Assertion rewriting does not work in packages.

[pytestbot]

Originally reported by: Michał Bartoszkiewicz (BitBucket: embe, GitHub: embe)

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Assertion rewriting seems inactive in modules that reside in a package.

pkg/test_foo.py, containing:

#!python
from StringIO import StringIO
def test_foo():
    s = StringIO('foo')
    assert s.read() == ''

fails with "AssertionError: (assertion failed, but when it was re-run for printing intermediate values, it did not fail. Suggestions: compute assert expression before the assert or use --assert=plain)" when pkg/init.py exists, but with "assert 'foo' == ''" when it is deleted.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/68

[pytestbot]

Original comment by Benjamin Peterson (BitBucket: gutworth, GitHub: gutworth):

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only use the last part of the module name in the filename (fixes #68)