def test_resumeFromResumeOffset(self):
    """
    If given a resumeOffset argument, L{DccFileReceive} will attempt to
    resume from that number of bytes if the file exists.
    """
    fp = FilePath(self.mktemp())
    fp.setContent("Twisted is awesome!")
    protocol = self.makeConnectedDccFileReceive(fp.path, resumeOffset=11)

    self.allDataReceivedForProtocol(protocol, "amazing!")

    self.assertEqual("Twisted is amazing!", fp.getContent())