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Johannes Schindelin 4fcc86b07d Introduce the function strip_path_suffix() 16 years ago
..
lib-httpd http-push: when making directories, have a trailing slash in the path name 16 years ago
t3900
t4013 Merge branch 'maint' 16 years ago
t4020
t4100
t4101
t4109
t4110
t4252 git-am: implement --reject option passed to git-apply 16 years ago
t5100 mailinfo: cleanup extra spaces for complex 'From:' 16 years ago
t5515
t7004
t7500
t8005
t9110
t9111
t9115
t9121
t9126
t9135 test case for regression caused by git-svn empty symlink fix 16 years ago
t9700
.gitattributes
.gitignore
Makefile
README test-lib.sh: introduce test_commit() and test_merge() helpers 16 years ago
aggregate-results.sh
annotate-tests.sh
diff-lib.sh
lib-git-svn.sh
lib-httpd.sh use uppercase POSIX compliant signals for the 'trap' command 16 years ago
lib-read-tree-m-3way.sh
lib-rebase.sh lib-rebase.sh: Document what set_fake_editor() does 16 years ago
t0000-basic.sh
t0001-init.sh
t0002-gitfile.sh
t0003-attributes.sh
t0004-unwritable.sh
t0005-signals.sh t0005: use SIGTERM for sigchain test 16 years ago
t0010-racy-git.sh
t0020-crlf.sh
t0021-conversion.sh
t0022-crlf-rename.sh
t0023-crlf-am.sh
t0024-crlf-archive.sh
t0030-stripspace.sh
t0040-parse-options.sh
t0050-filesystem.sh
t0055-beyond-symlinks.sh
t0060-path-utils.sh Introduce the function strip_path_suffix() 16 years ago
t0070-fundamental.sh Add ctype test 16 years ago
t0100-previous.sh Teach @{-1} to git merge 16 years ago
t1000-read-tree-m-3way.sh
t1001-read-tree-m-2way.sh unpack-trees: fix path search bug in verify_absent 16 years ago
t1002-read-tree-m-u-2way.sh
t1003-read-tree-prefix.sh
t1004-read-tree-m-u-wf.sh
t1005-read-tree-reset.sh
t1006-cat-file.sh
t1007-hash-object.sh
t1020-subdirectory.sh
t1100-commit-tree-options.sh
t1200-tutorial.sh
t1300-repo-config.sh
t1301-shared-repo.sh
t1302-repo-version.sh
t1303-wacky-config.sh
t1400-update-ref.sh update-ref --no-deref -d: handle the case when the pointed ref is packed 16 years ago
t1401-symbolic-ref.sh symbolic-ref: allow refs/<whatever> in HEAD 16 years ago
t1410-reflog.sh
t1420-lost-found.sh
t1450-fsck.sh fsck: check loose objects from alternate object stores by default 16 years ago
t1500-rev-parse.sh t1500: more 'git rev-parse --git-dir' tests 16 years ago
t1501-worktree.sh Move 'rev-parse --git-dir' test to t1500 16 years ago
t1502-rev-parse-parseopt.sh
t1503-rev-parse-verify.sh
t1504-ceiling-dirs.sh Fix GIT_CEILING_DIRECTORIES on Windows 16 years ago
t1505-rev-parse-last.sh t1505: remove debugging cruft 16 years ago
t2000-checkout-cache-clash.sh
t2001-checkout-cache-clash.sh
t2002-checkout-cache-u.sh
t2003-checkout-cache-mkdir.sh
t2004-checkout-cache-temp.sh
t2005-checkout-index-symlinks.sh Avoid using non-portable `echo -n` in tests. 16 years ago
t2007-checkout-symlink.sh
t2008-checkout-subdir.sh
t2009-checkout-statinfo.sh
t2010-checkout-ambiguous.sh
t2011-checkout-invalid-head.sh git checkout: do not allow switching to a tree-ish that is not a commit 16 years ago
t2012-checkout-last.sh interpret_nth_last_branch(): avoid traversing the reflog twice 16 years ago
t2050-git-dir-relative.sh
t2100-update-cache-badpath.sh
t2101-update-index-reupdate.sh
t2102-update-index-symlinks.sh Avoid using non-portable `echo -n` in tests. 16 years ago
t2103-update-index-ignore-missing.sh
t2200-add-update.sh add -u: do not fail to resolve a path as deleted 16 years ago
t2201-add-update-typechange.sh
t2202-add-addremove.sh
t2203-add-intent.sh git add --intent-to-add: do not let an empty blob be committed by accident 16 years ago
t2300-cd-to-toplevel.sh git-sh-setup: Use "cd" option, not /bin/pwd, for symlinked work tree 16 years ago
t3000-ls-files-others.sh
t3001-ls-files-others-exclude.sh test overlapping ignore patterns 16 years ago
t3002-ls-files-dashpath.sh
t3010-ls-files-killed-modified.sh
t3020-ls-files-error-unmatch.sh
t3030-merge-recursive.sh
