Reading Notes of The Art Of Unit Test Ch7
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Reading Notes of The Art Of Unit Test Ch7
- 1. THE ART OF UNIT TESTING – TRUSTWORTHY TEST READING NOTES BY BENJAMIN FAN
- 2. AGENDA • What makes unit tests good • Untrustworthy failing tests • Untrustworthy passing tests • Dealing with flaky test
- 3. WHAT MAKES UNIT TESTS GOOD • Trustworthiness • The test fails and you’re genuinely worried that something broke. • The test passes and you feel relaxed. • Maintainability • Readability • Without readability, the other two pillars fall pretty quickly.
- 4. UNTRUSTWORTHY FAILINGTESTS • A real bug not been covered in tests -> you can only trust this kind of fail • A buggy test gives a false failure • The test is out of date due to a change in functionality -> will dig in deeper in next chapter • The test conflicts with another test • The test is flaky
- 5. HOW BUGGYTEST HAPPENED • Logic in unit test • switch, if, or else statements • foreach, for, or while loops • Concatenations (+ sign, etc.) • try, catch • The best way to avoid buggy test is to adoptTest-driven development (TDD).
- 6. HOW BUGGYTEST HAPPENED • Code under test • Test with logic in it
- 7. HOW BUGGYTEST HAPPENED • A more trustworthy test
- 8. HOW BUGGYTEST HAPPENED • A name-finding function • Loops and ifs in a test
- 9. UNTRUSTWORTHY PASSING TESTS • The test contains no asserts -> may has hidden asserts • Can’t (Hard to) understand the test -> Readability • Unit tests are mixed with flaky integration tests • keeping your integration and unit tests in separate places • The test verifies multiple concerns or exit points • The test keeps changing • random numbers, dynamically generated values
- 10. UNTRUSTWORTHY PASSING TESTS • Can’t (Hard to) understand the test • Tests with bad names • Tests that are too long or have convoluted code • Tests containing confusing variable names • Tests containing hidden logic or assumptions that cannot be understood easily • Test results that are inconclusive (neither failed nor passed) • Test messages that don’t provide enough information
- 11. THE TESTVERIFIES MULTIPLE CONCERNS OR EXIT POINTS • A sample function to test • Checking two exit points in the same test
- 12. DEALINGWITH FLAKY TEST Unit tests Component tests Integration tests API tests E2E/UI isolated tests E2E/UI system tests Flakiness caused by • Shared memory resources • Threads • Random values • Dynamically generated inputs/outputs • Time • Logic bugs Flakiness also caused by • Shared resources • Network issues • Configuration issues • Permission issues • Load issues • Security issues • Other systems are down • And more...
- 13. TAKE AWAY • Trustworthy matter especially in test. • Avoid complexity in tests, such as creating dynamic expected values or duplicating logic from the underlying production code. • If a test doesn’t have any asserts, you can’t understand what's it’s doing. • To better identify flaky tests, put them in a special category or folder that can be run separately. • To reduce test flakiness, either fix the tests, convert flaky higher-level tests into less flaky lower-level ones, or delete them.
- 14. Q&A