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t/README: document more test helpers

There is no documentation in t/README for test_must_fail,
test_might_fail, test_cmp, or test_when_finished.

Reported-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent 6fd4529 commit c9667456d201c435af523ffb7d583efd1784232a @jrn jrn committed with gitster Jul 6, 2010
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31 t/README
@@ -448,6 +448,37 @@ library for your script to use.
'Perl API' \
"$PERL_PATH" "$TEST_DIRECTORY"/t9700/test.pl
+ - test_must_fail <git-command>
+
+ Run a git command and ensure it fails in a controlled way. Use
+ this instead of "! <git-command>" to fail when git commands
+ segfault.
+
+ - 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_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" &&
+ ...
+ '
+
Tips for Writing Tests
----------------------

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