t3040-subprojects-basic.sh
t3050-subprojects-fetch.sh
t3060-ls-files-with-tree.sh
t3100-ls-tree-restrict.sh
t3101-ls-tree-dirname.sh
t3200-branch.sh git-branch: display sha1 on branch deletion 16 years ago
t3201-branch-contains.sh
t3202-show-branch-octopus.sh
t3210-pack-refs.sh do not force write of packed refs 16 years ago
t3300-funny-names.sh
t3400-rebase.sh Add two extra tests for git rebase 16 years ago
t3401-rebase-partial.sh
t3402-rebase-merge.sh
t3403-rebase-skip.sh
t3404-rebase-interactive.sh Merge branch 'js/maint-rebase-i-submodule' 16 years ago
t3405-rebase-malformed.sh
t3406-rebase-message.sh
t3407-rebase-abort.sh
t3408-rebase-multi-line.sh
t3409-rebase-hook.sh tests: Avoid single-shot environment export for shell function invocation 16 years ago
t3409-rebase-preserve-merges.sh rebase -i -p: leave a --cc patch when a merge could not be redone 16 years ago
t3410-rebase-preserve-dropped-merges.sh Simplify t3410 16 years ago
t3411-rebase-preserve-around-merges.sh Simplify t3411 16 years ago
t3412-rebase-root.sh t3412: further simplify setting of GIT_EDITOR 16 years ago
t3500-cherry.sh
t3501-revert-cherry-pick.sh t3501: check that commits are actually done 16 years ago
t3502-cherry-pick-merge.sh
t3503-cherry-pick-root.sh
t3504-cherry-pick-rerere.sh
t3600-rm.sh Make sure lockfiles are unlocked when dying on SIGPIPE 16 years ago
t3700-add.sh
t3701-add-interactive.sh
t3800-mktag.sh
t3900-i18n-commit.sh
t3901-8859-1.txt
t3901-i18n-patch.sh
t3901-utf8.txt
t3902-quoted.sh
t3903-stash.sh
t4000-diff-format.sh
t4001-diff-rename.sh
t4002-diff-basic.sh
t4003-diff-rename-1.sh
t4004-diff-rename-symlink.sh
t4005-diff-rename-2.sh
t4006-diff-mode.sh
t4007-rename-3.sh
t4008-diff-break-rewrite.sh
t4009-diff-rename-4.sh
t4010-diff-pathspec.sh
t4011-diff-symlink.sh Fix 'git diff --no-index' with a non-existing symlink target 16 years ago
t4012-diff-binary.sh
t4013-diff-various.sh Skip timestamp differences for diff --no-index 16 years ago
t4014-format-patch.sh Merge branch 'jc/maint-format-patch-o-relative' into maint 16 years ago
t4015-diff-whitespace.sh Merge branch 'kc/maint-diff-bwi-fix' into maint 16 years ago
t4016-diff-quote.sh
t4017-diff-retval.sh
t4017-quiet.sh
t4018-diff-funcname.sh
t4019-diff-wserror.sh
t4020-diff-external.sh Bugfix: GIT_EXTERNAL_DIFF with more than one changed files 16 years ago
t4021-format-patch-numbered.sh
t4021-format-patch-signer-mime.sh
t4022-diff-rewrite.sh
t4023-diff-rename-typechange.sh
t4024-diff-optimize-common.sh
t4025-hunk-header.sh
t4026-color.sh
t4027-diff-submodule.sh
t4028-format-patch-mime-headers.sh
t4029-diff-trailing-space.sh Rename diff.suppress-blank-empty to diff.suppressBlankEmpty 16 years ago
t4030-diff-textconv.sh Merge branch 'jc/maint-1.6.0-split-diff-metainfo' into jc/maint-split-diff-metainfo 16 years ago
t4031-diff-rewrite-binary.sh Fix t4031 16 years ago
t4032-diff-inter-hunk-context.sh diff: add option to show context between close hunks 16 years ago
t4033-diff-patience.sh Introduce the diff option '--patience' 16 years ago
t4034-diff-words.sh Change the spelling of "wordregex". 16 years ago
t4100-apply-stat.sh
t4101-apply-nonl.sh
t4102-apply-rename.sh
t4103-apply-binary.sh
t4104-apply-boundary.sh
t4105-apply-fuzz.sh
t4106-apply-stdin.sh Resurrect "git apply --flags -" to read from the standard input 16 years ago
t4109-apply-multifrag.sh
t4110-apply-scan.sh
t4112-apply-renames.sh
t4113-apply-ending.sh
t4114-apply-typechange.sh diff.c: output correct index lines for a split diff 16 years ago
t4115-apply-symlink.sh
t4116-apply-reverse.sh
t4117-apply-reject.sh
t4118-apply-empty-context.sh
t4119-apply-config.sh
t4120-apply-popt.sh
t4121-apply-diffs.sh
t4122-apply-symlink-inside.sh
t4123-apply-shrink.sh
t4124-apply-ws-rule.sh
t4125-apply-ws-fuzz.sh
t4126-apply-empty.sh
t4127-apply-same-fn.sh
t4128-apply-root.sh
t4129-apply-samemode.sh builtin-apply: prevent non-explicit permission changes 16 years ago
