add unit testing

gulpfile.js

@@ -3,6 +3,7 @@ var browserify = require('browserify')
 var rename = require('gulp-rename');
 var source = require('vinyl-source-stream');
 var jshint = require('gulp-jshint');
+var qunit = require('gulp-qunit');
 
 gulp.task('build', function() {
     var app = browserify('./src/main.js');
@@ -12,6 +13,11 @@ gulp.task('build', function() {
         .pipe(gulp.dest('./dist'))
 });
 
+gulp.task('test', ['build'], function() {
+    return gulp.src('./test/index.html')
+        .pipe(qunit());
+});
+
 gulp.task('lint', function() {
   return gulp.src('./src/**/*.js')
     .pipe(jshint())