the common idiom for turning on special test setups. So change GETTEXT_POISON to work the same way. Now the GETTEXT_POISON=YesPlease compile-time option is gone, and running the tests with GIT_TEST_GETTEXT_POISON=[YesPlease|] can be toggled on/off without recompiling. This allows for conditionally amending tests to test with/without poison, similar to what 859fdc0c3c ("commit-graph: define GIT_TEST_COMMIT_GRAPH", 2018-08-29) did for GIT_TEST_COMMIT_GRAPH. Do some of that, now we e.g. always run the t0205-gettext-poison.sh test. I did enough there to remove the GETTEXT_POISON prerequisite, but its inverse C_LOCALE_OUTPUT is still around, and surely some tests using it can be converted to e.g. always set GIT_TEST_GETTEXT_POISON=. Notes on the implementation: * We still compile a dedicated GETTEXT_POISON build in Travis CI. Perhaps this should be revisited and integrated into the "linux-gcc" build, see ae59a4e44f ("travis: run tests with GIT_TEST_SPLIT_INDEX", 2018-01-07) for prior art in that area. Then again maybe not, see [2]. * We now skip a test in t0000-basic.sh under GIT_TEST_GETTEXT_POISON=YesPlease that wasn't skipped before. This test relies on C locale output, but due to an edge case in how the previous implementation of GETTEXT_POISON worked (reading it from GIT-BUILD-OPTIONS) wasn't enabling poison correctly. Now it does, and needs to be skipped. * The getenv() function is not reentrant, so out of paranoia about code of the form: printf(_("%s"), getenv("some-env")); call use_gettext_poison() in our early setup in git_setup_gettext() so we populate the "poison_requested" variable in a codepath that's won't suffer from that race condition. * We error out in the Makefile if you're still saying GETTEXT_POISON=YesPlease to prompt users to change their invocation. * We should not print out poisoned messages during the test initialization itself to keep it more readable, so the test library hides the variable if set in $GIT_TEST_GETTEXT_POISON_ORIG during setup. See [3]. See also [4] for more on the motivation behind this patch, and the history of the GETTEXT_POISON facility. 1. https://public-inbox.org/git/871s8gd32p.fsf@evledraar.gmail.com/ 2. https://public-inbox.org/git/20181102163725.GY30222@szeder.dev/ 3. https://public-inbox.org/git/20181022202241.18629-2-szeder.dev@gmail.com/ 4. https://public-inbox.org/git/878t2pd6yu.fsf@evledraar.gmail.com/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-11-08 21:15:29 +00:00
GIT_TEST_GETTEXT_POISON=<non-empty?> turns all strings marked for
translation into gibberish if non-empty (think "test -n"). Used for
spotting those tests that need to be marked with a C_LOCALE_OUTPUT
prerequisite when adding more strings for translation. See "Testing
marked strings" in po/README for details.
GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
test suite. Accept any boolean values that are accepted by git-config.
GIT_TEST_FULL_IN_PACK_ARRAY=<boolean> exercises the uncommon
pack-objects code path where there are more than 1024 packs even if
the actual number of packs in repository is below this limit. Accept
any boolean values that are accepted by git-config.
GIT_TEST_OE_SIZE=<n> exercises the uncommon pack-objects code path
where we do not cache object size in memory and read it from existing
packs on demand. This normally only happens when the object size is
over 2GB. This variable forces the code path on any object larger than
<n> bytes.
