Function test_log_file_mode_cli

testing/logging/test_reporting.py:667–704

(pytester: Pytester)

def test_log_file_mode_cli(pytester: Pytester) -> None:
    # Default log file level
    pytester.makepyfile(
        """
        import pytest
        import logging
        def test_log_file(request):
            plugin = request.config.pluginmanager.getplugin('logging-plugin')
            assert plugin.log_file_handler.level == logging.WARNING
            logging.getLogger('catchlog').info("This log message won't be shown")
            logging.getLogger('catchlog').warning("This log message will be shown")
            print('PASSED')
    """
    )

    log_file = str(pytester.path.joinpath("pytest.log"))

    with open(log_file, mode="w", encoding="utf-8") as wfh:
        wfh.write("A custom header\n")

    result = pytester.runpytest(
        "-s",
        f"--log-file={log_file}",
        "--log-file-mode=a",
        "--log-file-level=WARNING",
    )

    # fnmatch_lines does an assertion internally
    result.stdout.fnmatch_lines(["test_log_file_mode_cli.py PASSED"])

    # make sure that we get a '0' exit code for the testsuite
    assert result.ret == 0
    assert os.path.isfile(log_file)
    with open(log_file, encoding="utf-8") as rfh:
        contents = rfh.read()
        assert "A custom header" in contents
        assert "This log message will be shown" in contents
        assert "This log message won't be shown" not in contents


def test_log_file_mode_cli_invalid(pytester: Pytester) -> None: