Function test_cache_error

testing/test_stepwise.py:515–545

(pytester: Pytester)

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

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

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