Fix name of test spec in mutation-test

[Cito]

No description provided.

[codecov]

Codecov Report

Merging #378 (9e382b9) into main (3796e09) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #378   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          744       744           
  Branches        48        48           
=========================================
  Hits           744       744           

Impacted Files	Coverage Δ
src/mutation/__tests__/mutation-test.ts	100.00% <100.00%> (ø)

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