def test_get_index_respects_keyboard_order():
keyboard = Keyboard(reversed(C_MAJOR_SINGLE))
assert keyboard.get_index(60) == 7
assert keyboard.get_index(62) == 6
assert keyboard.get_index(71) == 1
assert keyboard.get_index(72) == 0
def test_calculate_transposition_is_independent_on_keyboard_order():
keyboard = Keyboard(reversed(C_MAJOR_SINGLE))
assert keyboard.calculate_transposition({57, 58}) == 7
assert keyboard.calculate_transposition({64, 65}) == 0
assert keyboard.calculate_transposition({72, 73}) == -1
assert keyboard.calculate_transposition({75, 76}) == -4
def test_get_index():
keyboard = Keyboard(C_MAJOR_SINGLE)
assert keyboard.get_index(60) == 0
assert keyboard.get_index(62) == 1
assert keyboard.get_index(71) == 6
assert keyboard.get_index(72) == 7
with pytest.raises(KeyError):
keyboard.get_index(59)
with pytest.raises(KeyError):
keyboard.get_index(61)
def test_calculate_transposition_throws_exception_if_impossible():
keyboard = Keyboard(C_MAJOR_SINGLE)
with pytest.raises(RuntimeError):
keyboard.calculate_transposition({60, 61, 62})
with pytest.raises(RuntimeError):
keyboard.calculate_transposition({60, 74})
def test_calculate_transposition_finds_nearest_match():
keyboard = Keyboard(C_MAJOR_SINGLE)
assert keyboard.calculate_transposition({57, 58}) == 7
assert keyboard.calculate_transposition({58, 59}) == 6
assert keyboard.calculate_transposition({59, 60}) == 5
assert keyboard.calculate_transposition({60, 61}) == 4
assert keyboard.calculate_transposition({61, 62}) == 3
assert keyboard.calculate_transposition({62, 63}) == 2
assert keyboard.calculate_transposition({63, 64}) == 1
assert keyboard.calculate_transposition({64, 65}) == 0
assert keyboard.calculate_transposition({65, 66}) == -1
assert keyboard.calculate_transposition({66, 67}) == -2
assert keyboard.calculate_transposition({67, 68}) == -3
assert keyboard.calculate_transposition({68, 69}) == 3
assert keyboard.calculate_transposition({69, 70}) == 2
assert keyboard.calculate_transposition({70, 71}) == 1
assert keyboard.calculate_transposition({71, 72}) == 0
assert keyboard.calculate_transposition({72, 73}) == -1
assert keyboard.calculate_transposition({73, 74}) == -2
assert keyboard.calculate_transposition({74, 75}) == -3
assert keyboard.calculate_transposition({75, 76}) == -4