'The value of the L{FlagConstant} which results from C{^} has all of the
bits set which were set in exactly one of the values of the two
original constants.'

def test_value(self):

    readWrite = (self.FXF.READ | self.FXF.WRITE)
    writeAppend = (self.FXF.WRITE | self.FXF.APPEND)
    flag = (readWrite ^ writeAppend)
    self.assertEqual((self.FXF.READ.value | self.FXF.APPEND.value), flag.value)
