def METHOD_NAME(self):
    unit = MockUnit(source="Foo\x1b")
    fix = RemoveControlChars()
    self.assertEqual(fix.fix_target(["Bar"], unit), (["Bar"], False))
    self.assertEqual(fix.fix_target(["Bar\x1b"], unit), (["Bar"], True))
    self.assertEqual(fix.fix_target(["Bar\n"], unit), (["Bar\n"], False))