Subchapter 2.4

9002 Adopt Vitest

evals/fixtures/adr/9002-adopt-vitest.mdMarkdown681 BView on GitHub

9002 - Adopt Vitest as the unit test runner

Superseded by ADR-9005.

Context and problem statement

The client codebase needed a single, fast unit test runner with native ESM and TypeScript support.

Adopt Vitest as the standard unit test runner for all client packages. New unit tests are written for Vitest.

One runner across client packages.
Superseded: ADR-9005 later reversed this in favor of Jest for alignment with the shared mocking utilities. Do not write new tests against this decision; see ADR-9005.

evals/fixtures/adr/9002-adopt-vitest.md