Tests: Use karma to launch browsers locally if installed.

gulpfile.js

@@ -65,7 +65,7 @@ var testMocha = function() {
 };
 
 var testKarma = shell.task([
-  './node_modules/karma/bin/karma start --single-run --browsers Firefox'
+  './node_modules/karma/bin/karma start'
 ]);
 
 /**

karma.conf.js

@@ -2,12 +2,35 @@
 
 // karma.conf.js
 module.exports = function(config) {
+
   config.set({
-    frameworks: ['mocha'],
-    browsers: ['Chrome', 'Firefox'],
+    browsers: ['Firefox'],
+    frameworks: ['mocha', 'detectBrowsers'],
+    detectBrowsers: {
+      enabled: true,
+      usePhantomJS: false,
+      postDetection: function(availableBrowser) {
+        // modify to enable additional browsers if available
+        var runBrowsers = ['Firefox', 'Chrome'];
+        var browsers = [];
+        for(var i = 0; i < runBrowsers.length; i++) {
+          if(~availableBrowser.indexOf(runBrowsers[i])) {
+            browsers.push(runBrowsers[i]);
+          }
+        }
+        return browsers;
+      }
+    },
     singleRun: true,
     files: [
       'browser/tests.js'
+    ],
+    plugins: [
+      'karma-mocha',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher',
+      'karma-detect-browsers'
     ]
   });
+
 };

package.json

@@ -109,6 +109,8 @@
     "jsdoc": "^3.3.0-alpha11",
     "jsdoc-to-markdown": "=0.5.9",
     "karma": "^0.12.28",
+    "karma-chrome-launcher": "^0.1.7",
+    "karma-detect-browsers": "^0.1.3",
     "karma-firefox-launcher": "^0.1.3",
     "karma-mocha": "^0.1.9",
     "mocha": "~2.0.1",