build(gulp): use --reporters argument for karma/karma-fast tasks

Allow overriding configured defaults via CLI

Closes #3629.

Author: caitp

gulp/tasks/karma-fast.js

@@ -21,6 +21,11 @@ exports.task = function (done) {
   }
   // NOTE: `karma-fast` does NOT test Firefox by default.
 
+  if ( args.reporters ) {
+    karmaConfig.reporters = args.reporters.trim().split(',');
+  }
+
+
   gutil.log('Running unit tests on unminified source.');
   karma.start(karmaConfig, captureError(clearEnv,clearEnv));
 

gulp/tasks/karma.js

@@ -43,6 +43,10 @@ exports.task = function (done) {
     karmaConfig.browsers = ['Firefox', 'PhantomJS'];
   }
 
+  if ( args.reporters ) {
+    karmaConfig.reporters = args.reporters.trim().split(',');
+  }
+
   gutil.log('Running unit tests on unminified source.');
   karma.start(karmaConfig, captureError(testMinified,clearEnv));