How to test Service class methods which uses Mapstruct mappers in Springboot?

Question

@Mapper(uses = SomeMapper.class,imports = Date.class) public interface DomainModelMapper { Model domainToModel(Domain domain); @Mapping(target="dateUpdated", source="dateUpdated" ,defaultExpression = "java(Date.from(java.time.OffsetDateTime.now().toInstant()))") @Mapping(target="id.key",source="id.key",defaultExpression = "java(com.datastax.driver.core.utils.UUIDs.timeBased())") Domain modelToDomain(Model model); }

I have a mapper class to do some Date conversions

public class SomeMapper { public Date OffsetDateTimeToDate(OffsetDateTime offsetDateTime) { return offsetDateTime != null ? Date.from(offsetDateTime.toInstant()):null; } public OffsetDateTime DateToOffsetDateTime(Date date) { return date != null ? date.toInstant().atOffset(ZoneOffset.UTC) : null; } }

This is my service class where I use DomainModelMapper

@Service public class SomeServiceImpl implements SomeService { @Autowired someRepository someRepository; private final DomainModelMapper domainToModelMapper = Mappers.getMapper(DomainModelMapper.class); @Override public Model saveSomething(Model model) { return DomainModelMapper.domainToModel(someRepository .save(DomainModelMapper.modelToDomain(model))); }

How can I unit test saveSomething(Model model) method? How I can inject Mapstruct classes or mock them?

Nikolas · Accepted Answer · 2020-07-03 21:38:07Z

If you make the @Mapper interface as a Spring-based component model, then it can be autowired through @Autowired annotation. Read more at 4.2. Using dependency injection

@Mapper(uses = SomeMapper.class,imports = Date.class, componentModel = "spring") public interface DomainModelMapper { // IMPLEMENTATION }

@Service public class SomeServiceImpl implements SomeService { @Autowired SomeRepository someRepository; @Autowired DomainModelMapper domainModelMapper; // THE REST OF THE IMPLEMENTATION }

The testing becomes fairly easy since all the beans can be also injected in the @SpringBootTest with the @Autowired annotation.

The DomainModelMapper can be autowired and used in the unit test as is and rely on its implementation
The SomeRepository shall be either mocked using @MockBean which overwrites an existing bean or creates a new one if none of that type exists... or autowired as in the implementation if you use an in-memory database for the testing phase, such as H2.

In any case, the test class will be ready for testing.

@SpringBootTest public class SomeServiceTest { @Autowired // or @MockBean SomeRepository someRepository; @Autowired // no need to mock it DomainModelMapper domainModelMapper; @Test public void test() { // TEST } }

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