title: what is the difference between Robolectric.setupActivity() and Robolectric.buildActivity()?
body: <p>I am new to the Robolectric ,please help me understand it ,
  what is the difference between these </p>
  
  <pre>loginActivity = new LoginActivity();
  loginActivity = Robolectric.setupActivity(LoginActivity.class);
  loginActivity = Robolectric.buildActivity(LoginActivity.class).create().start().resume().get();</pre>