def test_foldl_order(self):
"""Test that left folds are applied in the correct order.
E.g., foldl(pow, 2, [1, 2, 3]) should be applied like:
(2^1) = 2
(2^2) = 4
(4^3) = 64
"""
self.assertEqual(foldl(pow, 2, [1, 2, 3]), 64)
def test_foldl_basic(self):
""" Test that left folds basically work. """
self.assertEqual(foldl(add, 2, [1, 2, 3]), 8)