def test_every(self):
    c = Collection([1, 2, 3, 4, 5, 6])
    self.assertEqual([1, 3, 5], c.every(2).all())
    self.assertEqual([2, 4, 6], c.every(2, 1).all())
def test_every(self):
    c = Collection([1, 2, 3, 4, 5, 6])
    self.assertEqual([1, 3, 5], c.every(2).all())
    self.assertEqual([2, 4, 6], c.every(2, 1).all())