<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
</dependency>

@RestController
public class GenericEntityController{
 private List<GenericEntity> entityList = new ArrayList<>();
 @RequestMapping("/entity/all")
 public List<GenericEntity> findAll(){
  return entityList;
 }
 @RequestMapping(value = "/entity", method = RequestMethod.POST)
 public GenericEntity addEntity(GenericEntity entity){
  entityList.add(entity);
  return entity;
 }
 @RequestMapping("/entity/findby/{id}")
 public GenericEntity findById(@PathVariable Long id){
  return entityList.stream().
     filter(entity -> entity.getId().equals(id)).
     findFirst().get();
 }
}

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-test</artifactId>
 <scope>test</scope>
</dependency>

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
@WebAppConfiguration
public class SpringBootApplicationTest{
 @Autowired
 private WebApplicationContext webApplicationContext;
 private MockMvc mockMvc;
 @Before
 public void setupMockMvc(){
  mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
 }
 @Test
 public void givenRequestHasBeenMade_whenMeetsAllOfGivenConditions_thenCorrect()
  throws Exception { 
  MediaType contentType = new MediaType(MediaType.APPLICATION_JSON.getType(),
  MediaType.APPLICATION_JSON.getSubtype(), Charset.forName("utf8"));
  mockMvc.perform(MockMvcRequestBuilders.get("/entity/all")).
  andExpect(MockMvcResultMatchers.status().isOk()).
  andExpect(MockMvcResultMatchers.content().contentType(contentType)).
  andExpect(jsonPath("$", hasSize(4))); 
 } 
}

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
 <groupId>com.h2database</groupId>
 <artifactId>h2</artifactId>
 <scope>runtime</scope>
</dependency>

public interface GenericEntityRepositoryextends JpaRepository<GenericEntity,Long>{}

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
public class SpringBootJPATest{
 @Autowired
 private GenericEntityRepository genericEntityRepository;
 
 @Test
 public void givenGenericEntityRepository_whenSaveAndRetreiveEntity_thenOK(){
  GenericEntity genericEntity = 
   genericEntityRepository.save(new GenericEntity("test"));
  GenericEntity foundedEntity = 
   genericEntityRepository.findOne(genericEntity.getId());
   
  assertNotNull(foundedEntity);
  assertEquals(genericEntity.getValue(), foundedEntity.getValue());
 }
}

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

<dependency>
 <groupId>org.subethamail</groupId>
 <artifactId>subethasmtp</artifactId>
 <version>3.1.7</version>
 <scope>test</scope>
</dependency>

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
public class SpringBootMailTest{
 @Autowired
 private JavaMailSender javaMailSender;
 private Wiser wiser;
 private String userTo = "user2@localhost";
 private String userFrom = "user1@localhost";
 private String subject = "Test subject";
 private String textMail = "Text subject mail";
 @Before
 public void setUp()throws Exception {
  final int TEST_PORT = 25;
  wiser = new Wiser(TEST_PORT);
  wiser.start();
 }
 @After
 public void tearDown()throws Exception {
  wiser.stop();
 }
 @Test
 public void givenMail_whenSendAndReceived_thenCorrect()throws Exception {
  SimpleMailMessage message = composeEmailMessage();
  javaMailSender.send(message);
  List<WiserMessage> messages = wiser.getMessages();
  assertThat(messages, hasSize(1));
  WiserMessage wiserMessage = messages.get(0);
  assertEquals(userFrom, wiserMessage.getEnvelopeSender());
  assertEquals(userTo, wiserMessage.getEnvelopeReceiver());
  assertEquals(subject, getSubject(wiserMessage));
  assertEquals(textMail, getMessage(wiserMessage));
 }
 private String getMessage(WiserMessage wiserMessage)
  throws MessagingException, IOException {
  return wiserMessage.getMimeMessage().getContent().toString().trim();
 }
 private String getSubject(WiserMessage wiserMessage)throws MessagingException {
  return wiserMessage.getMimeMessage().getSubject();
 }
 private SimpleMailMessage composeEmailMessage(){
  SimpleMailMessage mailMessage = new SimpleMailMessage();
  mailMessage.setTo(userTo);
  mailMessage.setReplyTo(userFrom);
  mailMessage.setFrom(userFrom);
  mailMessage.setSubject(subject);
  mailMessage.setText(textMail);
  return mailMessage;
 }
}

spring.mail.host=localhost
spring.mail.port=25
spring.mail.properties.mail.smtp.auth=false