4e1be63c3b
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>
266 lines
8.8 KiB
Plaintext
266 lines
8.8 KiB
Plaintext
Core GIT Tests
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==============
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This directory holds many test scripts for core GIT tools. The
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first part of this short document describes how to run the tests
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and read their output.
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When fixing the tools or adding enhancements, you are strongly
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encouraged to add tests in this directory to cover what you are
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trying to fix or enhance. The later part of this short document
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describes how your test scripts should be organized.
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Running Tests
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-------------
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The easiest way to run tests is to say "make". This runs all
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the tests.
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*** t0000-basic.sh ***
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* ok 1: .git/objects should be empty after git-init in an empty repo.
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* ok 2: .git/objects should have 256 subdirectories.
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* ok 3: git-update-index without --add should fail adding.
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...
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* ok 23: no diff after checkout and git-update-index --refresh.
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* passed all 23 test(s)
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*** t0100-environment-names.sh ***
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* ok 1: using old names should issue warnings.
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* ok 2: using old names but having new names should not issue warnings.
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...
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Or you can run each test individually from command line, like
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this:
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$ sh ./t3001-ls-files-killed.sh
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* ok 1: git-update-index --add to add various paths.
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* ok 2: git-ls-files -k to show killed files.
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* ok 3: validate git-ls-files -k output.
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* passed all 3 test(s)
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You can pass --verbose (or -v), --debug (or -d), and --immediate
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(or -i) command line argument to the test, or by setting GIT_TEST_OPTS
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appropriately before running "make".
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--verbose::
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This makes the test more verbose. Specifically, the
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command being run and their output if any are also
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output.
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--debug::
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This may help the person who is developing a new test.
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It causes the command defined with test_debug to run.
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--immediate::
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This causes the test to immediately exit upon the first
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failed test.
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--long-tests::
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This causes additional long-running tests to be run (where
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available), for more exhaustive testing.
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--valgrind::
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Execute all Git binaries with valgrind and exit with status
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126 on errors (just like regular tests, this will only stop
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the test script when running under -i). Valgrind errors
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go to stderr, so you might want to pass the -v option, too.
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Skipping Tests
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--------------
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In some environments, certain tests have no way of succeeding
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due to platform limitation, such as lack of 'unzip' program, or
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filesystem that do not allow arbitrary sequence of non-NUL bytes
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as pathnames.
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You should be able to say something like
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$ GIT_SKIP_TESTS=t9200.8 sh ./t9200-git-cvsexport-commit.sh
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and even:
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$ GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make
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to omit such tests. The value of the environment variable is a
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SP separated list of patterns that tells which tests to skip,
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and either can match the "t[0-9]{4}" part to skip the whole
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test, or t[0-9]{4} followed by ".$number" to say which
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particular test to skip.
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Note that some tests in the existing test suite rely on previous
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test item, so you cannot arbitrarily disable one and expect the
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remainder of test to check what the test originally was intended
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to check.
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Naming Tests
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------------
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The test files are named as:
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tNNNN-commandname-details.sh
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where N is a decimal digit.
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First digit tells the family:
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0 - the absolute basics and global stuff
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1 - the basic commands concerning database
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2 - the basic commands concerning the working tree
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3 - the other basic commands (e.g. ls-files)
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4 - the diff commands
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5 - the pull and exporting commands
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6 - the revision tree commands (even e.g. merge-base)
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7 - the porcelainish commands concerning the working tree
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8 - the porcelainish commands concerning forensics
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9 - the git tools
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Second digit tells the particular command we are testing.
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Third digit (optionally) tells the particular switch or group of switches
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we are testing.
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If you create files under t/ directory (i.e. here) that is not
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the top-level test script, never name the file to match the above
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pattern. The Makefile here considers all such files as the
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top-level test script and tries to run all of them. A care is
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especially needed if you are creating a common test library
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file, similar to test-lib.sh, because such a library file may
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not be suitable for standalone execution.
