You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
449 lines
15 KiB
449 lines
15 KiB
lit - LLVM Integrated Tester
|
|
============================
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
:program:`lit` [*options*] [*tests*]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
:program:`lit` is a portable tool for executing LLVM and Clang style test
|
|
suites, summarizing their results, and providing indication of failures.
|
|
:program:`lit` is designed to be a lightweight testing tool with as simple a
|
|
user interface as possible.
|
|
|
|
:program:`lit` should be run with one or more *tests* to run specified on the
|
|
command line. Tests can be either individual test files or directories to
|
|
search for tests (see :ref:`test-discovery`).
|
|
|
|
Each specified test will be executed (potentially in parallel) and once all
|
|
tests have been run :program:`lit` will print summary information on the number
|
|
of tests which passed or failed (see :ref:`test-status-results`). The
|
|
:program:`lit` program will execute with a non-zero exit code if any tests
|
|
fail.
|
|
|
|
By default :program:`lit` will use a succinct progress display and will only
|
|
print summary information for test failures. See :ref:`output-options` for
|
|
options controlling the :program:`lit` progress display and output.
|
|
|
|
:program:`lit` also includes a number of options for controlling how tests are
|
|
executed (specific features may depend on the particular test format). See
|
|
:ref:`execution-options` for more information.
|
|
|
|
Finally, :program:`lit` also supports additional options for only running a
|
|
subset of the options specified on the command line, see
|
|
:ref:`selection-options` for more information.
|
|
|
|
Users interested in the :program:`lit` architecture or designing a
|
|
:program:`lit` testing implementation should see :ref:`lit-infrastructure`.
|
|
|
|
GENERAL OPTIONS
|
|
---------------
|
|
|
|
.. option:: -h, --help
|
|
|
|
Show the :program:`lit` help message.
|
|
|
|
.. option:: -j N, --threads=N
|
|
|
|
Run ``N`` tests in parallel. By default, this is automatically chosen to
|
|
match the number of detected available CPUs.
|
|
|
|
.. option:: --config-prefix=NAME
|
|
|
|
Search for :file:`{NAME}.cfg` and :file:`{NAME}.site.cfg` when searching for
|
|
test suites, instead of :file:`lit.cfg` and :file:`lit.site.cfg`.
|
|
|
|
.. option:: -D NAME, -D NAME=VALUE, --param NAME, --param NAME=VALUE
|
|
|
|
Add a user defined parameter ``NAME`` with the given ``VALUE`` (or the empty
|
|
string if not given). The meaning and use of these parameters is test suite
|
|
dependent.
|
|
|
|
.. _output-options:
|
|
|
|
OUTPUT OPTIONS
|
|
--------------
|
|
|
|
.. option:: -q, --quiet
|
|
|
|
Suppress any output except for test failures.
|
|
|
|
.. option:: -s, --succinct
|
|
|
|
Show less output, for example don't show information on tests that pass.
|
|
|
|
.. option:: -v, --verbose
|
|
|
|
Show more information on test failures, for example the entire test output
|
|
instead of just the test result.
|
|
|
|
.. option:: -a, --show-all
|
|
|
|
Show more information about all tests, for example the entire test
|
|
commandline and output.
|
|
|
|
.. option:: --no-progress-bar
|
|
|
|
Do not use curses based progress bar.
|
|
|
|
.. option:: --show-unsupported
|
|
|
|
Show the names of unsupported tests.
|
|
|
|
.. option:: --show-xfail
|
|
|
|
Show the names of tests that were expected to fail.
|
|
|
|
.. _execution-options:
|
|
|
|
EXECUTION OPTIONS
|
|
-----------------
|
|
|
|
.. option:: --path=PATH
|
|
|
|
Specify an additional ``PATH`` to use when searching for executables in tests.
|
|
|
|
.. option:: --vg
|
|
|
|
Run individual tests under valgrind (using the memcheck tool). The
|
|
``--error-exitcode`` argument for valgrind is used so that valgrind failures
|
|
will cause the program to exit with a non-zero status.
|
|
|
|
When this option is enabled, :program:`lit` will also automatically provide a
|
|
"``valgrind``" feature that can be used to conditionally disable (or expect
|
|
failure in) certain tests.
|
|
|
|
.. option:: --vg-arg=ARG
|
|
|
|
When :option:`--vg` is used, specify an additional argument to pass to
|
|
:program:`valgrind` itself.
