The author explains how Preact achieves running 1000+ tests in under one second by minimizing unnecessary test isolation overhead common in modern test runners. By opting out of strict isolation where not needed and leveraging the browser's native performance, they demonstrate that significant speedups are possible without sacrificing correctness.
Background
Modern frontend test runners often prioritize strict test isolation by default, which can significantly slow down execution times. This article challenges that norm by showing how selective isolation can optimize test suite performance.
- Source
- Lobsters
- Published
- Jul 11, 2026 at 02:00 AM
- Score
- 7.0 / 10