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For the Python Tenacity library, mock the retry decorator for faster tests that don't actually wait
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| from tenacity import retry, stop_after_attempt, wait_exponential | |
| @retry(reraise=True, stop=stop_after_attempt(5), wait=wait_exponential(multiplier=1, min=4, max=10)) | |
| def do_something_flaky(succeed): | |
| print('Doing something flaky') | |
| if not succeed: | |
| print('Failed!') | |
| raise Exception('Failed!') |
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| from unittest import TestCase, mock, skip | |
| from main import do_something_flaky | |
| class TestFlakyRetry(TestCase): | |
| def test_succeeds_instantly(self): | |
| try: | |
| do_something_flaky(True) | |
| except Exception: | |
| self.fail('Flaky function should not have failed.') | |
| def test_raises_exception_immediately_with_direct_mocking(self): | |
| do_something_flaky.retry.sleep = mock.Mock() | |
| with self.assertRaises(Exception): | |
| do_something_flaky(False) | |
| def test_raises_exception_immediately_with_indirect_mocking(self): | |
| with mock.patch('main.do_something_flaky.retry.sleep'): | |
| with self.assertRaises(Exception): | |
| do_something_flaky(False) | |
| @skip('Takes way too long to run!') | |
| def test_raises_exception_after_full_retry_period(self): | |
| with self.assertRaises(Exception): | |
| do_something_flaky(False) |
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Nice one!