def test_flatten_should_neutralize_sharp(self):
expected_semitone = Semitone('D')
instance = Semitone('D',sharps=1)
result = instance.flatten()
self.assertSame(result,expected_semitone)
def test_flatten_should_flatten_flat(self):
expected_semitone = Semitone('D',flats=2)
instance = Semitone('D',flats=1)
result = instance.flatten()
self.assertSame(result,expected_semitone)
def test_sub_with_flattened_semitone(self):
instance = Semitone('D')
expected_result = 1
result = instance - instance.flatten()
self.assertEquals(result, expected_result)