X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=t%2FREADME;h=2aceb67c785b40642818849d80c1f926b0897af9;hb=v1.7.3.1-35-g00648ba;hp=410499a09645634349d7685e728228f238021c34;hpb=b480d38dab815e780234d0887f4185afc3db1b64;p=git.git

diff --git a/t/README b/t/README
index 410499a09..2aceb67c7 100644
--- a/t/README
+++ b/t/README
@@ -259,14 +259,23 @@ Do:
 	test ...
 
    That way all of the commands in your tests will succeed or fail. If
-   you must ignore the return value of something (e.g., the return
-   after unsetting a variable that was already unset is unportable) it's
-   best to indicate so explicitly with a semicolon:
+   you must ignore the return value of something, consider using a
+   helper function (e.g. use sane_unset instead of unset, in order
+   to avoid unportable return value for unsetting a variable that was
+   already unset), or prepending the command with test_might_fail or
+   test_must_fail.
 
-	unset HLAGH;
-	git merge hla &&
-	git push gh &&
-	test ...
+ - Check the test coverage for your tests. See the "Test coverage"
+   below.
+
+   Don't blindly follow test coverage metrics, they're a good way to
+   spot if you've missed something. If a new function you added
+   doesn't have any coverage you're probably doing something wrong,
+   but having 100% coverage doesn't necessarily mean that you tested
+   everything.
+
+   Tests that are likely to smoke out future regressions are better
+   than tests that just inflate the coverage metrics.
 
 Don't:
 
@@ -307,9 +316,21 @@ Keep in mind:
 Skipping tests
 --------------
 
-If you need to skip all the remaining tests you should set skip_all
-and immediately call test_done. The string you give to skip_all will
-be used as an explanation for why the test was skipped. for instance:
+If you need to skip tests you should do so be using the three-arg form
+of the test_* functions (see the "Test harness library" section
+below), e.g.:
+
+    test_expect_success PERL 'I need Perl' "
+        '$PERL_PATH' -e 'hlagh() if unf_unf()'
+    "
+
+The advantage of skipping tests like this is that platforms that don't
+have the PERL and other optional dependencies get an indication of how
+many tests they're missing.
+
+If the test code is too hairy for that (i.e. does a lot of setup work
+outside test assertions) you can also skip all remaining tests by
+setting skip_all and immediately call test_done:
 
 	if ! test_have_prereq PERL
 	then
@@ -317,6 +338,9 @@ be used as an explanation for why the test was skipped. for instance:
 	    test_done
 	fi
 
+The string you give to skip_all will be used as an explanation for why
+the test was skipped.
+
 End with test_done
 ------------------
 
@@ -350,6 +374,12 @@ library for your script to use.
 	test_expect_success TTY 'git --paginate rev-list uses a pager' \
 	    ' ... '
 
+   You can also supply a comma-separated list of prerequisites, in the
+   rare case where your test depends on more than one:
+
+	test_expect_success PERL,PYTHON 'yo dawg' \
+	    ' test $(perl -E 'print eval "1 +" . qx[python -c "print 2"]') == "4" '
+
  - test_expect_failure [<prereq>] <message> <script>
 
    This is NOT the opposite of test_expect_success, but is used
@@ -362,13 +392,6 @@ library for your script to use.
    Like test_expect_success this function can optionally use a three
    argument invocation with a prerequisite as the first argument.
 
- - test_expect_code [<prereq>] <code> <message> <script>
-
-   Analogous to test_expect_success, but pass the test if it exits
-   with a given exit <code>
-
- test_expect_code 1 'Merge with d/f conflicts' 'git merge "merge msg" B master'
-
  - test_debug <script>
 
    This takes a single argument, <script>, and evaluates it only
@@ -404,11 +427,12 @@ library for your script to use.
  - test_set_prereq SOME_PREREQ
 
    Set a test prerequisite to be used later with test_have_prereq. The
-   test-lib will set some prerequisites for you, e.g. PERL and PYTHON
-   which are derived from ./GIT-BUILD-OPTIONS (grep test_set_prereq
-   test-lib.sh for more). Others you can set yourself and use later
-   with either test_have_prereq directly, or the three argument
-   invocation of test_expect_success and test_expect_failure.
+   test-lib will set some prerequisites for you, see the
+   "Prerequisites" section below for a full list of these.
+
+   Others you can set yourself and use later with either
+   test_have_prereq directly, or the three argument invocation of
+   test_expect_success and test_expect_failure.
 
