@Test
public void testNonExistentKeys() throws Exception {

  Assert.assertNull(mySkinLayoutDefinition.get("foo"));
  Assert.assertNull(mySkinLayoutDefinition.get("layouts.bar"));
  Assert.assertNull(mySkinLayoutDefinition.get("layouts.portrait.zzz"));
  Assert.assertNull(mySkinLayoutDefinition.get("layouts.portrait.width.foo"));
}