1*99e0aae7SDavid Rees# Copyright 2019 Google LLC 2*99e0aae7SDavid Rees# 3*99e0aae7SDavid Rees# Licensed under the Apache License, Version 2.0 (the "License"); 4*99e0aae7SDavid Rees# you may not use this file except in compliance with the License. 5*99e0aae7SDavid Rees# You may obtain a copy of the License at 6*99e0aae7SDavid Rees# 7*99e0aae7SDavid Rees# https://www.apache.org/licenses/LICENSE-2.0 8*99e0aae7SDavid Rees# 9*99e0aae7SDavid Rees# Unless required by applicable law or agreed to in writing, software 10*99e0aae7SDavid Rees# distributed under the License is distributed on an "AS IS" BASIS, 11*99e0aae7SDavid Rees# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*99e0aae7SDavid Rees# See the License for the specific language governing permissions and 13*99e0aae7SDavid Rees# limitations under the License. 14*99e0aae7SDavid Rees 15*99e0aae7SDavid Rees"""Tests for simple_memoizer.""" 16*99e0aae7SDavid Rees 17*99e0aae7SDavid Reesimport unittest 18*99e0aae7SDavid Reesfrom compiler.util import simple_memoizer 19*99e0aae7SDavid Rees 20*99e0aae7SDavid Rees 21*99e0aae7SDavid Reesclass SimpleMemoizerTest(unittest.TestCase): 22*99e0aae7SDavid Rees 23*99e0aae7SDavid Rees def test_memoized_function_returns_same_values(self): 24*99e0aae7SDavid Rees @simple_memoizer.memoize 25*99e0aae7SDavid Rees def add_one(n): 26*99e0aae7SDavid Rees return n + 1 27*99e0aae7SDavid Rees 28*99e0aae7SDavid Rees for i in range(100): 29*99e0aae7SDavid Rees self.assertEqual(i + 1, add_one(i)) 30*99e0aae7SDavid Rees 31*99e0aae7SDavid Rees def test_memoized_function_is_only_called_once(self): 32*99e0aae7SDavid Rees arguments = [] 33*99e0aae7SDavid Rees 34*99e0aae7SDavid Rees @simple_memoizer.memoize 35*99e0aae7SDavid Rees def add_one_and_add_argument_to_list(n): 36*99e0aae7SDavid Rees arguments.append(n) 37*99e0aae7SDavid Rees return n + 1 38*99e0aae7SDavid Rees 39*99e0aae7SDavid Rees self.assertEqual(1, add_one_and_add_argument_to_list(0)) 40*99e0aae7SDavid Rees self.assertEqual([0], arguments) 41*99e0aae7SDavid Rees self.assertEqual(1, add_one_and_add_argument_to_list(0)) 42*99e0aae7SDavid Rees self.assertEqual([0], arguments) 43*99e0aae7SDavid Rees 44*99e0aae7SDavid Rees def test_memoized_function_with_multiple_arguments(self): 45*99e0aae7SDavid Rees arguments = [] 46*99e0aae7SDavid Rees 47*99e0aae7SDavid Rees @simple_memoizer.memoize 48*99e0aae7SDavid Rees def sum_arguments_and_add_arguments_to_list(n, m, o): 49*99e0aae7SDavid Rees arguments.append((n, m, o)) 50*99e0aae7SDavid Rees return n + m + o 51*99e0aae7SDavid Rees 52*99e0aae7SDavid Rees self.assertEqual(3, sum_arguments_and_add_arguments_to_list(0, 1, 2)) 53*99e0aae7SDavid Rees self.assertEqual([(0, 1, 2)], arguments) 54*99e0aae7SDavid Rees self.assertEqual(3, sum_arguments_and_add_arguments_to_list(0, 1, 2)) 55*99e0aae7SDavid Rees self.assertEqual([(0, 1, 2)], arguments) 56*99e0aae7SDavid Rees self.assertEqual(3, sum_arguments_and_add_arguments_to_list(2, 1, 0)) 57*99e0aae7SDavid Rees self.assertEqual([(0, 1, 2), (2, 1, 0)], arguments) 58*99e0aae7SDavid Rees 59*99e0aae7SDavid Rees def test_memoized_function_with_no_arguments(self): 60*99e0aae7SDavid Rees arguments = [] 61*99e0aae7SDavid Rees 62*99e0aae7SDavid Rees @simple_memoizer.memoize 63*99e0aae7SDavid Rees def return_one_and_add_empty_tuple_to_list(): 64*99e0aae7SDavid Rees arguments.append(()) 65*99e0aae7SDavid Rees return 1 66*99e0aae7SDavid Rees 67*99e0aae7SDavid Rees self.assertEqual(1, return_one_and_add_empty_tuple_to_list()) 68*99e0aae7SDavid Rees self.assertEqual([()], arguments) 69*99e0aae7SDavid Rees self.assertEqual(1, return_one_and_add_empty_tuple_to_list()) 70*99e0aae7SDavid Rees self.assertEqual([()], arguments) 71*99e0aae7SDavid Rees 72*99e0aae7SDavid Reesif __name__ == '__main__': 73*99e0aae7SDavid Rees unittest.main() 74