GIT_TEST_OE_DELTA_SIZE=<n> exercises the uncommon pack-objects code
pack-objects: fix performance issues on packing large deltas Let's start with some background about oe_delta_size() and oe_set_delta_size(). If you already know, skip the next paragraph. These two are added in 0aca34e826 (pack-objects: shrink delta_size field in struct object_entry - 2018-04-14) to help reduce 'struct object_entry' size. The delta size field in this struct is reduced to only contain max 1MB. So if any new delta is produced and larger than 1MB, it's dropped because we can't really save such a large size anywhere. Fallback is provided in case existing packfiles already have large deltas, then we can retrieve it from the pack. While this should help small machines repacking large repos without large deltas (i.e. less memory pressure), dropping large deltas during the delta selection process could end up with worse pack files. And if existing packfiles already have >1MB delta and pack-objects is instructed to not reuse deltas, all of them will be dropped on the floor, and the resulting pack would be definitely bigger. There is also a regression in terms of CPU/IO if we have large on-disk deltas because fallback code needs to parse the pack every time the delta size is needed and just access to the mmap'd pack data is enough for extra page faults when memory is under pressure. Both of these issues were reported on the mailing list. Here's some numbers for comparison. Version Pack (MB) MaxRSS(kB) Time (s) ------- --------- ---------- -------- 2.17.0 5498 43513628 2494.85 2.18.0 10531 40449596 4168.94 This patch provides a better fallback that is - cheaper in terms of cpu and io because we won't have to read existing pack files as much - better in terms of pack size because the pack heuristics is back to 2.17.0 time, we do not drop large deltas at all If we encounter any delta (on-disk or created during try_delta phase) that is larger than the 1MB limit, we stop using delta_size_ field for this because it can't contain such size anyway. A new array of delta size is dynamically allocated and can hold all the deltas that 2.17.0 can. This array only contains delta sizes that delta_size_ can't contain. With this, we do not have to drop deltas in try_delta() anymore. Of course the downside is we use slightly more memory, even compared to 2.17.0. But since this is considered an uncommon case, a bit more memory consumption should not be a problem. Delta size limit is also raised from 1MB to 16MB to better cover common case and avoid that extra memory consumption (99.999% deltas in this reported repo are under 12MB; Jeff noted binary artifacts topped out at about 3MB in some other private repos). Other fields are shuffled around to keep this struct packed tight. We don't use more memory in common case even with this limit update. A note about thread synchronization. Since this code can be run in parallel during delta searching phase, we need a mutex. The realloc part in packlist_alloc() is not protected because it only happens during the object counting phase, which is always single-threaded. Access to e->delta_size_ (and by extension pack->delta_size[e - pack->objects]) is unprotected as before, the thread scheduler in pack-objects must make sure "e" is never updated by two different threads. The area under the new lock is as small as possible, avoiding locking at all in common case, since lock contention with high thread count could be expensive (most blobs are small enough that delta compute time is short and we end up taking the lock very often). The previous attempt to always hold a lock in oe_delta_size() and oe_set_delta_size() increases execution time by 33% when repacking linux.git with with 40 threads. Reported-by: Elijah Newren <newren@gmail.com> Helped-by: Elijah Newren <newren@gmail.com> Helped-by: Jeff King <peff@peff.net> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-07-22 08:04:21 +00:00
path where deltas larger than this limit require extra memory
allocation for bookkeeping.
GIT_TEST_VALIDATE_INDEX_CACHE_ENTRIES=<boolean> checks that cache-tree
records are valid when the index is written out or after a merge. This
is mostly to catch missing invalidation. Default is true.
GIT_TEST_COMMIT_GRAPH=<boolean>, when true, forces the commit-graph to
be written after every 'git commit' command, and overrides the
'core.commitGraph' setting to true.
GIT_TEST_FSMONITOR=$PWD/t7519/fsmonitor-all exercises the fsmonitor
code path for utilizing a file system monitor to speed up detecting
new or changed files.
GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
for the index version specified. Can be set to any valid version
(currently 2, 3, or 4).
GIT_TEST_PRELOAD_INDEX=<boolean> exercises the preload-index code path
by overriding the minimum number of cache entries required per thread.
GIT_TEST_REBASE_USE_BUILTIN=<boolean>, when false, disables the
builtin version of git-rebase. See 'rebase.useBuiltin' in
git-config(1).
GIT_TEST_INDEX_THREADS=<n> enables exercising the multi-threaded loading
of the index for the whole test suite by bypassing the default number of
cache entries and thread minimums. Setting this to 1 will make the
index loading single threaded.
GIT_TEST_MULTI_PACK_INDEX=<boolean>, when true, forces the multi-pack-
index to be written after every 'git repack' command, and overrides the
'core.multiPackIndex' setting to true.
