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Migrate from Mocha to Vitest #2789

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Migrate from Mocha to Vitest #2789

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@2nofa11 2nofa11 commented Jul 12, 2025 •
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Summary

Migrates the test framework from Mocha to Vitest to significantly improve test execution performance.

Closes #2787

Changes Made

060f779 - Initial Migration (Automated)

3b667b0 - Manual Configuration & Integration Fixes

  • Added vitest.config.ts with comprehensive test configuration:
    • Coverage provider set to v8
    • Configured include/exclude patterns
  • Fixed integration tests to address Vitest worker limitations (vitest#1436):
    • Replaced process.chdir() usage with cwd option in cp.execSync() calls
    • Updated tests/integrations/eslint-plugin-import.js
    • Updated tests/integrations/flat-config.js
    • Replaced before/after hooks with beforeAll

ec06a3e - Global API Configuration

  • Updated eslint.config.mjs to use vitest globals instead of mocha

Migration Details

  • Test Coverage: All 11,059 tests pass without modification
  • Compatibility: Maintains ESLint RuleTester compatibility
  • Performance: 67% faster execution (74s → 24s)
  • Configuration: Comprehensive vitest.config.ts with:
    • V8 coverage provider
    • HTML and LCOV reporting
    • Proper include/exclude patterns
    • Global API configuration

Test Plan

  • All existing tests pass (11,059 tests)
  • Integration tests work correctly
  • Coverage reporting functional
  • Performance improvement verified
  • CI/CD pipeline validation needed

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changeset-bot bot commented Jul 12, 2025

⚠️ No Changeset found

Latest commit: ec06a3e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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2nofa11
2nofa11 commented Jul 12, 2025
View reviewed changes
tests/integrations/eslint-plugin-import.js

before(() => {
originalCwd = process.cwd()
process.chdir(path.join(__dirname, 'eslint-plugin-import'))
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Migrating to Vitest resulted in a Flaky test, because process.chdir() is not supported by Vitest (vitest-dev/vitest#1436).
So I substituted execSync({ cwd }).

@2nofa11 2nofa11 force-pushed the chore/migrate-to-vitest branch from ec06a3e to 97312e7 Compare July 12, 2025 09:30
@2nofa11 2nofa11 marked this pull request as ready for review July 12, 2025 10:51
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Migrate to Vitest
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