`grunt-mocha-blanket` is a Grunt plugin that runs client‑side Mocha tests inside PhantomJS while collecting live code‑coverage data with Blanket.js, without creating separate instrumented copies of the source. It reports coverage directly to the Grunt task, lets you enforce per‑file, per‑module or global coverage thresholds, and fails the build when those thresholds aren’t met—making it useful for front‑end JavaScript projects that need automated testing and strict coverage enforcement.