Writing better tests for your JavaScript app
summary
Shows concrete patterns and tools: uses Jest snapshot testing and Enzyme to keep most tests in-process, mock external HTTP with fetch-mock, and control timers to avoid waits. Raises functions into pure modules, uses a test seam or in-memory SQLite for reproducible subcutaneous API tests, and runs higher-level checks with supertest. Recommends UI tests only for deployment smoke checks and encapsulating interactions with the page object pattern. Demonstrates defensive checks (fail on unmatched API calls) and reports that snapshots drastically speed maintenance.
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chapters (11)
- 0:00Introduction to testing
- 1:26Defining testing goals
- 3:27Testing strategies
- 8:06Unit testing fundamentals
- 11:53Snapshot testing techniques
- 24:47High-level testing
- 28:49SPA and node API testing
- 37:40Subcutaneous testing
- 46:44Integration testing
- 50:00Page object pattern
- 56:33Conclusion and recap
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