t4150-am.sh git-am: Add --ignore-date option 16 years ago
t4151-am-abort.sh
t4200-rerere.sh
t4201-shortlog.sh
t4202-log.sh t/t4202-log.sh: Add testcases 16 years ago
t4203-mailmap.sh Change current mailmap usage to do matching on both name and email of author/committer. 16 years ago
t4252-am-options.sh git-am: implement --reject option passed to git-apply 16 years ago
t5000-tar-tree.sh Use test-chmtime -v instead of perl in t5000 to get mtime of a file 16 years ago
t5100-mailinfo.sh Merge branch 'ks/maint-mailinfo-folded' 16 years ago
t5300-pack-object.sh Merge branch 'maint' 16 years ago
t5301-sliding-window.sh
t5302-pack-index.sh Force t5302 to use a single thread 16 years ago
t5303-pack-corruption-resilience.sh t5303: fix printf format string for portability 16 years ago
t5304-prune.sh gc: make --prune useful again by accepting an optional parameter 16 years ago
t5305-include-tag.sh
t5306-pack-nobase.sh
t5307-pack-missing-commit.sh revision traversal and pack: notice and die on missing commit 16 years ago
t5400-send-pack.sh receive-pack: receive.denyDeleteCurrent 16 years ago
t5401-update-hooks.sh
t5402-post-merge-hook.sh
t5403-post-checkout-hook.sh
t5404-tracking-branches.sh
t5405-send-pack-rewind.sh
t5406-remote-rejects.sh
t5500-fetch-pack.sh
t5502-quickfetch.sh
t5503-tagfollow.sh
t5505-remote.sh Warn use of "origin" when remotes/origin/HEAD is dangling 16 years ago
t5510-fetch.sh
t5511-refspec.sh
t5512-ls-remote.sh
t5513-fetch-track.sh
t5515-fetch-merge-logic.sh
t5516-fetch-push.sh receive-pack: explain what to do when push updates the current branch 16 years ago
t5517-push-mirror.sh
t5518-fetch-exit-status.sh
t5519-push-alternates.sh revision traversal: allow UNINTERESTING objects to be missing 16 years ago
t5520-pull.sh
t5521-pull-options.sh Teach/Fix pull/fetch -q/-v options 16 years ago
t5521-pull-symlink.sh git-sh-setup: Fix scripts whose PWD is a symlink into a git work-dir 16 years ago
t5530-upload-pack-error.sh
t5540-http-push.sh use a hash of the lock token as the suffix for PUT/MOVE 16 years ago
t5600-clone-fail-cleanup.sh
t5601-clone.sh Install the default "master" branch configuration after cloning a void 16 years ago
t5602-clone-remote-exec.sh
t5700-clone-reference.sh
t5701-clone-local.sh Merge branch 'js/maint-all-implies-HEAD' 16 years ago
t5702-clone-options.sh
t5704-bundle.sh bundle: allow rev-list options to exclude annotated tags 16 years ago
t5710-info-alternate.sh
t6000lib.sh
t6001-rev-list-graft.sh
t6002-rev-list-bisect.sh
t6003-rev-list-topo-order.sh
t6004-rev-list-path-optim.sh
t6005-rev-list-count.sh
t6006-rev-list-format.sh expand --pretty=format color options 16 years ago
t6007-rev-list-cherry-pick-file.sh
t6008-rev-list-submodule.sh
t6009-rev-list-parent.sh
t6010-merge-base.sh
t6011-rev-list-with-bad-commit.sh
t6012-rev-list-simplify.sh
t6013-rev-list-reverse-parents.sh
t6014-rev-list-all.sh revision walker: include a detached HEAD in --all 16 years ago
t6020-merge-df.sh
t6021-merge-criss-cross.sh
t6022-merge-rename.sh
t6023-merge-file.sh
t6023-merge-rename-nocruft.sh
t6024-recursive-merge.sh merge-recursive: mark rename/delete conflict as unmerged 16 years ago
t6025-merge-symlinks.sh Avoid using non-portable `echo -n` in tests. 16 years ago
t6026-merge-attr.sh
t6027-merge-binary.sh
t6028-merge-up-to-date.sh
t6029-merge-subtree.sh
t6030-bisect-porcelain.sh bisect: fix "git bisect skip <commit>" and add tests cases 16 years ago
t6031-merge-recursive.sh
t6032-merge-large-rename.sh
t6033-merge-crlf.sh
t6040-tracking-info.sh
t6101-rev-parse-parents.sh
t6120-describe.sh Merge branch 'sp/maint-describe-all-tag-warning' into maint 16 years ago
t6200-fmt-merge-msg.sh
t6300-for-each-ref.sh
t7001-mv.sh Merge branch 'maint-1.6.0' into maint 16 years ago
t7002-grep.sh grep: grep cache entries if they are "assume unchanged" 16 years ago
t7003-filter-branch.sh filter-branch -d: Export GIT_DIR earlier 16 years ago
t7004-tag.sh git-tag: Add --contains option 16 years ago
