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add documentation of register_assert_rewrite 

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Harry Percival 2018-09-25 06:49:50 +01:00 committed by GitHub
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@ -264,8 +264,12 @@ Advanced assertion introspection
Reporting details about a failing assertion is achieved by rewriting assert Reporting details about a failing assertion is achieved by rewriting assert
statements before they are run. Rewritten assert statements put introspection statements before they are run. Rewritten assert statements put introspection
information into the assertion failure message. ``pytest`` only rewrites test information into the assertion failure message. ``pytest`` only rewrites test
modules directly discovered by its test collection process, so asserts in modules directly discovered by its test collection process, so **asserts in
supporting modules which are not themselves test modules will not be rewritten. supporting modules which are not themselves test modules will not be rewritten**.
You can manually enable assertion rewriting for an imported module by calling
`register_assert_rewrite<https://docs.pytest.org/en/latest/writing_plugins.html#assertion-rewriting>`
before you import it.
.. note:: .. note::