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Writing Tests
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-------------
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The test script is written as a shell script. It should start
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with the standard "#!/bin/sh" with copyright notices, and an
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assignment to variable 'test_description', like this:
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#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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test_description='xxx test (option --frotz)
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This test registers the following structure in the cache
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and tries to run git-ls-files with option --frotz.'
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Source 'test-lib.sh'
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--------------------
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After assigning test_description, the test script should source
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test-lib.sh like this:
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. ./test-lib.sh
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This test harness library does the following things:
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- If the script is invoked with command line argument --help
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(or -h), it shows the test_description and exits.
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- Creates an empty test directory with an empty .git/objects
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database and chdir(2) into it. This directory is 't/trash directory'
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if you must know, but I do not think you care.
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- Defines standard test helper functions for your scripts to
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use. These functions are designed to make all scripts behave
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consistently when command line arguments --verbose (or -v),
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--debug (or -d), and --immediate (or -i) is given.
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End with test_done
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------------------
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Your script will be a sequence of tests, using helper functions
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from the test harness library. At the end of the script, call
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'test_done'.
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Test harness library
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--------------------
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There are a handful helper functions defined in the test harness
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library for your script to use.
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- test_expect_success <message> <script>
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This takes two strings as parameter, and evaluates the
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<script>. If it yields success, test is considered
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successful. <message> should state what it is testing.
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Example:
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test_expect_success \
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'git-write-tree should be able to write an empty tree.' \
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'tree=$(git-write-tree)'
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- test_expect_failure <message> <script>
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This is NOT the opposite of test_expect_success, but is used
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to mark a test that demonstrates a known breakage. Unlike
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the usual test_expect_success tests, which say "ok" on
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success and "FAIL" on failure, this will say "FIXED" on
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success and "still broken" on failure. Failures from these
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tests won't cause -i (immediate) to stop.
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- test_debug <script>
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This takes a single argument, <script>, and evaluates it only
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when the test script is started with --debug command line
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argument. This is primarily meant for use during the
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development of a new test script.
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- test_done
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Your test script must have test_done at the end. Its purpose
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is to summarize successes and failures in the test script and
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exit with an appropriate error code.
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- test_tick
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Make commit and tag names consistent by setting the author and
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committer times to defined stated. Subsequent calls will
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advance the times by a fixed amount.
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- test_commit <message> [<filename> [<contents>]]
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Creates a commit with the given message, committing the given
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file with the given contents (default for both is to reuse the
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message string), and adds a tag (again reusing the message
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string as name). Calls test_tick to make the SHA-1s
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reproducible.
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- test_merge <message> <commit-or-tag>
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Merges the given rev using the given message. Like test_commit,
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creates a tag and calls test_tick before committing.
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Tips for Writing Tests
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----------------------
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As with any programming projects, existing programs are the best
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source of the information. However, do _not_ emulate
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t0000-basic.sh when writing your tests. The test is special in
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that it tries to validate the very core of GIT. For example, it
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knows that there will be 256 subdirectories under .git/objects/,
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and it knows that the object ID of an empty tree is a certain
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40-byte string. This is deliberately done so in t0000-basic.sh
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because the things the very basic core test tries to achieve is
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to serve as a basis for people who are changing the GIT internal
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drastically. For these people, after making certain changes,
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not seeing failures from the basic test _is_ a failure. And
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such drastic changes to the core GIT that even changes these
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otherwise supposedly stable object IDs should be accompanied by
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an update to t0000-basic.sh.
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However, other tests that simply rely on basic parts of the core
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GIT working properly should not have that level of intimate
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knowledge of the core GIT internals. If all the test scripts
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hardcoded the object IDs like t0000-basic.sh does, that defeats
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the purpose of t0000-basic.sh, which is to isolate that level of
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validation in one place. Your test also ends up needing
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updating when such a change to the internal happens, so do _not_
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do it and leave the low level of validation to t0000-basic.sh.
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