| # Copyright 2019 Google LLC |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # https://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Tests for simple_memoizer.""" |
| |
| import unittest |
| from util import simple_memoizer |
| |
| |
| class SimpleMemoizerTest(unittest.TestCase): |
| |
| def test_memoized_function_returns_same_values(self): |
| @simple_memoizer.memoize |
| def add_one(n): |
| return n + 1 |
| |
| for i in range(100): |
| self.assertEqual(i + 1, add_one(i)) |
| |
| def test_memoized_function_is_only_called_once(self): |
| arguments = [] |
| |
| @simple_memoizer.memoize |
| def add_one_and_add_argument_to_list(n): |
| arguments.append(n) |
| return n + 1 |
| |
| self.assertEqual(1, add_one_and_add_argument_to_list(0)) |
| self.assertEqual([0], arguments) |
| self.assertEqual(1, add_one_and_add_argument_to_list(0)) |
| self.assertEqual([0], arguments) |
| |
| def test_memoized_function_with_multiple_arguments(self): |
| arguments = [] |
| |
| @simple_memoizer.memoize |
| def sum_arguments_and_add_arguments_to_list(n, m, o): |
| arguments.append((n, m, o)) |
| return n + m + o |
| |
| self.assertEqual(3, sum_arguments_and_add_arguments_to_list(0, 1, 2)) |
| self.assertEqual([(0, 1, 2)], arguments) |
| self.assertEqual(3, sum_arguments_and_add_arguments_to_list(0, 1, 2)) |
| self.assertEqual([(0, 1, 2)], arguments) |
| self.assertEqual(3, sum_arguments_and_add_arguments_to_list(2, 1, 0)) |
| self.assertEqual([(0, 1, 2), (2, 1, 0)], arguments) |
| |
| def test_memoized_function_with_no_arguments(self): |
| arguments = [] |
| |
| @simple_memoizer.memoize |
| def return_one_and_add_empty_tuple_to_list(): |
| arguments.append(()) |
| return 1 |
| |
| self.assertEqual(1, return_one_and_add_empty_tuple_to_list()) |
| self.assertEqual([()], arguments) |
| self.assertEqual(1, return_one_and_add_empty_tuple_to_list()) |
| self.assertEqual([()], arguments) |
| |
| if __name__ == '__main__': |
| unittest.main() |