title: Error (23,17) Failed to resolve junit:junit: 4.12 @ Android Studio v.2
body: <p>Currently using Android studio v.2.0 
  when first time application opened. It showed Error</p>
  
  <p><code>(23,17) Failed to resolve junit:junit: 4.12</code></p>
  
  <p>I have installed Android Support Repository, support repository</p>
  
  <p>My Gradle code in the picture.<a href="http://i.stack.imgur.com/fQWVf.png" rel="noreferrer">Android Studio V.2.0</a></p>