Best Mockito code snippet using org.mockitousage.stubbing.StubbingWithThrowablesTest.times_never_atLeast_atMost_verificationModes_should_work
times_never_atLeast_atMost_verificationModes_should_work
Using AI Code Generation
1public void times_never_atLeast_atMost_verificationModes_should_work() {2 doThrow(new RuntimeException("1")).doThrow(new RuntimeException("2")).doThrow(new RuntimeException("3")).doThrow(new RuntimeException("4")).when(mock).simpleMethod();3 try {4 mock.simpleMethod();5 } catch (RuntimeException e) {6 }7 try {8 mock.simpleMethod();9 } catch (RuntimeException e) {10 }11 try {12 mock.simpleMethod();13 } catch (RuntimeException e) {14 }15 try {16 mock.simpleMethod();17 } catch (RuntimeException e) {18 }19 verify(mock, times(2)).simpleMethod();20 verify(mock, never()).booleanReturningMethod();21 verify(mock, atLeastOnce()).simpleMethod();22 verify(mock, atLeast(2)).simpleMethod();23 verify(mock, atMost(2)).simpleMethod();24}25public void times_never_atLeast_atMost_verificationModes_should_work() {26 doThrow(new RuntimeException("1")).doThrow(new RuntimeException("2")).doThrow(new RuntimeException("3")).doThrow(new RuntimeException("4")).when(mock).simpleMethod();27 try {28 mock.simpleMethod();29 } catch (RuntimeException e) {30 }31 try {32 mock.simpleMethod();33 } catch (RuntimeException e) {34 }35 try {36 mock.simpleMethod();37 } catch (RuntimeException e) {38 }39 try {40 mock.simpleMethod();41 } catch (RuntimeException e) {42 }43 verify(mock, times(2)).simpleMethod();44 verify(mock, never()).booleanReturningMethod();45 verify(mock, atLeastOnce()).simpleMethod();46 verify(mock, atLeast(2)).simpleMethod();47 verify(mock, atMost(2)).simpleMethod();48}49public void times_never_atLeast_atMost_verificationModes_should_work() {50 doThrow(new RuntimeException("1")).doThrow(new RuntimeException("2")).doThrow(new RuntimeException("3")).doThrow(new RuntimeException("4")).when(mock).simpleMethod();51 try {52 mock.simpleMethod();53 } catch (RuntimeException e) {54 }55 try {56 mock.simpleMethod();
times_never_atLeast_atMost_verificationModes_should_work
Using AI Code Generation
1import org.junit.jupiter.api.Test;2import org.junit.jupiter.api.extension.ExtendWith;3import org.mockito.junit.jupiter.MockitoExtension;4import org.mockitousage.IMethods;5import org.mockitoutil.TestBase;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.catchThrowable;8import static org.mockito.Mockito.*;9@ExtendWith(MockitoExtension.class)10class StubbingWithThrowablesTest extends TestBase {11 void should_allow_stubbing_void_methods_to_throw_exceptions() {12 IMethods mock = mock(IMethods.class);13 doThrow(new RuntimeException()).when(mock).simpleMethod();14 assertThat(catchThrowable(mock::simpleMethod)).isInstanceOf(RuntimeException.class);15 }16 void should_allow_stubbing_non_void_methods_to_throw_exceptions() {17 IMethods mock = mock(IMethods.class);18 when(mock.objectReturningMethodNoArgs()).thenThrow(new RuntimeException());19 assertThat(catchThrowable(mock::objectReturningMethodNoArgs)).isInstanceOf(RuntimeException.class);20 }21 void should_allow_stubbing_non_void_methods_to_throw_exceptions_with_different_return_type() {22 IMethods mock = mock(IMethods.class);23 when(mock.objectReturningMethodNoArgs()).thenThrow(new RuntimeException());24 assertThat(catchThrowable(mock::objectReturningMethodNoArgs)).isInstanceOf(RuntimeException.class);25 }26 void should_allow_stubbing_non_void_methods_to_throw_exceptions_with_different_return_type_2() {27 IMethods mock = mock(IMethods.class);28 when(mock.objectReturningMethodNoArgs()).thenThrow(new RuntimeException());29 assertThat(catchThrowable(mock::objectReturningMethodNoArgs)).isInstanceOf(RuntimeException.class);30 }31 void should_allow_stubbing_non_void_methods_to_throw_exceptions_with_different_return_type_3() {32 IMethods mock = mock(IMethods.class);33 when(mock.objectReturningMethodNoArgs()).thenThrow(new RuntimeException());34 assertThat(catchThrowable(mock::objectReturningMethodNoArgs)).isInstanceOf(RuntimeException.class);35 }
Proper way of using and testing generated mapper
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There are two options I'd advise here.
If you want to unit test then mock your mapper in the service (other dependencies as well OFC) and test service logic only. For the mapper write a separate unit test suite. I created a code example here: https://github.com/jannis-baratheon/stackoverflow--mapstruct-mapper-testing-example.
Excerpts from the example:
Service class:
public class AService {
private final ARepository repository;
private final EntityMapper mapper;
public AService(ARepository repository, EntityMapper mapper) {
this.repository = repository;
this.mapper = mapper;
}
public ADto getResource(int id) {
AnEntity entity = repository.getEntity(id);
return mapper.toDto(entity);
}
}
Mapper:
import org.mapstruct.Mapper;
@Mapper
public interface EntityMapper {
ADto toDto(AnEntity entity);
}
Service unit test:
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import org.junit.Before;
import org.junit.Test;
public class AServiceTest {
private EntityMapper mapperMock;
private ARepository repositoryMock;
private AService sut;
@Before
public void setup() {
repositoryMock = mock(ARepository.class);
mapperMock = mock(EntityMapper.class);
sut = new AService(repositoryMock, mapperMock);
}
@Test
public void shouldReturnResource() {
// given
AnEntity mockEntity = mock(AnEntity.class);
ADto mockDto = mock(ADto.class);
when(repositoryMock.getEntity(42))
.thenReturn(mockEntity);
when(mapperMock.toDto(mockEntity))
.thenReturn(mockDto);
// when
ADto resource = sut.getResource(42);
// then
assertThat(resource)
.isSameAs(mockDto);
}
}
Mapper unit test:
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Before;
import org.junit.Test;
public class EntityMapperTest {
private EntityMapperImpl sut;
@Before
public void setup() {
sut = new EntityMapperImpl();
}
@Test
public void shouldMapEntityToDto() {
// given
AnEntity entity = new AnEntity();
entity.setId(42);
// when
ADto aDto = sut.toDto(entity);
// then
assertThat(aDto)
.hasFieldOrPropertyWithValue("id", 42);
}
}
The second option is to make an integration test where you inject a real mapper to the service. I'd strongly advise not to put too much effort into validating the mapping logic in integration tests though. It's very likely to get messy. Just smoke test the mappings and write unit tests for the mapper separately.
To sum up:
I usually choose option number two where I test main application paths with MockMvc
and write complete unit tests for smaller units.
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