Ran Benita 24dcc76495 Use a hack to make typing of pytest.fail.Exception & co work ...

Mypy currently is unable to handle assigning attributes on function:
https://github.com/python/mypy/issues/2087.
pytest uses this for the outcome exceptions -- `pytest.fail.Exception`,
`pytest.exit.Exception` etc, and this is the canonical name by which they
are referred.

Initially we started working around this with type: ignores, and later
by switching e.g. `pytest.fail.Exception` with the direct exception
`Failed`. But this causes a lot of churn and is not as nice. And I also
found that some code relies on it, in skipping.py:

    def pytest_configure(config):
        if config.option.runxfail:
            # yay a hack
            import pytest

            old = pytest.xfail
            config._cleanup.append(lambda: setattr(pytest, "xfail", old))

            def nop(*args, **kwargs):
                pass

            nop.Exception = xfail.Exception
            setattr(pytest, "xfail", nop)
        ...

So it seems better to support it. Use a hack to make it work. The rest
of the commit rolls back all of the workarounds we added up to now.

`pytest.raises.Exception` also exists, but it's not used much so I kept
it as-is for now.

Hopefully in the future mypy supports this and this ugliness can be
removed.

2020-02-18 23:17:27 +02:00

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