t7005-editor.sh
t7007-show.sh git-show: do not segfault when showing a bad tag 16 years ago
t7010-setup.sh
t7101-reset.sh
t7102-reset.sh
t7103-reset-bare.sh
t7104-reset.sh
t7201-co.sh Merge branch 'jc/maint-co-track' into maint 16 years ago
t7300-clean.sh
t7400-submodule-basic.sh submodule: warn about non-submodules 16 years ago
t7401-submodule-summary.sh
t7402-submodule-rebase.sh
t7403-submodule-sync.sh
t7500-commit.sh t7501-commit.sh: explicitly check that -F prevents invoking the editor 16 years ago
t7501-commit.sh t7501-commit.sh: explicitly check that -F prevents invoking the editor 16 years ago
t7502-commit.sh wt-status: load diff ui config 16 years ago
t7502-status.sh
t7503-pre-commit-hook.sh
t7504-commit-msg-hook.sh
t7505-prepare-commit-msg-hook.sh
t7506-status-submodule.sh
t7507-commit-verbose.sh status: show "-v" diff even for initial commit 16 years ago
t7600-merge.sh
t7601-merge-pull-config.sh
t7602-merge-octopus-many.sh
t7603-merge-reduce-heads.sh
t7604-merge-custom-message.sh
t7605-merge-resolve.sh
t7606-merge-custom.sh
t7607-merge-overwrite.sh merge-recursive: do not clobber untracked working tree garbage 16 years ago
t7610-mergetool.sh mergetool: fix running mergetool in sub-directories 16 years ago
t7700-repack.sh t7700: demonstrate misbehavior of 'repack -a' when local packs exist 16 years ago
t7701-repack-unpack-unreachable.sh Windows: Fix intermittent failures of t7701 16 years ago
t8001-annotate.sh
t8002-blame.sh
t8003-blame.sh
t8004-blame.sh
t8005-blame-i18n.sh
t9001-send-email.sh send-email: do not reverse the command line arguments 16 years ago
t9100-git-svn-basic.sh git-svn: proper detection of bare repositories 16 years ago
t9101-git-svn-props.sh
t9102-git-svn-deep-rmdir.sh
t9103-git-svn-tracked-directory-removed.sh
t9104-git-svn-follow-parent.sh Merge branch 'maint' 16 years ago
t9105-git-svn-commit-diff.sh
t9106-git-svn-commit-diff-clobber.sh
t9106-git-svn-dcommit-clobber-series.sh
t9107-git-svn-migrate.sh
t9108-git-svn-glob.sh
t9108-git-svn-multi-glob.sh
t9110-git-svn-use-svm-props.sh
t9111-git-svn-use-svnsync-props.sh
t9112-git-svn-md5less-file.sh
t9113-git-svn-dcommit-new-file.sh
t9114-git-svn-dcommit-merge.sh
t9115-git-svn-dcommit-funky-renames.sh
t9116-git-svn-log.sh
t9117-git-svn-init-clone.sh
t9118-git-svn-funky-branch-names.sh
t9119-git-svn-info.sh
t9120-git-svn-clone-with-percent-escapes.sh
t9121-git-svn-fetch-renamed-dir.sh
t9122-git-svn-author.sh
t9123-git-svn-rebuild-with-rewriteroot.sh
t9124-git-svn-dcommit-auto-props.sh
t9125-git-svn-multi-glob-branch-names.sh
t9126-git-svn-follow-deleted-readded-directory.sh
t9127-git-svn-partial-rebuild.sh
t9128-git-svn-cmd-branch.sh git-svn: Make branch use correct svn-remote 16 years ago
t9129-git-svn-i18n-commitencoding.sh git-svn: fix SVN 1.1.x compatibility 16 years ago
t9130-git-svn-authors-file.sh git-svn: add --authors-file test 16 years ago
t9131-git-svn-empty-symlink.sh git-svn: allow disabling expensive broken symlink checks 16 years ago
t9132-git-svn-broken-symlink.sh git-svn: better attempt to handle broken symlink updates 16 years ago
t9133-git-svn-nested-git-repo.sh git-svn: avoid importing nested git repos 16 years ago
t9134-git-svn-ignore-paths.sh git-svn: Add test for --ignore-paths parameter 16 years ago
t9135-git-svn-moved-branch-empty-file.sh test case for regression caused by git-svn empty symlink fix 16 years ago
t9200-git-cvsexportcommit.sh
t9300-fast-import.sh Merge branch 'maint' to sync with GIT 1.6.0.6 16 years ago
t9301-fast-export.sh tests: fix "export var=val" 16 years ago
t9400-git-cvsserver-server.sh Avoid using non-portable `echo -n` in tests. 16 years ago
t9401-git-cvsserver-crlf.sh
t9500-gitweb-standalone-no-errors.sh gitweb: Fix warnings with override permitted but no repo override 16 years ago
t9600-cvsimport.sh
t9700-perl-git.sh
test-lib.sh Merge branch 'maint' 16 years ago
test4012.png
test9200a.png
test9200b.png

