bcbd0c8fe1
Fix review comments that were missed at the time. Also explain why we need
to regenerate the device tree for each test.
Reported-by: Teddy Reed <teddy.reed@gmail.com>
Suggested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: f6349c3c (test: Add a README)
93 lines
2.9 KiB
Plaintext
93 lines
2.9 KiB
Plaintext
Testing in U-Boot
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=================
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U-Boot has a large amount of code. This file describes how this code is
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tested and what tests you should write when adding a new feature.
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Running tests
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-------------
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To run most tests on sandbox, type this:
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test/run
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in the U-Boot directory. Note that only the pytest suite is run using this
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command.
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Sandbox
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-------
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U-Boot can be built as a user-space application (e.g. for Linux). This
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allows test to be executed without needing target hardware. The 'sandbox'
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target provides this feature and it is widely used in tests.
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Pytest Suite
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------------
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Many tests are available using the pytest suite, in test/py. This can run
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either on sandbox or on real hardware. It relies on the U-Boot console to
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inject test commands and check the result. It is slower to run than C code,
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but provides the ability to unify lots of tests and summarise their results.
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You can run the tests on sandbox with:
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./test/py/test.py --bd sandbox --build
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This will produce HTML output in build-sandbox/test-log.html
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See test/py/README.md for more information about the pytest suite.
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tbot
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----
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Tbot provides a way to execute tests on target hardware. It is intended for
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trying out both U-Boot and Linux (and potentially other software) on a
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number of boards automatically. It can be used to create a continuous test
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environment. See tools/tbot/README for more information.
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Ad-hoc tests
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------------
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There are several ad-hoc tests which run outside the pytest environment:
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test/fs - File system test (shell script)
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test/image - FIT and legacy image tests (shell script and Python)
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test/stdint - A test that stdint.h can be used in U-Boot (shell script)
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trace - Test for the tracing feature (shell script)
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TODO: Move these into pytest.
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When to write tests
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-------------------
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If you add code to U-Boot without a test you are taking a risk. Even if you
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perform thorough manual testing at the time of submission, it may break when
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future changes are made to U-Boot. It may even break when applied to mainline,
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if other changes interact with it. A good mindset is that untested code
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probably doesn't work and should be deleted.
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You can assume that the Pytest suite will be run before patches are accepted
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to mainline, so this provides protection against future breakage.
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On the other hand there is quite a bit of code that is not covered with tests,
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or is covered sparingly. So here are some suggestions:
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- If you are adding a new uclass, add a sandbox driver and a test that uses it
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- If you are modifying code covered by an existing test, add a new test case
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to cover your changes
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- If the code you are modifying has not tests, consider writing one. Even a
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very basic test is useful, and may be picked up and enhanced by others. It
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is much easier to add onto a test - writing a new large test can seem
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daunting to most contributors.
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Future work
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-----------
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Converting existing shell scripts into pytest tests.
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