# 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.
"""Shall provide tests to check performance overhead of pyfakefs."""
import os
import time
import unittest
from pyfakefs.fake_filesystem_unittest import TestCase
from pyfakefs.helpers import IS_PYPY
if os.environ.get("TEST_PERFORMANCE"):
class SetupPerformanceTest(TestCase):
@classmethod
def setUpClass(cls) -> None:
cls.start_time = time.time()
@classmethod
def tearDownClass(cls) -> None:
cls.elapsed_time = time.time() - cls.start_time
print(
"Elapsed time per test for cached setup: {:.3f} ms".format(
cls.elapsed_time * 10
)
)
def setUp(self) -> None:
self.setUpPyfakefs()
class SetupNoCachePerformanceTest(TestCase):
@classmethod
def setUpClass(cls) -> None:
cls.start_time = time.time()
@classmethod
def tearDownClass(cls) -> None:
cls.elapsed_time = time.time() - cls.start_time
print(
"Elapsed time per test for uncached setup: {:.3f} ms".format(
cls.elapsed_time * 10
)
)
def setUp(self) -> None:
self.setUpPyfakefs(use_cache=False)
@unittest.skipIf(IS_PYPY, "PyPy times are not comparable")
class TimePerformanceTest(TestCase):
"""Make sure performance degradation in setup is noticed.
The numbers are related to the CI builds and may fail in local builds.
"""
def test_cached_time(self):
self.assertLess(SetupPerformanceTest.elapsed_time, 0.18)
def test_uncached_time(self):
self.assertLess(SetupNoCachePerformanceTest.elapsed_time, 4)
def test_setup(self):
pass
for n in range(100):
test_name = "test_" + str(n)
setattr(SetupPerformanceTest, test_name, test_setup)
test_name = "test_nocache" + str(n)
setattr(SetupNoCachePerformanceTest, test_name, test_setup)
if __name__ == "__main__":
unittest.main()
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