Naming Tests
------------
The test files are named as:
tNNNN-commandname-details.sh
where N is a decimal digit.
First digit tells the family:
0 - the absolute basics and global stuff
1 - the basic commands concerning database
2 - the basic commands concerning the working tree
3 - the other basic commands (e.g. ls-files)
4 - the diff commands
5 - the pull and exporting commands
6 - the revision tree commands (even e.g. merge-base)
7 - the porcelainish commands concerning the working tree
8 - the porcelainish commands concerning forensics
9 - the git tools
Second digit tells the particular command we are testing.
Third digit (optionally) tells the particular switch or group of switches
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. 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.
Writing Tests
-------------
The test script is written as a shell script. It should start
with the standard "#!/bin/sh", and an
assignment to variable 'test_description', like this:
#!/bin/sh
test_description='xxx test (option --frotz)
This test registers the following structure in the cache
and tries to run git-ls-files with option --frotz.'
Source 'test-lib.sh'
--------------------
After assigning test_description, the test script should source
test-lib.sh like this:
. ./test-lib.sh
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.$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
-------------
Here are a few examples of things you probably should and shouldn't do
when writing tests.
Here are the "do's:"
- 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 $TRASH_DIRECTORY. It makes a difference on
Windows, where the shell (MSYS bash) mangles absolute path names.
For details, see the commit message of 4114156ae9.
- Remember that inside the <script> part, the standard output and
standard error streams are discarded, and the test harness only
reports "ok" or "not ok" to the end user running the tests. Under
--verbose, they are shown to help debug the tests.
And here are the "don'ts:"
- Don't exit() within a <script> part.
The harness will catch this as a programming error of the test.
Use test_done instead if you need to stop the tests early (see
"Skipping tests" below).
- Don't use '! git cmd' when you want to make sure the git command
exits with failure in a controlled way by calling "die()". Instead,
use 'test_must_fail git cmd'. This will signal a failure if git
dies in an unexpected way (e.g. segfault).
On the other hand, don't use test_must_fail for running regular
platform commands; just use '! cmd'. We are not in the business
of verifying that the world given to us sanely works.
- Don't feed the output of a git command to a pipe, as in:
git -C repo ls-files |
xargs -n 1 basename |
grep foo
which will discard git's exit code and may mask a crash. In the
above example, all exit codes are ignored except grep's.
Instead, write the output of that command to a temporary
file with ">" or assign it to a variable with "x=$(git ...)" rather
than pipe it.
- Don't use command substitution in a way that discards git's exit
code. When assigning to a variable, the exit code is not discarded,
e.g.:
x=$(git cat-file -p $sha) &&
...
is OK because a crash in "git cat-file" will cause the "&&" chain
to fail, but:
test "refs/heads/foo" = "$(git symbolic-ref HEAD)"
is not OK and a crash in git could go undetected.
- Don't 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 $PERL_PATH under the hood, so
you do not need to worry when simply running perl in the test scripts
(but you do, for example, on a shebang line or in a sub script
created via "write_script").
- Don't use sh without spelling it as "$SHELL_PATH", when the script
can be misinterpreted by broken platform shell (e.g. Solaris).
- Don't 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.
- Don't save and verify the standard error of compound commands, i.e.
group commands, subshells, and shell functions (except test helper
functions like 'test_must_fail') like this:
( cd dir && git cmd ) 2>error &&
test_cmp expect error
When running the test with '-x' tracing, then the trace of commands
executed in the compound command will be included in standard error
as well, quite possibly throwing off the subsequent checks examining
the output. Instead, save only the relevant git command's standard
error:
( cd dir && git cmd 2>../error ) &&
test_cmp expect error
- Don't 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 $y are integers.
- Don't print lines that begin with "ok" or "not ok".
TAP harnesses expect a line that begins with either "ok" and "not
ok" to signal a test passed or failed (and our harness already
produces such lines), so your script shouldn't emit such lines to
their output.
You can glean some further possible issues from the TAP grammar
(see https://metacpan.org/pod/TAP::Parser::Grammar#TAP-GRAMMAR)
but the best indication is to just run the tests with prove(1),
it'll complain if anything is amiss.
