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deepmind.google·6d ago
AI Engineering
Lobsters·25d ago·5 min read
Running 1000 tests in 1s (2022)
TL;DR
Many modern test runners apply excessive isolation, slowing down test execution. By selectively opting into necessary isolation, Preact achieves running 1003 tests in just 1 second.
✦ Why It Matters
Engineers should consider adjusting test isolation levels in their frameworks to improve test execution speed.
Key Takeaways
- Evaluate the necessity of test isolation in your projects.
- Experiment with running tests against the real DOM for speed.
- Adopt Preact's approach to streamline your test suite.
- Aim for rapid feedback cycles to enhance development efficiency.
Full Summary
In the realm of frontend development, fast test execution is often hindered by the default isolation levels set by popular test runners. Preact, a framework for building web applications, has demonstrated that it is possible to run 1003 tests in approximately 1 second by focusing on essential test isolation.
The tests primarily assert that the correct output is rendered against the real Document Object Model (DOM) in browsers. By simplifying the testing approach and leveraging the browser's capabilities, Preact's suite showcases a significant speed advantage.
This method not only enhances developer productivity but also sets a new benchmark for testing efficiency in web development. The results indicate that with the right strategy, developers can achieve rapid feedback cycles, which is crucial for agile development practices.