title: How to regain Access on a Activity after sending it to background
body: <p>With Espresso I try to test sending an Activity to background, with the Home button and then getting it up in the foreground again to make some checks: </p>
  
  <pre><code>@EspressoTest
  public void test() {
      onSomeView().check(matches(isDisplayed()));
      getInstrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_HOME);
  
      Context context = getInstrumentation().getTargetContext();
      Intent intent = new Intent(context, MainActivity.class);
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      context.startActivity(intent);
  
      onSomeView().check(matches(isDisplayed()));
  }
  </code></pre>
  
  <p>I had to use <code>intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);</code> which was suggested by an exception, but apart of that I also tested, starting it as the Launcher Activity, or using 
  <code>FLAG_ACTIVITY_REORDER_TO_FRONT</code>, but the view is not visible. Even though the test passes.</p>