@Test
public void testIsMapFieldMapOfStringSets_NoSet() throws Exception {

    Map<String, String> externalIds = new HashMap<>();
    externalIds.put("ext1", "id1");
    externalIds.put("ext2", "id2");
    Project project = new Project().setName("pname").setExternalIds(externalIds);
    boolean b = isMapFieldMapOfStringSets(Project._Fields.EXTERNAL_IDS, project, project, project, Logger.getLogger(CommonUtilsTest.class));
    assertThat(b, is(false));
}