Sinon: add support for transforming callsFake

[kristerkari]

Hello!

When running the codemods on a quite large test suite, I noticed that sinon.stub(obj, 'prop').callsFake(fn) does not seem to be transformed. Docs: https://sinonjs.org/releases/latest/stubs/#properties

I changed it so, that

sinon.stub(I18n, 'extend').callsFake(fn => fn);

will be turned into

jest.spyOn(I18n, 'extend').mockClear().mockImplementation(fn => fn);

which should be the expected result.

I also added a couple of additional test cases to verify that sinon.stub() without arguments is transformed correctly (no changes in the code were needed).

ping @skovhus

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (87daaa6) 92.39% compared to head (bf3c0e1) 92.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #500      +/-   ##
==========================================
+ Coverage   92.39%   92.42%   +0.02%     
==========================================
  Files          26       26              
  Lines        1934     1940       +6     
  Branches      404      405       +1     
==========================================
+ Hits         1787     1793       +6     
  Misses        101      101              
  Partials       46       46              

Impacted Files	Coverage Δ
src/transformers/sinon.ts	90.74% <100.00%> (+0.20%)	⬆️

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[skovhus]

Awesome! Thanks for taking your time fixing this.