def test_multiple_comparison(self): self.assertEqual(most_frequent([0,9,1,8,8,2,7,3,6,4,8,5,1,1,0,9,9]), 1)
def test_single_ElementMixin(self): self.assertEqual(most_frequent([5]), 5)
def test_multiple(self): self.assertEqual(most_frequent([0,9,1,8,8,2,7,3,6,4,5]), 8)
def test_empty(self): self.assertEqual(most_frequent([]), None)