Skipping tests
--------------
If you need to skip tests you should do so by using the three-arg form
of the test_* functions (see the "Test harness library" section
below), e.g.:
test_expect_success PERL 'I need Perl' '
perl -e "hlagh() if unf_unf()"
'
The advantage of skipping tests like this is that platforms that don't
have the PERL and other optional dependencies get an indication of how
many tests they're missing.
If the test code is too hairy for that (i.e. does a lot of setup work
outside test assertions) you can also skip all remaining tests by
setting skip_all and immediately call test_done:
if ! test_have_prereq PERL
then
skip_all='skipping perl interface tests, perl not available'
test_done
fi
The string you give to skip_all will be used as an explanation for why
the test was skipped.
End with test_done
------------------
Your script will be a sequence of tests, using helper functions
from the test harness library. At the end of the script, call
'test_done'.
Test harness library
--------------------
There are a handful helper functions defined in the test harness
library for your script to use.
- test_expect_success [<prereq>] <message> <script>
Usually takes two strings as parameters, and evaluates the
<script>. If it yields success, test is considered
successful. <message> should state what it is testing.
Example:
test_expect_success \
'git-write-tree should be able to write an empty tree.' \
'tree=$(git-write-tree)'
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 $(perl -E 'print eval "1 +" . qx[python -c "print 2"]') == "4" '
- test_expect_failure [<prereq>] <message> <script>
Sane use of test_expect_failure Originally, test_expect_failure was designed to be the opposite of test_expect_success, but this was a bad decision. Most tests run a series of commands that leads to the single command that needs to be tested, like this: test_expect_{success,failure} 'test title' ' setup1 && setup2 && setup3 && what is to be tested ' And expecting a failure exit from the whole sequence misses the point of writing tests. Your setup$N that are supposed to succeed may have failed without even reaching what you are trying to test. The only valid use of test_expect_failure is to check a trivial single command that is expected to fail, which is a minority in tests of Porcelain-ish commands. This large-ish patch rewrites all uses of test_expect_failure to use test_expect_success and rewrites the condition of what is tested, like this: test_expect_success 'test title' ' setup1 && setup2 && setup3 && ! this command should fail ' test_expect_failure is redefined to serve as a reminder that that test *should* succeed but due to a known breakage in git it currently does not pass. So if git-foo command should create a file 'bar' but you discovered a bug that it doesn't, you can write a test like this: test_expect_failure 'git-foo should create bar' ' rm -f bar && git foo && test -f bar ' This construct acts similar to test_expect_success, but instead of reporting "ok/FAIL" like test_expect_success does, the outcome is reported as "FIXED/still broken". Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-01 09:50:53 +00:00
This is NOT the opposite of test_expect_success, but is used
to mark a test that demonstrates a known breakage. Unlike
the usual test_expect_success tests, which say "ok" on
success and "FAIL" on failure, this will say "FIXED" on
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
when the test script is started with --debug command line
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
is to summarize successes and failures in the test script and
exit with an appropriate error code.
- test_tick
Make commit and tag names consistent by setting the author and
committer times to defined state. Subsequent calls will
advance the times by a fixed amount.
- test_commit <message> [<filename> [<contents>]]
Creates a commit with the given message, committing the given
file with the given contents (default for both is to reuse the
message string), and adds a tag (again reusing the message
string as name). Calls test_tick to make the SHA-1s
reproducible.
- test_merge <message> <commit-or-tag>
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 [<options>] <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.
Accepts the following options:
ok=<signal-name>[,<...>]:
Don't treat an exit caused by the given signal as error.
Multiple signals can be specified as a comma separated list.
Currently recognized signal names are: sigpipe, success.
(Don't use 'success', use 'test_might_fail' instead.)
- test_might_fail [<options>] <git-command>
Similar to test_must_fail, but tolerate success, too. Use this
instead of "<git-command> || :" to catch failures due to segv.
Accepts the same options as test_must_fail.
- 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_cmp_rev <expected> <actual>
Check whether the <expected> rev points to the same commit as the
<actual> rev.
