Add Stryker Mutator for Mutation Testing and Debugging CopyFile Issue #23
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added stryker mutator for mutation testing and set it up with mocha as the test runner
modified the return statement at line 114 in src/cli/index.js because caught an error when running tests where return was outside of a function
tried debugging the ENOTSUP copyfile issue by modifiying stryker.config.json and adding .strykerignore exclude problem files, but it still doesn't pass
was able to get green on ProjectReader, Instrumenter, and ConcurrencyTokenProvider, but stryker still fails on copyfile ENOTSUP. tried different ways to exclude build/public/plugins/ but no luck so far
added full test output in stryker_output.txt
ran npx stryker run, but the test didn’t complete, so no mutation report was generated. full output is in stryker_output.txt.