### Question:
TSTargetFactory { static Map<String, TSTargetType> mapNamespaces(Map<String, TSTargetType> typeParamMap, NameSpaceMapper mapper) { if (mapper == IDENTITY) return typeParamMap; Map<String, TSTargetType> result = new HashMap<>(); for (Map.Entry<String, TSTargetType> x : typeParamMap.entrySet()) { result.put(x.getKey(), x.getValue().mapNameSpace(mapper)); } return result; }  static Either<String,TSTargetType> createTSTargetByDSL(String mappingString); static Either<String,TSTargetType> createTSTargetByDSLWithNS(String mappingString); static TSTargetType createTSTargetFromArray(TSTargetType embeddedType);  }### Answer:
@Test @DisplayName("Check returning IDENTITY when calling TargetFactory") void checkIdentity() { Map<String, TSTargetType> emptyMap=new HashMap<>(); Map<?,?> x1 = TSTargetFactory.mapNamespaces(emptyMap, x -> x); Map<?,?> x2 = TSTargetFactory.mapNamespaces(emptyMap, IDENTITY); Map<?,?> testee = TSTargetFactory.mapNamespaces(emptyMap, IDENTITY); assertEquals(testee, x2); assertEquals(testee, x1); }