I made my Vitest suite in Nuxt run ten times faster
The article discusses how the author optimized their Vitest test suite for a Nuxt application, reducing the runtime from 3 minutes to under 20 seconds.
Why it matters
Optimizing test suite performance is crucial for developer experience, as slow tests can hinder the development workflow.
Key Points
- 1The author's Nuxt module test suite was taking 3 minutes to run
- 2The bottleneck was that each test file was creating a separate Nuxt app instance
- 3Merging the separate test apps into one reduced the runtime to about half
- 4Further optimization was needed to reuse the same Nuxt app instance across all tests
Details
The author was using separate Nuxt app instances for each test file, which took a long time to boot up. They initially merged the separate test apps into one, which cut the runtime in half. However, the E2E test files were still creating new Nuxt app instances for each test. The author needed a way to ensure all tests used the same underlying Nuxt app instance, which would only start once and then be reused by all tests, leading to a significant speed-up.
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