def test_random_fixtures_with_seed(): """Check random fixture values will be the same when random seed is explicitly provided through a custom pytest option. """ result_first = subprocess.run( [*pytest_command, "--swh-web-random-seed=2021", "random_fixtures_test.py"], capture_output=True, cwd=os.path.dirname(__file__), ) result_second = subprocess.run( [*pytest_command, "--swh-web-random-seed=2021", "random_fixtures_test.py"], capture_output=True, cwd=os.path.dirname(__file__), ) assert result_first.stderr == result_second.stderr > assert b'Use "pytest --swh-web-random-seed=2021' in result_first.stdout E assert b'Use "pytest --swh-web-random-seed=2021' in b'============================= test session starts ==============================\nplatform linux -- Python 3.7.3, py...ture_values - IndexError: Canno...\n======================== 13 warnings, 1 error in 3.11s =========================\n' E + where b'============================= test session starts ==============================\nplatform linux -- Python 3.7.3, py...ture_values - IndexError: Canno...\n======================== 13 warnings, 1 error in 3.11s =========================\n' = CompletedProcess(args=['python3', '-m', 'pytest', '-s', '--swh-web-random-seed=2021', 'random_fixtures_test.py'], retu... IndexError: Canno...\n======================== 13 warnings, 1 error in 3.11s =========================\n', stderr=b'').stdout .tox/py3/lib/python3.7/site-packages/swh/web/tests/test_random_fixtures.py:45: AssertionError