add mocha + chai

Gruntfile.js

@@ -22,10 +22,20 @@ module.exports = function(grunt) {
       files: [
         'Gruntfile.js',
         'src/**/*.js',
+        'test/**/*.js'
       ]
+    },
+    mochaTest: {
+      test: {
+        options: {
+          reporter: 'spec'
+        },
+        src: ['test/**/*.js']
+      }
     }
   });
 
   // user defined tasks
-  grunt.registerTask('default', ['jshint', 'uglify']);
+  grunt.registerTask('test', ['mochaTest']);
+  grunt.registerTask('default', ['jshint', 'mochaTest', 'uglify']);
 };

package.json

@@ -10,10 +10,13 @@
   "main": "timestring.js",
   "version": "1.0.2",
   "devDependencies": {
+    "chai": "^1.9.1",
     "grunt": "^0.4.5",
     "grunt-contrib-jshint": "^0.10.0",
     "grunt-contrib-uglify": "^0.5.0",
+    "grunt-mocha-test": "^0.11.0",
     "load-grunt-tasks": "^0.6.0",
+    "mocha": "^1.20.1",
     "time-grunt": "^0.4.0"
   }
 }