|
|
|
|
.. option:: --vg-leak
|
|
|
|
When :option:`--vg` is used, enable memory leak checks. When this option is
|
|
enabled, :program:`lit` will also automatically provide a "``vg_leak``"
|
|
feature that can be used to conditionally disable (or expect failure in)
|
|
certain tests.
|
|
|
|
.. option:: --time-tests
|
|
|
|
Track the wall time individual tests take to execute and includes the results
|
|
in the summary output. This is useful for determining which tests in a test
|
|
suite take the most time to execute. Note that this option is most useful
|
|
with ``-j 1``.
|
|
|
|
.. _selection-options:
|
|
|
|
SELECTION OPTIONS
|
|
-----------------
|
|
|
|
.. option:: --max-tests=N
|
|
|
|
Run at most ``N`` tests and then terminate.
|
|
|
|
.. option:: --max-time=N
|
|
|
|
Spend at most ``N`` seconds (approximately) running tests and then terminate.
|
|
|
|
.. option:: --shuffle
|
|
|
|
Run the tests in a random order.
|
|
|
|
ADDITIONAL OPTIONS
|
|
------------------
|
|
|
|
.. option:: --debug
|
|
|
|
Run :program:`lit` in debug mode, for debugging configuration issues and
|
|
:program:`lit` itself.
|
|
|
|
.. option:: --show-suites
|
|
|
|
List the discovered test suites and exit.
|
|
|
|
.. option:: --show-tests
|
|
|
|
List all of the discovered tests and exit.
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
|
|
:program:`lit` will exit with an exit code of 1 if there are any FAIL or XPASS
|
|
results. Otherwise, it will exit with the status 0. Other exit codes are used
|
|
for non-test related failures (for example a user error or an internal program
|
|
error).
|
|
|
|
.. _test-discovery:
|
|
|
|
TEST DISCOVERY
|
|
--------------
|
|
|
|
The inputs passed to :program:`lit` can be either individual tests, or entire
|
|
directories or hierarchies of tests to run. When :program:`lit` starts up, the
|
|
first thing it does is convert the inputs into a complete list of tests to run
|
|
as part of *test discovery*.
|
|
|
|
In the :program:`lit` model, every test must exist inside some *test suite*.
|
|
:program:`lit` resolves the inputs specified on the command line to test suites
|
|
by searching upwards from the input path until it finds a :file:`lit.cfg` or
|
|
:file:`lit.site.cfg` file. These files serve as both a marker of test suites
|
|
and as configuration files which :program:`lit` loads in order to understand
|
|
how to find and run the tests inside the test suite.
|
|
|
|
Once :program:`lit` has mapped the inputs into test suites it traverses the
|
|
list of inputs adding tests for individual files and recursively searching for
|
|
tests in directories.
|
|
|
|
This behavior makes it easy to specify a subset of tests to run, while still
|
|
allowing the test suite configuration to control exactly how tests are
|
|
interpreted. In addition, :program:`lit` always identifies tests by the test
|
|
suite they are in, and their relative path inside the test suite. For
|
|
appropriately configured projects, this allows :program:`lit` to provide
|
|
convenient and flexible support for out-of-tree builds.
|
|
|
|
.. _test-status-results:
|
|
|
|
TEST STATUS RESULTS
|
|
-------------------
|
|
|
|
Each test ultimately produces one of the following six results:
|
|
|
|
**PASS**
|
|
|
|
The test succeeded.
|
|
|
|
**XFAIL**
|
|
|
|
The test failed, but that is expected. This is used for test formats which allow
|
|
specifying that a test does not currently work, but wish to leave it in the test
|
|
suite.
|
|
|
|
**XPASS**
|
|
|
|
The test succeeded, but it was expected to fail. This is used for tests which
|
|
were specified as expected to fail, but are now succeeding (generally because
|
|
the feature they test was broken and has been fixed).
|
|
|
|
**FAIL**
|
|
|
|
The test failed.
|
|
|
|
**UNRESOLVED**
|
|
|
|
The test result could not be determined. For example, this occurs when the test
|
|
could not be run, the test itself is invalid, or the test was interrupted.
|
|
|
|
**UNSUPPORTED**
|
|
|
|
The test is not supported in this environment. This is used by test formats
|
|
which can report unsupported tests.
