This mostly involved futzing around with some of the less intuitive
parts of Unix's named-pipes behavior.
This is a bit important since the tests can quickly generate several
gigabytes of trace output.
The main change here from the previous test framework design is:
1. Powerloss testing remains in-process, speeding up testing.
2. The state of a test, included all powerlosses, is encoded in the
test id + leb16 encoded powerloss string. This means exhaustive
testing can be run in CI, but then easily reproduced locally with
full debugger support.
For example:
./scripts/test.py test_dirs#reentrant_many_dir#10#1248g1g2 --gdb
Will run the test test_dir, case reentrant_many_dir, permutation #10,
with powerlosses at 1, 2, 4, 8, 16, and 32 cycles. Dropping into gdb
if an assert fails.
The changes to the block-device are a work-in-progress for a
lazily-allocated/copy-on-write block device that I'm hoping will keep
exhaustive testing relatively low-cost.
This simplifies the interaction between code generation and the
test-runner.
In theory it also reduces compilation dependencies, but internal tests
make this difficult.
This mostly required names for each test case, declarations of
previously-implicit variables since the new test framework is more
conservative with what it declares (the small extra effort to add
declarations is well worth the simplicity and improved readability),
and tweaks to work with not-really-constant defines.
Also renamed test_ -> test, replacing the old ./scripts/test.py,
unfortunately git seems to have had a hard time with this.
- Added --exec for wrapping the test-runner with external commands, such as
Qemu or Valgrind.
- Added --valgrind, which just aliases --exec=valgrind with a few extra
flags useful during testing.
- Dropped the "valgrind" type for tests. These aren't separate tests
that run in the test-runner, and I don't see a need for disabling
Valgrind for any tests. This can be added back later if needed.
- Readded support for dropping directly into gdb after a test failure,
either at the assert failure, entry point of test case, or entry point
of the test runner with --gdb, --gdb-case, or --gdb-main.
- Added --isolate for running each test permutation in its own process,
this is required for associating Valgrind errors with the right test
case.
- Fixed an issue where explicit test identifier conflicted with
per-stage test identifiers generated as a part of --by-suite and
--by-case.
Previously test defines were implemented using layers of index-mapped
uintmax_t arrays. This worked well for lookup, but limited defines to
constants computed at compile-time. Since test defines themselves are
actually calculated at _run-time_ (yeah, they have deviated quite
a bit from the original, compile-time evaluated defines, which makes
the name make less sense), this means defines can't depend on other
defines. Which was limiting since a lot of test defines relied on
defines generated from the geometry being tested.
This new implementation uses callbacks for the per-case defines. This
means they can easily contain full C statements, which can depend on
other test defines. This does means you can create infinitely-recursive
defines, but the test-runner will just break at run-time so don't do that.
One concern is that there might be a performance hit for evaluating all
defines through callbacks, but if there is it is well below the noise
floor:
- constants: 43.55s
- callbacks: 42.05s
- Added internal tests, which can run tests inside other source files,
allowing access to "private" functions and data
Note this required a special bit of handling our defining and later
undefining test configurations to not polute the namespace of the
source file, since it can end up with test cases from different
suites/configuration namespaces.
- Removed unnecessary/unused permutation argument to generated test
functions.
- Some cleanup to progress output of test.py.
In the test-runner, defines are parameterized constants (limited
to integers) that are generated from the test suite tomls resulting
in many permutations of each test.
In order to make this efficient, these defines are implemented as
multi-layered lookup tables, using per-layer/per-scope indirect
mappings. This lets the test-runner and test suites define their
own defines with compile-time indexes independently. It also makes
building of the lookup tables very efficient, since they can be
incrementally populated as we expand the test permutations.
The four current define layers and when we need to build them:
layer defines predefine_map define_map
user-provided overrides per-run per-run per-suite
per-permutation defines per-perm per-case per-perm
per-geometry defines per-perm compile-time -
default defines compile-time compile-time -
- Added filtering based on suite, case, perm, type, geometry
- Added --skip, --count, and --every (will be used for parallelism)
- Implemented --list-defines
- Better helptext for flags with arguments
- Other minor tweaks
- Indirect index map instead of bitmap+sparse array
- test_define_t and test_type_t
- Added back conditional filtering
- Added suite-level defines and filtering
This moves defines entirely into the runtime of the test_runner,
simplifying thing and reducing the amount of generated code that needs
to be build, at the cost of limiting test-defines to uintmax_t types.
This is implemented using a set of index-based scopes (created by
test.py) that allow different layers to override defines from other
layers, accessible through the global `test_define` function.
layers:
1. command-line overrides
2. per-case defines
3. per-geometry defines
This is to try a different design for testing, the goals are to make the
test infrastructure a bit simpler, with clear stages for building and
running, and faster, by avoiding rebuilding lfs.c n-times.
Christopher Haster