title: Click home icon with Espresso
body: <p>I am trying to click the home icon in some Espresso tests via:</p>
  
  <pre><code>onView(withId(android.R.id.home)).perform(click());
  </code></pre>
  
  <p>This works fine for Android > 3.0 - but fails for older versions as <code>appcompat</code> does not seem to use this id for this element then. What is a good approach to do what I want to do?</p>