### Question:
CraftProperties { public Map<CraftPropertyName, TreeMap<Long, String>> getMap() { return map; } CraftProperties(Mmsi mmsi,
			Map<CraftPropertyName, TreeMap<Long, String>> map);  CraftProperties(Mmsi mmsi); Map<CraftPropertyName, TreeMap<Long, String>> getMap(); Mmsi getMmsi(); CraftProperties add(CraftProperty p);  }### Answer:
@Test public void testIsEmpty() { CraftProperties c = create(); assertTrue(c.getMap().entrySet().isEmpty()); }