warnings.py 文件源码

def assert_warnings(fn, warning_msgs, regex=False):
    """Assert that each of the given warnings are emitted by fn."""

    from .assertions import eq_

    with warnings.catch_warnings(record=True) as log:
        # ensure that nothing is going into __warningregistry__
        warnings.filterwarnings("always")

        result = fn()
    for warning in log:
        popwarn = warning_msgs.pop(0)
        if regex:
            assert re.match(popwarn, str(warning.message))
        else:
            eq_(popwarn, str(warning.message))
    return result