1. Testing with Spring Boot
Unit Testing
Testing with Spring Boot
Unit Testing
SoftUni Team
Technical Trainers
Software University

2. Table of Contents Unit Testing Repository Layer Service Layer
Entities (Recap)
Repositories
Service Layer
Web Layer
Controllers

3. Have a Question?
sli.do #JavaWeb

4. Unit Testing

5. What are Unit Tests?
individual units of source code are tested to determine whether they are work as intended.
System Testing
Integration Testing
Unit Testing
Test System
Test Modules
Test Methods

6. Why to Test? More reliable code – due to less bugs
Faster development – no need to constantly debug
Better maintenance – because of a constant code care
Clearer code – code modularity is required to write tests
Cheaper – bugs in production cost more

7. Cost in Different Phases

8. Spring Unit Testing pom.xml <dependency>
JUnit — The de-facto standard for unit testing Java applications.
Spring Test & Spring Boot Test — Utilities and integration test support for Spring Boot applications.
AssertJ — A fluent assertion library.
Hamcrest — A library of matcher objects (also known as constraints or predicates).
Mockito — A Java mocking framework.
JSONassert — An assertion library for JSON.
JsonPath — XPath for JSON.
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

9. Entity Testing

10. Problem 1 How to test? User.java @Entity
public abstract class User implements UserDetails {
public void addRole(Role role){
this.getAuthorities().add(role); }
How to test?

11. Spring Boot Test Utilities
Entity Test (1)
UserTest.java
@RunWith(SpringRunner.class)
public class UserTest {
private User user;
@Mock
private Role role;
@Before
public void setUp() throws Exception {
//Arrange
this.user = new BasicUser();
when(this.role.getAuthority()).thenReturn("ROLE_USER"); } …
Spring Boot Test Utilities

12. Entity Test (2) UserTest.java @RunWith(SpringRunner.class)
public class UserTest {
@Test
public void addRoleWhenRoleExists_ShouldAddRole() throws Exception {
//Act
this.user.addRole(this.role);
//Assert
Role role = this.user.getAuthorities().iterator().next();
assertEquals(role.getAuthority(), "ROLE_USER"); }

13. Repository Testing

14. Problem 2 How to test? BikeRepository.java @Repository
public interface BikeRepository extends JpaRepository<Bike, Long> {
@Query(value = "SELECT b FROM Bike AS b")
List<Bike> findAll(); }
How to test?

15. Repository Test Spring Boot Test Utilities JPA Test
BikeRepositoryTest.java
@RunWith(SpringRunner.class)
= NONE)
public class BikeRepositoryTest {
@Autowired
private TestEntityManager testEntityManager;
private BikeRepository bikeRepository;
@Test
public void findAllShouldReturnCorrectSizeList() throws Exception {
int listSize = 5;
for (int i = 0; i < listSize; i++) {
this.testEntityManager.persist(new Bike()); }
List<Bike> bikes = this.bikeRepository.findAll();
assertEquals(listSize,bikes.size());
JPA Test
Use Standard Database
Repository Alternative

16. Repository Test Database
BikeRepositoryTest.java
@RunWith(SpringRunner.class)
= NONE)
public class BikeRepositoryTest {
@Autowired
private TestEntityManager testEntityManager; }
Should we test in production database?
Test in in-memory database
MySQL
HSQL

17. In-Memory Databases (1)
application.properties
spring.profiles.active=dev
application-dev.properties
#Dev Data Source Properties
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/social_demo?useSSL=false&createDatabaseIfNotExist=true
spring.datasource.username=root
spring.datasource.password=1234

18. In-Memory Databases (2)
application-test.properties
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.database=HSQL
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.HSQLDialect
spring.datasource.driverClassName=org.hsqldb.jdbcDriver
spring.datasource.url=jdbc:hsqldb:mem:social
spring.datasource.username=sa
spring.datasource.password=

19. In-Memory Databases (3)
pom.xml
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>test</scope>
</dependency>

20. In-Memory Databases (4)
BikeRepositoryTest.java
@RunWith(SpringRunner.class)
public class BikeRepositoryTest {
@Autowired
private TestEntityManager testEntityManager; }
Test Profile

21. Exercise: Test User and Bike Repository

22. Service Testing

23. Problem 3 How to test? BikeService.java public interface BikeService {
BikeViewModel findById(long id);
List<BikeViewModel> findAll();
Page<BikeViewModel> findAll(Pageable pageable); }
How to test?

24. Service Testing (1) Inject in Service Mock a Bean Autowire Service
BikeService.java
@RunWith(SpringRunner.class)
@SpringBootTest
@ActiveProfiles("test")
public class BikeServiceTest {
@Autowired
private ModelMapper modelMapper;
@MockBean
private BikeRepository bikeRepository;
private BikeService bikeService;
Inject in Service
Mock a Bean
Autowire Service

25. Service Testing (2) BikeService.java @Before
public void setUp() throws Exception { Bike bike = new Bike();
bike.setId(1);
bike.setModel("BMX");
when(bikeRepository.findOne(1L)).thenReturn(bike); }
@Test
public void wheUserIdIsProvided_ShouldReturnCorrectModel() throws Exception {
BikeViewModel bikeViewModel = this.bikeService.findById(1);
assertEquals(bikeViewModel.getModel(),"BMX");

26. Exercise: SocialUser Service

27. Web Layer Testing

28. Problem 4 How to test? BikeService.java
@GetMapping("/bikes/show/{id}")
public String showBike(Model long id){
BikeViewModel bikeViewModel = this.bikeService.findById(id);
model.addAttribute("bike", bikeViewModel);
return "bike-show"; }
How to test?

29. Disable Security for Tests
application-test.properties …
security.basic.enabled=false
Disable Security?

30. Pagination Support (Optional)
Controller Testing (1)
BikeControllerTest.java
@RunWith(SpringRunner.class)
@WebMvcTest(BikeController.class)
@ActiveProfiles("test")
@EnableSpringDataWebSupport
public class BikeControllerTest {
@Autowired
private MockMvc mvc;
@MockBean
private BikeService bikeService;
@Before
public void setUp() throws Exception {
BikeViewModel bike = new BikeViewModel();
bike.setId(1);
bike.setModel("BMX");
when(bikeService.findById(1)).thenReturn(bike); }
Controller Test
Pagination Support (Optional)

31. Controller Testing (2) HTTP Status View Test Model Test
BikeControllerTest.java
@Test
public void showBikeWhenBikeExists_ShouldReturnViewAndModel() throws Exception {
this.mvc.perform(
get("/bikes/show/1"))
.andExpect(status().isOk())
.andExpect(view().name("bike-show"))
.andExpect(model().attribute("bike", hasProperty("id", is(1L))))
.andExpect(model().attribute("bike", hasProperty("model", is("BMX"))))
.andExpect(model().attribute("bike", hasProperty("gears", is(24)))); }
HTTP Status
View Test
Model Test

32. Controller Testing Exception Handling
BikeControllerTest.java
@Test
public void showBikeWhenBikeNotExists_ShouldReturnNotFound() throws Exception {
this.mvc.perform(get("/bikes/show/2"))
.andExpect(status().is4xxClientError())
.andExpect(view().name("exceptions/bike-not-found")); }
HTTP Status
View Test

33. Summary
Unit Testing – critical part of the development process that ensures our application works as expected

34. Web Development Basics – Course Overview
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35. License
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This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike license.

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