title: How to test Menu
body: <p>I need to cover Menu functionality by unit tests, however I'm struggling to obtain Menu object. </p>
  
  <p>Following test case fails (mMenu is null):</p>
  
  <pre><code>sendKeys(KeyEvent.KEYCODE_MENU);
  mMenu = (Menu) mActivity.findViewById(com.###.###.R.id.main_menu);
  assertNotNull(mMenu);
  </code></pre>
  
  <p>Please advice. Thank you.</p>