Gruntfile.js 中有 mocha 却提示jit-grunt: Plugin for the "mocha" task not found.

Question

// Mocha testing framework configuration options
mocha: {
 all: {
   options: {
     run: true,
     urls: ['http://<%= browserSync.test.options.host %>:<%= browserSync.test.options.port %>/index.html']
   }
 }
},