Function test_cache_error

testing/test_stepwise.py:515–545

(pytester: Pytester)

def test_cache_error(pytester: Pytester) -> None:
    pytester.makepyfile(
        """
        def test_1(): pass
        """
    )
    # Run stepwise normally to generate the cache information.
    result = pytester.runpytest("--stepwise", "-v")
    result.stdout.fnmatch_lines(
        [
            "stepwise: no previously failed tests, not skipping.",
            "*::test_1 *PASSED*",
            "* 1 passed in *",
        ]
    )

    # Corrupt the cache.
    cache_file = pytester.path / f".pytest_cache/v/{STEPWISE_CACHE_DIR}"
    assert cache_file.is_file()
    cache_file.write_text(json.dumps({"invalid": True}), encoding="UTF-8")

    # Check we run as if the cache did not exist, but also show an error message.
    result = pytester.runpytest("--stepwise", "-v")
    result.stdout.fnmatch_lines(
        [
            "stepwise: error reading cache, discarding (KeyError: *",
            "stepwise: no previously failed tests, not skipping.",
            "*::test_1 *PASSED*",
            "* 1 passed in *",
        ]
    )