eugenp · davidmartinezbarua · Jul 6, 2025 · Jun 12, 2025
diff --git a/mapstruct-2/pom.xml b/mapstruct-2/pom.xml
@@ -25,6 +25,18 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>     
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>${springframework.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${springframework.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <finalName>mapstruct-2</finalName>
@@ -60,6 +72,7 @@
     <properties>
         <org.mapstruct.version>1.6.3</org.mapstruct.version>
         <lombok.mapstruct.binding.version>0.2.0</lombok.mapstruct.binding.version>
+        <springframework.version>6.2.1</springframework.version>
     </properties>
 
 </project>
diff --git a/mapstruct-2/src/main/java/com/baeldung/dto/MediaDto.java b/mapstruct-2/src/main/java/com/baeldung/dto/MediaDto.java
@@ -0,0 +1,37 @@
+package com.baeldung.dto;
+
+public class MediaDto {
+
+    private Long id;
+
+    private String title;
+
+    public MediaDto(Long id, String title) {
+        this.id = id;
+        this.title = title;
+    }
+
+    public MediaDto() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    @Override
+    public String toString() {
+        return "MediaDto{" + "id=" + id + ", title='" + title + '\'' + '}';
+    }
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/entity/Media.java b/mapstruct-2/src/main/java/com/baeldung/entity/Media.java
@@ -0,0 +1,37 @@
+package com.baeldung.entity;
+
+public class Media {
+
+    private Long id;
+
+    private String title;
+
+    public Media(Long id, String title) {
+        this.id = id;
+        this.title = title;
+    }
+
+    public Media() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    @Override
+    public String toString() {
+        return "Media{" + "id=" + id + ", title='" + title + '\'' + '}';
+    }
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/mapper/MediaMapper.java b/mapstruct-2/src/main/java/com/baeldung/mapper/MediaMapper.java
@@ -0,0 +1,15 @@
+package com.baeldung.mapper;
+
+import org.mapstruct.Mapper;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+
+@Mapper
+public interface MediaMapper {
+
+    MediaDto toDto(Media media);
+
+    Media toEntity(MediaDto mediaDto);
+
+}
diff --git a/mapstruct-2/src/main/java/com/baeldung/service/MediaService.java b/mapstruct-2/src/main/java/com/baeldung/service/MediaService.java
@@ -0,0 +1,26 @@
+package com.baeldung.service;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+import com.baeldung.mapper.MediaMapper;
+
+public class MediaService {
+
+    final Logger logger = LoggerFactory.getLogger(MediaService.class);
+
+    private final MediaMapper mediaMapper;
+
+    public MediaService(MediaMapper mediaMapper) {
+        this.mediaMapper = mediaMapper;
+    }
+
+    public Media persistMedia(MediaDto mediaDto) {
+        Media media = mediaMapper.toEntity(mediaDto);
+        logger.info("Persist media: {}", media);
+        return media;
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/service/MediaServiceGeneratedMapperUnitTest.java b/mapstruct-2/src/test/java/com/baeldung/service/MediaServiceGeneratedMapperUnitTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.service;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.mapstruct.factory.Mappers;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+import com.baeldung.mapper.MediaMapper;
+
+public class MediaServiceGeneratedMapperUnitTest {
+
+    @Test
+    public void whenGeneratedMapperIsUsed_thenActualValuesAreMapped() {
+        MediaService mediaService = new MediaService(Mappers.getMapper(MediaMapper.class));
+        MediaDto mediaDto = new MediaDto(1L, "title 1");
+        Media persisted = mediaService.persistMedia(mediaDto);
+        assertEquals(mediaDto.getId(), persisted.getId());
+        assertEquals(mediaDto.getTitle(), persisted.getTitle());
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/service/MediaServiceMockedMapperUnitTest.java b/mapstruct-2/src/test/java/com/baeldung/service/MediaServiceMockedMapperUnitTest.java
