git
Git version interoperability tests
This directory has interoperability tests for git. Each script is similar to the normal test scripts found in t/, but with the added twist that two special versions of git, "git.a" and "git.b", are available in the PATH. Individual tests can then check the interaction between the two versions.
When you add a feature that handles backwards compatibility between git versions, it's encouraged to add a test here to make sure it behaves as you expect.
Running Tests
The easiest way to run tests is to say "make". This runs all the tests against their default versions.
You can run a single test like:
$ ./i0000-basic.sh
ok 1 - bare git is forbidden
ok 2 - git.a version (v1.6.6.3)
ok 3 - git.b version (v2.11.1)
# passed all 3 test(s)
1..3
Each test contains default versions to run against. You may override
these by setting GIT_TEST_VERSION_A
and GIT_TEST_VERSION_B
in the
environment. Note that not all combinations will give sensible outcomes
for all tests (e.g., a test checking for a specific old/new interaction
may want something "old" enough" and something "new" enough; see
individual tests for details).
Version names should be resolvable as revisions in the current repository. They will be exported and built as needed using the config.mak files found at the root of your working tree.
The exception is the special version "." which uses the currently-built contents of your working tree.
You can set the following variables (in the environment or in your config.mak):
GIT_INTEROP_MAKE_OPTS
Options to pass to `make` when building a git version (e.g.,
`-j8`).
You can also pass any command-line options taken by ordinary git tests (e.g., "-v").
Naming Tests
The interop test files are named like:
iNNNN-short-description.sh
where N is a decimal digit. The same conventions for choosing NNNN as for normal tests apply.
Writing Tests
An interop test script starts like a normal script, declaring a few variables and then including interop-lib.sh (which includes test-lib.sh). Besides test_description, you should also set the $VERSION_A and $VERSION_B variables to give the default versions to test against. See t0000-basic.sh for an example.
You can then use test_expect_success as usual, with a few differences:
-
The special commands "git.a" and "git.b" correspond to the two versions.
-
You cannot call a bare "git". This is to prevent accidents where you meant "git.a" or "git.b".
-
The trash directory is not a git repository by default. You should create one with the appropriate version of git.
At the end of the script, call test_done as usual.