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helper_test.py
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executable file
·69 lines (59 loc) · 1.96 KB
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2019 Brett Slatkin, Pearson Education Inc.
#
# 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
#
# http://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.
from unittest import TestCase, main
def sum_squares(values):
cumulative = 0
for value in values:
cumulative += value ** 2
yield cumulative
class HelperTestCase(TestCase):
def verify_complex_case(self, values, expected):
expect_it = iter(expected)
found_it = iter(sum_squares(values))
test_it = zip(expect_it, found_it)
for i, (expect, found) in enumerate(test_it):
self.assertEqual(
expect,
found,
f'Index {i} is wrong')
# Verify both generators are exhausted
try:
next(expect_it)
except StopIteration:
pass
else:
self.fail('Expected longer than found')
try:
next(found_it)
except StopIteration:
pass
else:
self.fail('Found longer than expected')
def test_wrong_lengths(self):
values = [1.1, 2.2, 3.3]
expected = [
1.1**2,
]
self.verify_complex_case(values, expected)
def test_wrong_results(self):
values = [1.1, 2.2, 3.3]
expected = [
1.1**2,
1.1**2 + 2.2**2,
1.1**2 + 2.2**2 + 3.3**2 + 4.4**2,
]
self.verify_complex_case(values, expected)
if __name__ == '__main__':
main()