### Question:
DefaultPathItemDiffValidatorFactory implements PathItemDiffValidatorFactory { @Override public List<PathItemDiffValidator> create() { List<PathItemDiffValidator> validators = new ArrayList<>(); validators.add(new PathItemOperationsDiffValidator(operationDiffValidatorFactory.create())); validators.add(new PathItemParametersDiffValidator(parameterDiffValidatorFactory.create())); validators.add(new PathItemDeleteNotAllowedDiffValidator()); return Collections.unmodifiableList(validators); } DefaultPathItemDiffValidatorFactory(
      OperationDiffValidatorFactory operationDiffValidatorFactory,
      ParameterDiffValidatorFactory parameterDiffValidatorFactory); @Override List<PathItemDiffValidator> create();  }### Answer:
@Test public void create() { List<PathItemDiffValidator> validators = validatorFactory.create(); assertThat(validators).hasSize(3); }