@@ -0,0 +1,32 @@
+package com.baeldung.service;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.Test;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+import com.baeldung.mapper.MediaMapper;
+
+public class MediaServiceMockedMapperUnitTest {
+
+    @Test
+    public void whenMockedMapperIsUsed_thenMockedValuesAreMapped() {
+        MediaMapper mockMediaMapper = mock(MediaMapper.class);
+        Media mockedMedia = new Media(5L, "Title 5");
+        when(mockMediaMapper.toEntity(any())).thenReturn(mockedMedia);
+
+        MediaService mediaService = new MediaService(mockMediaMapper);
+        MediaDto mediaDto = new MediaDto(1L, "title 1");
+        Media persisted = mediaService.persistMedia(mediaDto);
+
+        verify(mockMediaMapper).toEntity(mediaDto);
+        assertEquals(mockedMedia.getId(), persisted.getId());
+        assertEquals(mockedMedia.getTitle(), persisted.getTitle());
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/spring/Config.java b/mapstruct-2/src/test/java/com/baeldung/spring/Config.java
@@ -0,0 +1,17 @@
+package com.baeldung.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.baeldung.mapper.MediaMapper;
+import com.baeldung.service.MediaService;
+
+@Configuration
+public class Config {
+
+    @Bean
+    public MediaService mediaService(MediaMapper mediaMapper) {
+        return new MediaService(mediaMapper);
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/spring/MediaServiceSpringGeneratedMapperUnitTest.java b/mapstruct-2/src/test/java/com/baeldung/spring/MediaServiceSpringGeneratedMapperUnitTest.java
@@ -0,0 +1,30 @@
+package com.baeldung.spring;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+import com.baeldung.service.MediaService;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = { Config.class, MediaSpringMapperImpl.class })
+public class MediaServiceSpringGeneratedMapperUnitTest {
+
+    @Autowired
+    MediaService mediaService;
+
+    @Test
+    public void whenGeneratedSpringMapperIsUsed_thenActualValuesAreMapped() {
+        MediaDto mediaDto = new MediaDto(1L, "title 1");
+        Media persisted = mediaService.persistMedia(mediaDto);
+        assertEquals(mediaDto.getId(), persisted.getId());
+        assertEquals(mediaDto.getTitle(), persisted.getTitle());
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/spring/MediaServiceSpringMockedMapperUnitTest.java b/mapstruct-2/src/test/java/com/baeldung/spring/MediaServiceSpringMockedMapperUnitTest.java
@@ -0,0 +1,42 @@
+package com.baeldung.spring;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentMatchers;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.dto.MediaDto;
+import com.baeldung.entity.Media;
+import com.baeldung.service.MediaService;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = Config.class)
+public class MediaServiceSpringMockedMapperUnitTest {
+
+    @Autowired
+    MediaService mediaService;
+
+    @MockitoBean
+    MediaSpringMapper mockMediaMapper;
+
+    @Test
+    public void whenMockedSpringMapperIsUsed_thenMockedValuesAreMapped() {
+        Media mockedMedia = new Media(12L, "title 12");
+        when(mockMediaMapper.toEntity(ArgumentMatchers.any())).thenReturn(mockedMedia);
+
+        MediaDto mediaDto = new MediaDto(1L, "title 1");
+        Media persisted = mediaService.persistMedia(mediaDto);
+
+        verify(mockMediaMapper).toEntity(mediaDto);
+        assertEquals(mockedMedia.getId(), persisted.getId());
+        assertEquals(mockedMedia.getTitle(), persisted.getTitle());
+    }
+
+}
diff --git a/mapstruct-2/src/test/java/com/baeldung/spring/MediaSpringMapper.java b/mapstruct-2/src/test/java/com/baeldung/spring/MediaSpringMapper.java
@@ -0,0 +1,10 @@
+package com.baeldung.spring;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingConstants;
+
+import com.baeldung.mapper.MediaMapper;
+
+@Mapper(componentModel = MappingConstants.ComponentModel.SPRING)
+public interface MediaSpringMapper extends MediaMapper {
+}