add test task as npm script

Gruntfile.js

@@ -193,6 +193,14 @@ module.exports = function(grunt) {
     'jscs'
   ]);
 
+  grunt.registerTask('test', [
+    'clean:test',
+    'clean:tmp',
+    'babel:distTestNoSystemJs',
+    'babel:distTestsSpecsNoSystemJs',
+    'mochaTest'
+  ]);
+
   grunt.registerTask('bench', [
     'clean:test',
     'clean:tmp',

package.json

@@ -4,8 +4,9 @@
   "version": "3.6.0",
   "description": "Zabbix plugin for Grafana",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "./node_modules/.bin/grunt"
+    "test": "./node_modules/.bin/grunt test",
+    "build": "./node_modules/.bin/grunt",
+    "watch": "./node_modules/.bin/grunt watch"
   },
   "repository": {
     "type": "git",