@Test
public void findFirstKeyJSONObjectTestNestJSONObject() throws Exception
{

  final String joString = "{\"a\":{\"b\":{\"c\":\"d\"}}}";
  JSONObject jo = new JSONObject(joString);
  JSONObject joFind = SchemaUtils.findFirstKeyJSONObject(jo, "b");
  Assert.assertEquals(1, joFind.length());
  Assert.assertEquals("d", joFind.getString("c"));
}