t/README: Typo: paralell -> parallel
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1Core GIT Tests
2==============
3
4This directory holds many test scripts for core GIT tools. The
5first part of this short document describes how to run the tests
6and read their output.
7
8When fixing the tools or adding enhancements, you are strongly
9encouraged to add tests in this directory to cover what you are
10trying to fix or enhance. The later part of this short document
11describes how your test scripts should be organized.
12
13
14Running Tests
15-------------
16
17The easiest way to run tests is to say "make". This runs all
18the tests.
19
20 *** t0000-basic.sh ***
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21 ok 1 - .git/objects should be empty after git init in an empty repo.
22 ok 2 - .git/objects should have 3 subdirectories.
23 ok 3 - success is reported like this
986aa7f1 24 ...
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25 ok 43 - very long name in the index handled sanely
26 # fixed 1 known breakage(s)
27 # still have 1 known breakage(s)
28 # passed all remaining 42 test(s)
29 1..43
30 *** t0001-init.sh ***
31 ok 1 - plain
32 ok 2 - plain with GIT_WORK_TREE
33 ok 3 - plain bare
34
35Since the tests all output TAP (see http://testanything.org) they can
85b0b34e 36be run with any TAP harness. Here's an example of parallel testing
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37powered by a recent version of prove(1):
38
39 $ prove --timer --jobs 15 ./t[0-9]*.sh
40 [19:17:33] ./t0005-signals.sh ................................... ok 36 ms
41 [19:17:33] ./t0022-crlf-rename.sh ............................... ok 69 ms
42 [19:17:33] ./t0024-crlf-archive.sh .............................. ok 154 ms
43 [19:17:33] ./t0004-unwritable.sh ................................ ok 289 ms
44 [19:17:33] ./t0002-gitfile.sh ................................... ok 480 ms
45 ===( 102;0 25/? 6/? 5/? 16/? 1/? 4/? 2/? 1/? 3/? 1... )===
46
47prove and other harnesses come with a lot of useful options. The
48--state option in particular is very useful:
49
50 # Repeat until no more failures
51 $ prove -j 15 --state=failed,save ./t[0-9]*.sh
986aa7f1 52
5099b99d 53You can also run each test individually from command line, like this:
986aa7f1 54
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55 $ sh ./t3010-ls-files-killed-modified.sh
56 ok 1 - git update-index --add to add various paths.
57 ok 2 - git ls-files -k to show killed files.
58 ok 3 - validate git ls-files -k output.
59 ok 4 - git ls-files -m to show modified files.
60 ok 5 - validate git ls-files -m output.
61 # passed all 5 test(s)
62 1..5
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63
64You can pass --verbose (or -v), --debug (or -d), and --immediate
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65(or -i) command line argument to the test, or by setting GIT_TEST_OPTS
66appropriately before running "make".
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67
68--verbose::
69 This makes the test more verbose. Specifically, the
70 command being run and their output if any are also
71 output.
72
73--debug::
74 This may help the person who is developing a new test.
75 It causes the command defined with test_debug to run.
76
77--immediate::
78 This causes the test to immediately exit upon the first
79 failed test.
80
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81--long-tests::
82 This causes additional long-running tests to be run (where
83 available), for more exhaustive testing.
84
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85--valgrind::
86 Execute all Git binaries with valgrind and exit with status
87 126 on errors (just like regular tests, this will only stop
88 the test script when running under -i). Valgrind errors
89 go to stderr, so you might want to pass the -v option, too.
986aa7f1 90
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91 Since it makes no sense to run the tests with --valgrind and
92 not see any output, this option implies --verbose. For
93 convenience, it also implies --tee.
94
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95--tee::
96 In addition to printing the test output to the terminal,
97 write it to files named 't/test-results/$TEST_NAME.out'.
98 As the names depend on the tests' file names, it is safe to
99 run the tests with this option in parallel.
100
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101--with-dashes::
102 By default tests are run without dashed forms of
103 commands (like git-commit) in the PATH (it only uses
104 wrappers from ../bin-wrappers). Use this option to include
105 the build directory (..) in the PATH, which contains all
106 the dashed forms of commands. This option is currently
107 implied by other options like --valgrind and
108 GIT_TEST_INSTALLED.
109
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110--root=<directory>::
111 Create "trash" directories used to store all temporary data during
112 testing under <directory>, instead of the t/ directory.
113 Using this option with a RAM-based filesystem (such as tmpfs)
114 can massively speed up the test suite.
115
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116You can also set the GIT_TEST_INSTALLED environment variable to
117the bindir of an existing git installation to test that installation.
118You still need to have built this git sandbox, from which various
119test-* support programs, templates, and perl libraries are used.
120If your installed git is incomplete, it will silently test parts of
121your built version instead.
122
123When using GIT_TEST_INSTALLED, you can also set GIT_TEST_EXEC_PATH to
124override the location of the dashed-form subcommands (what
125GIT_EXEC_PATH would be used for during normal operation).
126GIT_TEST_EXEC_PATH defaults to `$GIT_TEST_INSTALLED/git --exec-path`.
127
128
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129Skipping Tests
130--------------
131
132In some environments, certain tests have no way of succeeding
133due to platform limitation, such as lack of 'unzip' program, or
134filesystem that do not allow arbitrary sequence of non-NUL bytes
135as pathnames.
136
137You should be able to say something like
138
139 $ GIT_SKIP_TESTS=t9200.8 sh ./t9200-git-cvsexport-commit.sh
140
141and even:
142
143 $ GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make
144
145to omit such tests. The value of the environment variable is a
146SP separated list of patterns that tells which tests to skip,
147and either can match the "t[0-9]{4}" part to skip the whole
148test, or t[0-9]{4} followed by ".$number" to say which
149particular test to skip.
