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# 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()