'Wrap L{verifyConstructorArgument} to provide simpler interface for
testing  _EDNSMessage constructor flags.
@param argName: The name of the constructor flag argument
@param defaultVal: The expected default value of the flag'

def _verifyConstructorFlag(self, argName, defaultVal):

    assert (defaultVal in (True, False))
    verifyConstructorArgument(testCase=self, cls=self.messageFactory, argName=argName, defaultVal=defaultVal, altVal=(not defaultVal))
