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# 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, 0.4) def test_uncached_time(self): self.assertLess(SetupNoCachePerformanceTest.elapsed_time, 6) 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()