def test_init_type(self):
"""
Try creating chords with a particular type and check (a) that they
successfully create a chord and (b) that the chord has the right type.
"""
for ctype in Chord.TYPE_SYMBOLS.values():
c = Chord("C", type=ctype)
self.assertEqual(c.type, ctype)
def test_interval(self):
"""
Try getting the interval between two chords and check it comes out
as expected.
"""
# Some randomly chosen tests
tests = [(0, "C", "C", True), (2, "F", "G", False),
(4, "D", "F#", False), (6, "B", "F", True),
(8, "F", "Db", False), (10, "Ab", "F#", False)]
for interval, lower, upper, invertible in tests:
c0 = Chord(lower)
c1 = Chord(upper)
self.assertEqual(interval, Chord.interval(c0, c1))
# Try inverting the interval and check it's only the same in the
# cases where the interval is its own inverse
if invertible:
self.assertEqual(interval, Chord.interval(c1, c0))
else:
self.assertNotEqual(interval, Chord.interval(c1, c0))
def test_from_numerals(self):
"""
Try creating chords using all possbile numerals and check the numeral
and root get set correctly.
"""
for numeral, root, trg_num in self.ALLOWED_NUMERALS:
# Try creating a Chord with each numeral
c = Chord(numeral)
# Check it has the right numeral
self.assertEqual(trg_num, c.root_numeral)
# and the right root number
self.assertEqual(root, c.root)
def test_set_root(self):
"""
Try setting the root or numeral after a chord is created and check
that both values get correctly set.
"""
c = Chord(self.ALLOWED_NUMERALS[0][0])
for numeral, root, trg_num in self.ALLOWED_NUMERALS:
# Try setting the root and check root and numeral are correct
c.root = root
self.assertEqual(root, c.root)
self.assertEqual(trg_num, c.root_numeral)
for numeral, root, trg_num in self.ALLOWED_NUMERALS:
# Try setting the numeral and check root and numeral are correct
c.root_numeral = numeral
self.assertEqual(root, c.root)
self.assertEqual(trg_num, c.root_numeral)
