def test_problematic_add_using_patch(self, mocker):
"""This test patches, i.e. replaces, the problematic code so
the tests can be carried out.
"""
# 'mocker' fixture can be used by taking it as an argument, see
# https://github.com/pytest-dev/pytest-mock/
mocker.patch("problematic.InfiniteLoopLibrary")
# problematic.InfiniteLoopLibrary class is now replaced
# with a mock.MagicMock object when it is instantiated by
# problematic.Problematic, see
# http://www.voidspace.org.uk/python/mock/patch.html#patch
p = Problematic()
assert p.add_using_external_dependency(1, 1) == 2
def test_problematic_add(self):
""""This test would block the test suite and serves as an
example of the problem. The test is skipped.
"""
p = Problematic()
assert p.add_using_external_dependency(1, 1) == 2