README

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 ***
* ok 1: .git/objects should be empty after git-init in an empty repo.
* ok 2: .git/objects should have 256 subdirectories.
* ok 3: git-update-index without --add should fail adding.
...
* ok 23: no diff after checkout and git-update-index --refresh.
* passed all 23 test(s)
*** t0100-environment-names.sh ***
* ok 1: using old names should issue warnings.
* ok 2: using old names but having new names should not issue warnings.
...

Or you can run each test individually from command line, like
this:

$ sh ./t3001-ls-files-killed.sh
* ok 1: git-update-index --add to add various paths.
* ok 2: git-ls-files -k to show killed files.
* ok 3: validate git-ls-files -k output.
* passed all 3 test(s)

You can pass --verbose (or -v), --debug (or -d), and --immediate
(or -i) command line argument to the test.

--verbose::
This makes the test more verbose. Specifically, the
command being run and their output if any are also
output.

--debug::
This may help the person who is developing a new test.
It causes the command defined with test_debug to run.

--immediate::
This causes the test to immediately exit upon the first
failed test.

--long-tests::
This causes additional long-running tests to be run (where
available), for more exhaustive testing.


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.

Note that some tests in the existing test suite rely on previous
test item, so you cannot arbitrarily disable one and expect the
remainder of test to check what the test originally was intended
to check.


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. A 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" with copyright notices, and an
assignment to variable 'test_description', like this:

#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#

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'
if you must know, but I do not think you care.

- 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.


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 <message> <script>

This takes two strings as parameter, 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)'

- test_expect_failure <message> <script>

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.

- 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.

- 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 stated. 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.

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.