def test_count_below_mean(self):
        self.assertEqualOnAllArrayTypes(count_below_mean, [1, 2, 1, 2, 1, 2], 3)
        self.assertEqualOnAllArrayTypes(count_below_mean, [1, 1, 1, 1, 1, 2], 5)
        self.assertEqualOnAllArrayTypes(count_below_mean, [1, 1, 1, 1, 1], 0)
        self.assertEqualOnAllArrayTypes(count_below_mean, [], 0)