'The string representation of a L{FlagConstant} instance which results
from C{^} includes the names of only the flags which were set in
exactly one of the two original constants.'

def test_representation(self):

    readWrite = (self.FXF.READ | self.FXF.WRITE)
    writeAppend = (self.FXF.WRITE | self.FXF.APPEND)
    flag = (readWrite ^ writeAppend)
    self.assertEqual('<FXF={APPEND,READ}>', repr(flag))
