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"""
pytest local configuration plug-in
"""
import gc
import warnings
import pytest
@pytest.yield_fixture(scope='function', autouse=True)
def fail_on_ResourceWarning():
"""This fixture captures ResourceWarning's and raises an assertion error
describing the file handles left open.
Since only Python 3 and PyPy3 have ResourceWarning's, this context will
have no effect when running tests on Python 2 or PyPy.
Because of autouse=True, this function will be automatically enabled for
all test_* functions in this module.
This code is primarily based on the examples found here:
https://stackoverflow.com/questions/24717027/convert-python-3-resourcewarnings-into-exception
"""
try:
ResourceWarning
except NameError:
# Python 2, PyPy
yield
return
# Python 3, PyPy3
with warnings.catch_warnings(record=True) as caught:
warnings.resetwarnings() # clear all filters
warnings.simplefilter('ignore') # ignore all
warnings.simplefilter('always', ResourceWarning) # add filter
yield # run tests in this context
gc.collect() # run garbage collection (for pypy3)
# display the problematic filenames if any warnings were caught
assert not caught, '\n'.join((str(warning.message) for warning in caught))
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