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import pytest
@pytest.fixture(scope='function')
def environ(request, monkeypatch):
"""
Fixture to define environment variables before Sphinx App is created.
The test case needs to be marked as
``@pytest.mark.environ(VARIABLE='value')`` with all the environment
variables wanted to define. Also, the test has to use this fixture before
the ``app`` once to have effect.
This idea is borrowed from,
https://github.com/sphinx-doc/sphinx/blob/3f6565df6323534e69d797003d8cb20e99c2c255/sphinx/testing/fixtures.py#L30
"""
if hasattr(request.node, 'iter_markers'): # pytest-3.6.0 or newer
markers = request.node.iter_markers('environ')
else:
markers = request.node.get_marker('environ')
pargs = {}
kwargs = {}
if markers is not None:
# to avoid stacking positional args
for info in reversed(list(markers)):
for i, a in enumerate(info.args):
pargs[i] = a
kwargs.update(info.kwargs)
for name, value in kwargs.items():
monkeypatch.setenv(name, value)
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