def test_filter_even_numbers_only_odd(self):
data = [1, 15, 27, -3, -5]
result = exercises.filter_even_numbers(data)
self.assertIsNone(None, result)
self.assertListEqual([], data) # original data modified
def test_filter_even_numbers_with_mixed(self):
data = [1, 3, 3, 0, 4, 5, 17, 22, 209, 100, -2, -7, -90]
result = exercises.filter_even_numbers(data)
self.assertIsNone(None, result)
self.assertListEqual([0, 4, 22, 100, -2, -90],
data) # original data modified