Define pytest fixtures as context managers.
pytest-contextfixture makes it possible to define pytest fixtures as context managers.
A contextfixture works like a standard fixture, but it allows the definition to be written as a generator. This simplifies the teardown code and allows for other context managers to be used within a fixture.
pip install pytest-contextfixture
Consider this example, using the standard pytest.fixture:
import pytest @pytest.fixture def dependency(request) def teardown(): # fixture teardown code goes here request.addfinalizer(teardown) return 1234 def test_foo(dependency): assert fn_under_test(dependency) == 'expected'
With pytest.contextfixture, this is equivalent:
import pytest @pytest.contextfixture def dependency(request): # fixture setup code goes here yield 1234 # fixture teardown code goes here def test_foo(dependency): assert fn_under_test(dependency) == 'expected'
While this is a slightly nicer syntax, when using other context managers to get a dependency for a fixture, this becomes more useful:
@pytest_contextfixture def dependency(request): with setup_something(): with setup_something_else() as d: yield d def test_foo(dependency): assert fn_under_test(dependency) == 'expected'
test_foo will then run in the context of setup_something and setup_something_else.
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