|
|
|
|
Depending on the test format tests may produce additional information about
|
|
their status (generally only for failures). See the :ref:`output-options`
|
|
section for more information.
|
|
|
|
.. _lit-infrastructure:
|
|
|
|
LIT INFRASTRUCTURE
|
|
------------------
|
|
|
|
This section describes the :program:`lit` testing architecture for users interested in
|
|
creating a new :program:`lit` testing implementation, or extending an existing one.
|
|
|
|
:program:`lit` proper is primarily an infrastructure for discovering and running
|
|
arbitrary tests, and to expose a single convenient interface to these
|
|
tests. :program:`lit` itself doesn't know how to run tests, rather this logic is
|
|
defined by *test suites*.
|
|
|
|
TEST SUITES
|
|
~~~~~~~~~~~
|
|
|
|
As described in :ref:`test-discovery`, tests are always located inside a *test
|
|
suite*. Test suites serve to define the format of the tests they contain, the
|
|
logic for finding those tests, and any additional information to run the tests.
|
|
|
|
:program:`lit` identifies test suites as directories containing ``lit.cfg`` or
|
|
``lit.site.cfg`` files (see also :option:`--config-prefix`). Test suites are
|
|
initially discovered by recursively searching up the directory hierarchy for
|
|
all the input files passed on the command line. You can use
|
|
:option:`--show-suites` to display the discovered test suites at startup.
|
|
|
|
Once a test suite is discovered, its config file is loaded. Config files
|
|
themselves are Python modules which will be executed. When the config file is
|
|
executed, two important global variables are predefined:
|
|
|
|
**lit_config**
|
|
|
|
The global **lit** configuration object (a *LitConfig* instance), which defines
|
|
the builtin test formats, global configuration parameters, and other helper
|
|
routines for implementing test configurations.
|
|
|
|
**config**
|
|
|
|
This is the config object (a *TestingConfig* instance) for the test suite,
|
|
which the config file is expected to populate. The following variables are also
|
|
available on the *config* object, some of which must be set by the config and
|
|
others are optional or predefined:
|
|
|
|
**name** *[required]* The name of the test suite, for use in reports and
|
|
diagnostics.
|
|
|
|
**test_format** *[required]* The test format object which will be used to
|
|
discover and run tests in the test suite. Generally this will be a builtin test
|
|
format available from the *lit.formats* module.
|
|
|
|
**test_source_root** The filesystem path to the test suite root. For out-of-dir
|
|
builds this is the directory that will be scanned for tests.
|
|
|
|
**test_exec_root** For out-of-dir builds, the path to the test suite root inside
|
|
the object directory. This is where tests will be run and temporary output files
|
|
placed.
|
|
|
|
**environment** A dictionary representing the environment to use when executing
|
|
tests in the suite.
|
|
|
|
**suffixes** For **lit** test formats which scan directories for tests, this
|
|
variable is a list of suffixes to identify test files. Used by: *ShTest*.
|
|
|
|
**substitutions** For **lit** test formats which substitute variables into a test
|
|
script, the list of substitutions to perform. Used by: *ShTest*.
|
|
|
|
**unsupported** Mark an unsupported directory, all tests within it will be
|
|
reported as unsupported. Used by: *ShTest*.
|
|
|
|
**parent** The parent configuration, this is the config object for the directory
|
|
containing the test suite, or None.
|
|
|
|
**root** The root configuration. This is the top-most :program:`lit` configuration in
|
|
the project.
|
|
|
|
**pipefail** Normally a test using a shell pipe fails if any of the commands
|
|
on the pipe fail. If this is not desired, setting this variable to false
|
|
makes the test fail only if the last command in the pipe fails.
|
|
|
|
TEST DISCOVERY
|
|
~~~~~~~~~~~~~~
|
|
|
|
Once test suites are located, :program:`lit` recursively traverses the source
|
|
directory (following *test_source_root*) looking for tests. When :program:`lit`
|
|
enters a sub-directory, it first checks to see if a nested test suite is
|
|
defined in that directory. If so, it loads that test suite recursively,
|
|
otherwise it instantiates a local test config for the directory (see
|
|
:ref:`local-configuration-files`).
|
|
|
|
Tests are identified by the test suite they are contained within, and the
|
|
relative path inside that suite. Note that the relative path may not refer to
|
|
an actual file on disk; some test formats (such as *GoogleTest*) define
|
|
"virtual tests" which have a path that contains both the path to the actual
|
|
test file and a subpath to identify the virtual test.
