@Test
public void check_a_patch_can_update_a_value() throws Exception {

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