3 A testsuite covering functionality of btrfs-progs, ie. the checker, image, mkfs
4 and similar tools. There are no special requirements on kernel features, the
5 tests build on top of the core functionality like snapshots and device
6 management. In some cases optional features are turned on by mkfs and the
7 filesystem image could be mounted, such tests might fail if there's lack of
12 Run the tests from the top directory:
20 or selectively from the `tests/` directory:
27 The verbose output of the tests is logged into a file named after the test
28 category, eg. `fsck-tests-results.txt`.
32 The test are prefixed by a number for ordering and uniqueness. To run a
39 where `MASK` is a glob expression that will execute only tests
40 that match the MASK. Here the test number comes handy:
43 $ make TEST=001\* test-fsck
44 $ TEST=001\* ./fsck-tests.sh
47 will run the first test in fsck-tests subdirectory.
54 * tests targeted at bugs that are fixable by fsck
56 *tests/convert-tests/:*
58 * coverage tests of ext2/3/4 and btrfs-convert options
62 * collection of fuzzed or crafted images
63 * tests that are supposed to run various utilities on the images and not
68 * tests for command line interface, option coverage, weird option combinations that should not work
69 * not necessary to do any functional testing, could be rather lightweight
70 * functional tests should go to to other test dirs
71 * the driver script will only execute `./test.sh` in the test directory
75 * anything that does not fit to the above, the test driver script will only
76 execute `./test.sh` in the test directory
79 *tests/common.convert:*
81 * script with shell helpers, separated by functionality
85 * default testing image, the file is never deleted by the scripts but
86 truncated to 0 bytes, so it keeps it's permissions. It's eg. possible to
87 host it on NFS, make it `chmod a+w` for root.
90 ## Other tuning, environment variables
94 It's possible to wrap the tested commands to utilities that might do more
95 checking or catch failures at runtime. This can be done by setting the
96 `INSTRUMENT` environment variable:
99 INSTRUMENT=valgrind ./fuzz-tests.sh # in tests/
100 make INSTRUMENT=valgrind test-fuzz # in the top directory
103 The variable is prepended to the command *unquoted*, all sorts of shell tricks
106 Note: instrumentation is not applied to privileged commands (anything that uses
111 Setting the variable `TEST_LOG=tty` will print all commands executed by some of
112 the wrappers (`run_check` etc), other commands are not printed to the terminal
113 (but the full output is in the log).
117 Some commands require root privileges (to mount/umount, access loop devices).
118 It is assumed that `sudo` will work in some way (no password, password asked
119 and cached). Note that instrumentation is not applied in this case, for safety
120 reasons. You need to modify the test script instead.
124 The tests are supposed to cleanup after themselves if they pass. In case of
125 failure, the rest of the tests are skipped and intermediate files, mounts and
126 loop devices are kept. This should help to investigate the test failure but at
127 least the mounts and loop devices need to be cleaned before the next run.
129 This is partially done by the script `clean-tests.sh`, you may want to check
130 the loop devices as they are managed on a per-test basis.
132 ### Prototyping tests, quick tests
134 There's a script `test-console.sh` that will run shell commands in a loop and
135 logs the output with the testing environment set up.
139 1. Pick the category for the new test or fallback to `misc-tests` if not sure. For
140 an easy start copy an existing `test.sh` script from some test that might be
141 close to the purpose of your new test. The environment setup includes the
142 common scripts and/or prepares the test devices. Other scripts contain examples
143 how to do mkfs, mount, unmount, check, etc.
145 2. Use the highest unused number in the sequence, write a short descriptive title
146 and join by dashes `-`. This will become the directory name, eg. `012-subvolume-sync-must-wait`.
148 3. Write a short description of the bug and how it's tested to the comment at the
149 begining of `test.sh`. You don't need to add the file to git yet.
151 4. Write the test commands, comment anything that's not obvious.
153 5. Test your test. Use the `TEST` variable to jump right to your test:
155 $ make TEST=012\* tests-misc # from top directory
156 $ TEST=012\* ./misc-tests.sh # from tests/
159 6. The commit changelog should reference a commit that either introduced or
160 fixed the bug (or both). Subject line of the shall mention the name of the
161 new directory for ease of search, eg. `btrfs-progs: tests: add 012-subvolume-sync-must-wait`
163 ### Crafted/fuzzed images
165 Images that are create by fuzzing or specially crafted to trigger some error
166 conditions should be added to the directory *fuzz-tests/images*, accompanied by
167 a textual description of the source (bugzilla, mail), the reporter, brief
168 description of the problem or the stack trace.
170 If you have a fix for the problem, please submit it prior to the test image, so
171 the fuzz tests always succeed when run on random checked out. This helps