150
151Note that some tests in the existing test suite rely on previous
152test item, so you cannot arbitrarily disable one and expect the
153remainder of test to check what the test originally was intended
154to check.
155
156
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157Naming Tests
158------------
159
160The test files are named as:
161
162 tNNNN-commandname-details.sh
163
164where N is a decimal digit.
165
166First digit tells the family:
167
168 0 - the absolute basics and global stuff
169 1 - the basic commands concerning database
170 2 - the basic commands concerning the working tree
171 3 - the other basic commands (e.g. ls-files)
172 4 - the diff commands
173 5 - the pull and exporting commands
174 6 - the revision tree commands (even e.g. merge-base)
8f4a9b62 175 7 - the porcelainish commands concerning the working tree
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176 8 - the porcelainish commands concerning forensics
177 9 - the git tools
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178
179Second digit tells the particular command we are testing.
180
181Third digit (optionally) tells the particular switch or group of switches
182we are testing.
183
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184If you create files under t/ directory (i.e. here) that is not
185the top-level test script, never name the file to match the above
186pattern. The Makefile here considers all such files as the
187top-level test script and tries to run all of them. A care is
188especially needed if you are creating a common test library
189file, similar to test-lib.sh, because such a library file may
190not be suitable for standalone execution.
191
f50c9f76 192
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193Writing Tests
194-------------
195
196The test script is written as a shell script. It should start
197with the standard "#!/bin/sh" with copyright notices, and an
198assignment to variable 'test_description', like this:
199
200 #!/bin/sh
201 #
202 # Copyright (c) 2005 Junio C Hamano
203 #
204
14cd1ff3 205 test_description='xxx test (option --frotz)
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206
207 This test registers the following structure in the cache
208 and tries to run git-ls-files with option --frotz.'
209
f50c9f76 210
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211Source 'test-lib.sh'
212--------------------
213
214After assigning test_description, the test script should source
215test-lib.sh like this:
216
217 . ./test-lib.sh
218
219This test harness library does the following things:
220
221 - If the script is invoked with command line argument --help
222 (or -h), it shows the test_description and exits.
223
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224 - Creates an empty test directory with an empty .git/objects database
225 and chdir(2) into it. This directory is 't/trash
226 directory.$test_name_without_dotsh', with t/ subject to change by
227 the --root option documented above.
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228
229 - Defines standard test helper functions for your scripts to
230 use. These functions are designed to make all scripts behave
231 consistently when command line arguments --verbose (or -v),
232 --debug (or -d), and --immediate (or -i) is given.
233
14cd1ff3 234
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235End with test_done
236------------------
237
238Your script will be a sequence of tests, using helper functions
239from the test harness library. At the end of the script, call
240'test_done'.
241
242
243Test harness library
244--------------------
245
246There are a handful helper functions defined in the test harness
247library for your script to use.
248
249 - test_expect_success <message> <script>
250
251 This takes two strings as parameter, and evaluates the
252 <script>. If it yields success, test is considered
253 successful. <message> should state what it is testing.
254
255 Example:
256
257 test_expect_success \
258 'git-write-tree should be able to write an empty tree.' \
259 'tree=$(git-write-tree)'
260
261 - test_expect_failure <message> <script>
262
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263 This is NOT the opposite of test_expect_success, but is used
264 to mark a test that demonstrates a known breakage. Unlike
265 the usual test_expect_success tests, which say "ok" on
266 success and "FAIL" on failure, this will say "FIXED" on
267 success and "still broken" on failure. Failures from these
268 tests won't cause -i (immediate) to stop.
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269
270 - test_debug <script>
271
272 This takes a single argument, <script>, and evaluates it only
273 when the test script is started with --debug command line
274 argument. This is primarily meant for use during the
275 development of a new test script.
276
277 - test_done
278
279 Your test script must have test_done at the end. Its purpose
280 is to summarize successes and failures in the test script and
281 exit with an appropriate error code.
282
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283 - test_tick
284
285 Make commit and tag names consistent by setting the author and
286 committer times to defined stated. Subsequent calls will
287 advance the times by a fixed amount.
288
289 - test_commit <message> [<filename> [<contents>]]
290
291 Creates a commit with the given message, committing the given
292 file with the given contents (default for both is to reuse the
293 message string), and adds a tag (again reusing the message
294 string as name). Calls test_tick to make the SHA-1s
295 reproducible.
296
297 - test_merge <message> <commit-or-tag>
298
299 Merges the given rev using the given message. Like test_commit,
300 creates a tag and calls test_tick before committing.
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301
302Tips for Writing Tests
303----------------------
304
305As with any programming projects, existing programs are the best
306source of the information. However, do _not_ emulate
307t0000-basic.sh when writing your tests. The test is special in
308that it tries to validate the very core of GIT. For example, it
309knows that there will be 256 subdirectories under .git/objects/,
310and it knows that the object ID of an empty tree is a certain
31140-byte string. This is deliberately done so in t0000-basic.sh
312because the things the very basic core test tries to achieve is
313to serve as a basis for people who are changing the GIT internal
314drastically. For these people, after making certain changes,
315not seeing failures from the basic test _is_ a failure. And
316such drastic changes to the core GIT that even changes these
317otherwise supposedly stable object IDs should be accompanied by
318an update to t0000-basic.sh.
319
320However, other tests that simply rely on basic parts of the core
321GIT working properly should not have that level of intimate
322knowledge of the core GIT internals. If all the test scripts
323hardcoded the object IDs like t0000-basic.sh does, that defeats
324the purpose of t0000-basic.sh, which is to isolate that level of
325validation in one place. Your test also ends up needing
326updating when such a change to the internal happens, so do _not_
327do it and leave the low level of validation to t0000-basic.sh.