A small guide into installing jscoverage. Also see mocha-blanket.


Install via npm

npm install --save-dev jscoverage

Ignore output

echo coverage.html >> .gitignore


The coverage task injects your source files (lib) with jscoverage hooks, runs mocha -R html-cov, then restores later.

/* directory */
"coverage": "mv lib lib~; (jscoverage lib~ lib; mocha -R html-cov > coverage.html); rm -rf lib; mv lib~ lib"
/* single file */
"coverage": "(cp index.js index.js~; jscoverage index.js; mv index-cov.js index.js; mocha -R html-cov > coverage.html); mv index.js~ index.js"


npm run coverage
open coverage.html


If you’re using jsdom, be sure to expose the window._$jscoverage variable into the global scope.

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