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Per-implementation tests are tests that are defined once and then run
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against multiple implementations of an interface. For example,
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``test_transport_implementations.py`` defines tests that all Transport
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implementations (local filesystem, HTTP, and so on) must pass.
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They are found in ``bzrlib/tests/*_implementations/test_*.py``,
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``bzrlib/tests/per_*/*.py``, and
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``bzrlib/tests/test_*_implementations.py``.
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``per_transport.py`` defines tests that all Transport implementations
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(local filesystem, HTTP, and so on) must pass. They are found in
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``bzrlib/tests/per_*/*.py``, and ``bzrlib/tests/per_*.py``.
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These are really a sub-category of unit tests, but an important one.
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Along the same lines are tests for extension modules. We generally have
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both a pure-python and a compiled implementation for each module. As such,
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we want to run the same tests against both implementations. These can
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generally be found in ``bzrlib/tests/*__*.py`` since extension modules are
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usually prefixed with an underscore. Since there are only two
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implementations, we have a helper function
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``bzrlib.tests.permute_for_extension``, which can simplify the
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``load_tests`` implementation.
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KnownFailure should be used with care as we don't want a
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proliferation of quietly broken tests.
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ModuleAvailableFeature
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A helper for handling running tests based on whether a python
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module is available. This can handle 3rd-party dependencies (is
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``paramiko`` available?) as well as stdlib (``termios``) or
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extension modules (``bzrlib._groupcompress_pyx``). You create a
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new feature instance with::
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MyModuleFeature = ModuleAvailableFeature('bzrlib.something')
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def test_something(self):
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self.requireFeature(MyModuleFeature)
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something = MyModuleFeature.module
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We plan to support three modes for running the test suite to control the
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interpretation of these results. Strict mode is for use in situations
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like merges to the mainline and releases where we want to make sure that