def test_mode_returns_none(self):
emptyList = []
stat = Statistics(emptyList)
actual = stat.mode()
expected = None
self.assertEqual(expected, actual)
def test_mode_return_2(self):
statlist = [2, 4, 2, 6, 2, 7, 8, 2, 7, 3, 20, 3]
stat = Statistics(statlist)
actual = stat.mode()
expected = 2
self.assertEqual(expected, actual)
