✅ Move tests to Vitest

[dubzzz]

My target is to be able to make fast-check ES Modules first.

I initially attempted to stick to Jest, but I failed. More precisely having Jest in ES Modules mode required: experimental flags, usage of unstable APIs, using arrow imports instead of normal ones, migrating out of spies and relying on requireActual while I'd need to importActual (aka missing API).

Unfortunately I was not able to reach an acceptable state. he main blocker being the arrow import that would impose to add some linting rule to make sure that all my tests do only arrow imports. The next blocker was rewriting all the spies to move them to mock and spies.

So I got directed to Vitest. I tried and spies were ok, import too.

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• ⚡️ Improve performance
• Other(s): ...

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 7a58359:

Sandbox	Source
@fast-check/examples	Configuration

[github-actions]

👋 A preview of the new documentation is available at: http://6612984cbdfc6fb490ba0273--dubzzz-fast-check.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.57%. Comparing base (08079e1) to head (7a58359).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4871      +/-   ##
==========================================
+ Coverage   93.49%   93.57%   +0.07%     
==========================================
  Files         207      209       +2     
  Lines        5015     5093      +78     
  Branches     1314     1360      +46     
==========================================
+ Hits         4689     4766      +77     
+ Misses        326      300      -26     
- Partials        0       27      +27     

Flag	Coverage Δ
unit-tests	93.57% <ø> (+0.07%)	⬆️
unit-tests-18.x-Linux	93.57% <ø> (+0.07%)	⬆️
unit-tests-20.x-Linux	93.57% <ø> (+0.07%)	⬆️
unit-tests-latest-Linux	93.57% <ø> (+0.07%)	⬆️

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[github-actions]

👋 A preview of the new documentation is available at: http://66129b5c00c5bfbc9c091bdc--dubzzz-fast-check.netlify.app

[dubzzz]

From my first measurements, with the same coverage reporter in place for both Jest and Vitest, Vitest is 33% slower. But I hope to make it faster with some cleaning and no globals mode.

[github-actions]

👋 A preview of the new documentation is available at: http://66129e091f1acab74c039ae1--dubzzz-fast-check.netlify.app