@Test
public void check_a_patch_can_add_an_entry() throws Exception {

    Map<String, String> patch = new HashMap<String, String>() {{
        put("c", "3");
    }};
    PatchUtil.setMap(testObject.getMap(), patch, true);
    assertThat(testObject.getMap()).containsEntry("a","1").containsEntry("b", "2").containsEntry("c", "3");
}