How to use MyBatis mappers in Spring's JUnit tests? - spring

Question

For tests I use:
Spring Test 3.2.3.RELEASE
JUnit 4.12
Mockito 1.10.19
The following test code should save some entity into the database, however, this does not occur:
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration(classes = {ControllerTestConfig.class})
public class ControllerTest {
#Autowired
SomeMapper someMapper;
#Test
public void shouldCreateSomeEntity() {
SomeEntity someEntity = new SomeEntity();
someEntity.setSomeProperty("property");
...
someMapper.createSomeEntity(someEntity);
}
...
}
I use a simulated implementation of the mapper:
#Configuration
public class ControllerTestConfig {
#Bean
public SomeMapper SomeMapper() {
return Mockito.mock(SomeMapper.class);
}
...
}
Because the implementation is simulated, the method call is intercepted in the class org.mockito.internal.creation.cglib.MethodInterceptorFilter.
The mapper is an interface:
public interface SomeMapper {
#Insert("Insert into some_table (id, some_entity_id, type, full_name) values (#{id}, #{someEntityId}, #{type}, #{fullName})")
#SelectKey(statement="select nextval('seqid_static_data');", keyProperty="id", before=true, resultType=long.class)
void createSomeEntity(SomeEntity someEntity);
...
}
Thus, it is not possible to create an instance of this mapper. For example, by this way:
#Bean
public SomeMapper SomeMapper() {
return new SomeMapper();
}
...
How to use MyBatis mappers in Spring's JUnit tests?

Answer 1

Did you try to emulate method call by doAnswer or doThrow, they should works with void methods. For example:
#Test
public void shouldCreateSomeEntity() {
SomeEntity someEntity = new SomeEntity();
someEntity.setSomeProperty("property");
Mockito.doAnswer(invocation -> {
invocation.getArgument(0).setSomeProperty("changed_property")
}).when(someMapper).createSomeEntity(Mockito.eq(someEntity));
someMapper.createSomeEntity(someEntity);
Assert.assertEquals("changed_property", someEntity.getSomeProperty());
}