|
|
|
|
.. _local-configuration-files:
|
|
|
|
LOCAL CONFIGURATION FILES
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
When :program:`lit` loads a subdirectory in a test suite, it instantiates a
|
|
local test configuration by cloning the configuration for the parent directory
|
|
--- the root of this configuration chain will always be a test suite. Once the
|
|
test configuration is cloned :program:`lit` checks for a *lit.local.cfg* file
|
|
in the subdirectory. If present, this file will be loaded and can be used to
|
|
specialize the configuration for each individual directory. This facility can
|
|
be used to define subdirectories of optional tests, or to change other
|
|
configuration parameters --- for example, to change the test format, or the
|
|
suffixes which identify test files.
|
|
|
|
PRE-DEFINED SUBSTITUTIONS
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
:program:`lit` provides various patterns that can be used with the RUN command.
|
|
These are defined in TestRunner.py.
|
|
|
|
========== ==============
|
|
Macro Substitution
|
|
========== ==============
|
|
%s source path (path to the file currently being run)
|
|
%S source dir (directory of the file currently being run)
|
|
%p same as %S
|
|
%{pathsep} path separator
|
|
%t temporary file name unique to the test
|
|
%T temporary directory unique to the test
|
|
%% %
|
|
%/s same as %s but replace all / with \\
|
|
%/S same as %S but replace all / with \\
|
|
%/p same as %p but replace all / with \\
|
|
%/t same as %t but replace all / with \\
|
|
%/T same as %T but replace all / with \\
|
|
========== ==============
|
|
|
|
Further substitution patterns might be defined by each test module.
|
|
See the modules :ref:`local-configuration-files`.
|
|
|
|
More information on the testing infrastucture can be found in the
|
|
:doc:`../TestingGuide`.
|
|
|
|
TEST RUN OUTPUT FORMAT
|
|
~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
The :program:`lit` output for a test run conforms to the following schema, in
|
|
both short and verbose modes (although in short mode no PASS lines will be
|
|
shown). This schema has been chosen to be relatively easy to reliably parse by
|
|
a machine (for example in buildbot log scraping), and for other tools to
|
|
generate.
|
|
|
|
Each test result is expected to appear on a line that matches:
|
|
|
|
.. code-block:: none
|
|
|
|
<result code>: <test name> (<progress info>)
|
|
|
|
where ``<result-code>`` is a standard test result such as PASS, FAIL, XFAIL,
|
|
XPASS, UNRESOLVED, or UNSUPPORTED. The performance result codes of IMPROVED and
|
|
REGRESSED are also allowed.
|
|
|
|
The ``<test name>`` field can consist of an arbitrary string containing no
|
|
newline.
|
|
|
|
The ``<progress info>`` field can be used to report progress information such
|
|
as (1/300) or can be empty, but even when empty the parentheses are required.
|
|
|
|
Each test result may include additional (multiline) log information in the
|
|
following format:
|
|
|
|
.. code-block:: none
|
|
|
|
<log delineator> TEST '(<test name>)' <trailing delineator>
|
|
... log message ...
|
|
<log delineator>
|
|
|
|
where ``<test name>`` should be the name of a preceding reported test, ``<log
|
|
delineator>`` is a string of "*" characters *at least* four characters long
|
|
(the recommended length is 20), and ``<trailing delineator>`` is an arbitrary
|
|
(unparsed) string.
|
|
|
|
The following is an example of a test run output which consists of four tests A,
|
|
B, C, and D, and a log message for the failing test C:
|
|
|
|
.. code-block:: none
|
|
|
|
PASS: A (1 of 4)
|
|
PASS: B (2 of 4)
|
|
FAIL: C (3 of 4)
|
|
******************** TEST 'C' FAILED ********************
|
|
Test 'C' failed as a result of exit code 1.
|
|
********************
|
|
PASS: D (4 of 4)
|
|
|
|
LIT EXAMPLE TESTS
|
|
~~~~~~~~~~~~~~~~~
|
|
|
|
The :program:`lit` distribution contains several example implementations of
|
|
test suites in the *ExampleTests* directory.
|
|
|
|
SEE ALSO
|
|
--------
|
|
|
|
valgrind(1)
|