- 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).
t: add test functions to translate hash-related values Add several test functions to make working with various hash-related values easier. Add test_oid_init, which loads common hash-related constants and placeholder object IDs from the newly added files in t/oid-info. Provide values for these constants for both SHA-1 and SHA-256. Add test_oid_cache, which accepts data on standard input in the form of hash-specific key-value pairs that can be looked up later, using the same format as the files in t/oid-info. Document this format in a t/oid-info/README directory so that it's easier to use in the future. Add test_oid, which is used to specify look up a per-hash value (produced on standard output) based on the key specified as its argument. Usually the data to be looked up will be a hash-related constant (such as the size of the hash in binary or hexadecimal), a well-known or placeholder object ID (such as the all-zeros object ID or one consisting of "deadbeef" repeated), or something similar. For these reasons, test_oid will usually be used within a command substitution. Consequently, redirect the error output to standard error, since otherwise it will not be displayed. Add test_detect_hash, which currently only detects SHA-1, and test_set_hash, which can be used to set a different hash algorithm for test purposes. In the future, test_detect_hash will learn to actually detect the hash depending on how the testsuite is to be run. Use the local keyword within these functions to avoid overwriting other shell variables. We have had a test balloon in place for a couple of releases to catch shells that don't have this keyword and have not received any reports of failure. Note that the varying usages of local used here are supported by all common open-source shells supporting the local keyword. Test these new functions as part of t0000, which also serves to demonstrate basic usage of them. In addition, add documentation on how to format the lookup data and how to use the test functions. Implement two basic lookup charts, one for common invalid or synthesized object IDs, and one for various facts about the hash function in use. Provide versions of the data for both SHA-1 and SHA-256. Since we use shell variables for storage, names used for lookup can currently consist only of shell identifier characters. If this is a problem in the future, we can hash the names before use. Improved-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-13 05:17:31 +00:00
- test_oid_init
This function loads facts and useful object IDs related to the hash
algorithm(s) in use from the files in t/oid-info.
- test_oid_cache
This function reads per-hash algorithm information from standard
input (usually a heredoc) in the format described in
t/oid-info/README. This is useful for test-specific values, such as
object IDs, which must vary based on the hash algorithm.
Certain fixed values, such as hash sizes and common placeholder
object IDs, can be loaded with test_oid_init (described above).
- test_oid <key>
This function looks up a value for the hash algorithm in use, based
on the key given. The value must have been loaded using
test_oid_init or test_oid_cache. Providing an unknown key is an
error.
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.
- PCRE
Git was compiled with support for PCRE. Wrap any tests
that use git-grep --perl-regexp or git-grep -P in these.
- LIBPCRE1
Git was compiled with PCRE v1 support via
USE_LIBPCRE1=YesPlease. Wrap any PCRE using tests that for some
reason need v1 of the PCRE library instead of v2 in these.
- LIBPCRE2
Git was compiled with PCRE v2 support via
USE_LIBPCRE2=YesPlease. Wrap any PCRE using tests that for some
reason need v2 of the PCRE library instead of v1 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).
- PTHREADS
Git wasn't compiled with NO_PTHREADS=YesPlease.
Tips for Writing Tests
----------------------
As with any programming projects, existing programs are the best
source of the information. However, do _not_ emulate
t0000-basic.sh when writing your tests. The test is special in
that it tries to validate the very core of GIT. For example, it
knows that there will be 256 subdirectories under .git/objects/,
and it knows that the object ID of an empty tree is a certain
40-byte string. This is deliberately done so in t0000-basic.sh
because the things the very basic core test tries to achieve is
to serve as a basis for people who are changing the GIT internal
drastically. For these people, after making certain changes,
not seeing failures from the basic test _is_ a failure. And
such drastic changes to the core GIT that even changes these
otherwise supposedly stable object IDs should be accompanied by
an update to t0000-basic.sh.
However, other tests that simply rely on basic parts of the core
GIT working properly should not have that level of intimate
knowledge of the core GIT internals. If all the test scripts
hardcoded the object IDs like t0000-basic.sh does, that defeats
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.