  - test_have_prereq SOME PREREQ
 
@@ -448,6 +472,15 @@ library for your script to use.
 	    'Perl API' \
 	    "$PERL_PATH" "$TEST_DIRECTORY"/t9700/test.pl
 
+ - test_expect_code <exit-code> <command>
+
+   Run a command and ensure that it exits with the given exit code.
+   For example:
+
+	test_expect_success 'Merge with d/f conflicts' '
+		test_expect_code 1 git merge "merge msg" B master
+	'
+
  - test_must_fail <git-command>
 
    Run a git command and ensure it fails in a controlled way.  Use
@@ -488,6 +521,45 @@ library for your script to use.
 		...
 	'
 
+Prerequisites
+-------------
+
+These are the prerequisites that the test library predefines with
+test_have_prereq.
+
+See the prereq argument to the test_* functions in the "Test harness
+library" section above and the "test_have_prereq" function for how to
+use these, and "test_set_prereq" for how to define your own.
+
+ - PERL & PYTHON
+
+   Git wasn't compiled with NO_PERL=YesPlease or
+   NO_PYTHON=YesPlease. Wrap any tests that need Perl or Python in
+   these.
+
+ - POSIXPERM
+
+   The filesystem supports POSIX style permission bits.
+
+ - BSLASHPSPEC
+
+   Backslashes in pathspec are not directory separators. This is not
+   set on Windows. See 6fd1106a for details.
+
+ - EXECKEEPSPID
+
+   The process retains the same pid across exec(2). See fb9a2bea for
+   details.
+
+ - SYMLINKS
+
+   The filesystem we're on supports symbolic links. E.g. a FAT
+   filesystem doesn't support these. See 704a3143 for details.
+
+ - SANITY
+
+   Test is not run by root user, and an attempt to write to an
+   unwritable file is expected to fail correctly.
 
 Tips for Writing Tests
 ----------------------
@@ -515,3 +587,115 @@ 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.
+
+Test coverage
+-------------
+
+You can use the coverage tests to find code paths that are not being
+used or properly exercised yet.
+
+To do that, run the coverage target at the top-level (not in the t/
+directory):
+
+    make coverage
+
+That'll compile Git with GCC's coverage arguments, and generate a test
+report with gcov after the tests finish. Running the coverage tests
+can take a while, since running the tests in parallel is incompatible
+with GCC's coverage mode.
+
+After the tests have run you can generate a list of untested
+functions:
+
+    make coverage-untested-functions
+
+You can also generate a detailed per-file HTML report using the
+Devel::Cover module. To install it do:
+
+   # On Debian or Ubuntu:
+   sudo aptitude install libdevel-cover-perl
+
+   # From the CPAN with cpanminus
+   curl -L http://cpanmin.us | perl - --sudo --self-upgrade
+   cpanm --sudo Devel::Cover
+
+Then, at the top-level:
+
+    make cover_db_html
+
+That'll generate a detailed cover report in the "cover_db_html"
+directory, which you can then copy to a webserver, or inspect locally
+in a browser.
+
+Smoke testing
+-------------
+
+The Git test suite has support for smoke testing. Smoke testing is
+when you submit the results of a test run to a central server for
+analysis and aggregation.
+
+Running a smoke tester is an easy and valuable way of contributing to
+Git development, particularly if you have access to an uncommon OS on
+obscure hardware.
+
+After building Git you can generate a smoke report like this in the
+"t" directory:
+
+    make clean smoke
+
+You can also pass arguments via the environment. This should make it
+faster:
+
+    GIT_TEST_OPTS='--root=/dev/shm' TEST_JOBS=10 make clean smoke
+
+The "smoke" target will run the Git test suite with Perl's
+"TAP::Harness" module, and package up the results in a .tar.gz archive
+with "TAP::Harness::Archive". The former is included with Perl v5.10.1
+or later, but you'll need to install the latter from the CPAN. See the
+"Test coverage" section above for how you might do that.
+
+Once the "smoke" target finishes you'll see a message like this:
+
+    TAP Archive created at <path to git>/t/test-results/git-smoke.tar.gz
+
+To upload the smoke report you need to have curl(1) installed, then
+do:
+
+    make smoke_report
+
+To upload the report anonymously. Hopefully that'll return something
+like "Reported #7 added.".
+
+If you're going to be uploading reports frequently please request a
+user account by E-Mailing gitsmoke@v.nix.is. Once you have a username
+and password you'll be able to do:
+
+    SMOKE_USERNAME=<username> SMOKE_PASSWORD=<password> make smoke_report
+
+You can also add an additional comment to attach to the report, and/or
+a comma separated list of tags:
+
+    SMOKE_USERNAME=<username> SMOKE_PASSWORD=<password> \
+        SMOKE_COMMENT=<comment> SMOKE_TAGS=<tags> \
+        make smoke_report
+
+Once the report is uploaded it'll be made available at
+http://smoke.git.nix.is, here's an overview of Recent Smoke Reports
+for Git:
+
+    http://smoke.git.nix.is/app/projects/smoke_reports/1
+
+The reports will also be mirrored to GitHub every few hours:
+
+    http://github.com/gitsmoke/smoke-reports
+
+The Smolder SQLite database is also mirrored and made available for
+download:
+
+    http://github.com/gitsmoke/smoke-database
+
+Note that the database includes hashed (with crypt()) user passwords
+and E-Mail addresses. Don't use a valuable password for the smoke
+service if you have an account, or an E-Mail address you don't want to
+be publicly known. The user accounts are just meant to be convenient
+labels, they're not meant to be secure.