def testProtein(self):
        self.assertEqual(self.mMasker(
            "ACDEFGHIKLWWWWWWWWWWWWWWwwwwwwwwwwwacdefghikl"),
            "ACDEFGHIKLXXXXXXXXXXXXXXxxxxxxxxxxxacdefghikl")
test protein input.
dataset/ETHPy150Open CGATOxford/cgat/tests/Masker_test.py/SegCheck.testProtein