def _testHeaderSignature(data, reporter):
    header = unpackHeader(data)
    signature = header["signature"]
    if signature != "wOFF":
        reporter.logError(message="Invalid signature: %s." % signature)
        return True
    else:
        reporter.logPass(message="The signature is correct.")
Insure that DiscoveryError is raised when a test which imports a
dataset/ETHPy150Open typesupply/woffTools/Lib/woffTools/tools/validate.py/_testHeaderSignature--crossover with--dataset/ETHPy150Open Yelp/Testify/test/discovery_failure_test.py/DiscoveryFailureTestCase.test_discover_test_with_broken_import