Springboot Tdd

by affaan-mef648e01899ba3e8dc6371642deaaf64b4477775No license275K starsListed Oct 9, 2026Updated Oct 9, 2026Repository updated 4 days ago

Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.

Instructions onlySoftware Development

AI-generated overview

Guides test-driven development for Spring Boot services using JUnit 5, Mockito, MockMvc, Testcontainers and JaCoCo.

What it does: Provides a TDD workflow for Spring Boot: write failing tests first, implement minimal code, refactor, then enforce coverage with JaCoCo. It supplies example test patterns for unit tests with JUnit 5 and Mockito, web-layer tests with MockMvc, integration tests with SpringBootTest, and persistence tests with DataJpaTest and Testcontainers. It also covers AssertJ assertions, test data builders, and Maven or Gradle CI commands.
When to use it: Use when adding new features or endpoints, fixing bugs, refactoring, or adding data access logic or security rules to a Spring Boot service. It targets teams wanting 80% or higher unit and integration test coverage.
Requirements: Instructions only, no scripts. Assumes a Spring Boot project with JUnit 5, Mockito, MockMvc, Testcontainers and JaCoCo, plus Maven or Gradle; Testcontainers requires a container runtime.

Spring Boot TDD Workflow

TDD guidance for Spring Boot services with 80%+ coverage (unit + integration).

When to Use

New features or endpoints
Bug fixes or refactors
Adding data access logic or security rules

Workflow

Write tests first (they should fail)
Implement minimal code to pass
Refactor with tests green
Enforce coverage (JaCoCo)

Unit Tests (JUnit 5 + Mockito)

java

@ExtendWith(MockitoExtension.class)class MarketServiceTest {  @Mock MarketRepository repo;  @InjectMocks MarketService service;
  @Test  void createsMarket() {    CreateMarketRequest req = new CreateMarketRequest("name", "desc", Instant.now(), List.of("cat"));    when(repo.save(any())).thenAnswer(inv -> inv.getArgument(0));
    Market result = service.create(req);
    assertThat(result.name()).isEqualTo("name");    verify(repo).save(any());  }}

@ExtendWith(MockitoExtension.class)class MarketServiceTest {  @Mock MarketRepository repo;  @InjectMocks MarketService service;
  @Test  void createsMarket() {    CreateMarketRequest req = new CreateMarketRequest("name", "desc", Instant.now(), List.of("cat"));    when(repo.save(any())).thenAnswer(inv -> inv.getArgument(0));
    Market result = service.create(req);
    assertThat(result.name()).isEqualTo("name");    verify(repo).save(any());  }}

Patterns:

Arrange-Act-Assert
Avoid partial mocks; prefer explicit stubbing
Use @ParameterizedTest for variants

Web Layer Tests (MockMvc)

java

@WebMvcTest(MarketController.class)class MarketControllerTest {  @Autowired MockMvc mockMvc;  @MockBean MarketService marketService;
  @Test  void returnsMarkets() throws Exception {    when(marketService.list(any())).thenReturn(Page.empty());
    mockMvc.perform(get("/api/markets"))        .andExpect(status().isOk())        .andExpect(jsonPath("$.content").isArray());  }}

@WebMvcTest(MarketController.class)class MarketControllerTest {  @Autowired MockMvc mockMvc;  @MockBean MarketService marketService;
  @Test  void returnsMarkets() throws Exception {    when(marketService.list(any())).thenReturn(Page.empty());
    mockMvc.perform(get("/api/markets"))        .andExpect(status().isOk())        .andExpect(jsonPath("$.content").isArray());  }}

Integration Tests (SpringBootTest)

java

@SpringBootTest@AutoConfigureMockMvc@ActiveProfiles("test")class MarketIntegrationTest {  @Autowired MockMvc mockMvc;
  @Test  void createsMarket() throws Exception {    mockMvc.perform(post("/api/markets")        .contentType(MediaType.APPLICATION_JSON)        .content("""          {"name":"Test","description":"Desc","endDate":"2030-01-01T00:00:00Z","categories":["general"]}        """))      .andExpect(status().isCreated());  }}

@SpringBootTest@AutoConfigureMockMvc@ActiveProfiles("test")class MarketIntegrationTest {  @Autowired MockMvc mockMvc;
  @Test  void createsMarket() throws Exception {    mockMvc.perform(post("/api/markets")        .contentType(MediaType.APPLICATION_JSON)        .content("""          {"name":"Test","description":"Desc","endDate":"2030-01-01T00:00:00Z","categories":["general"]}        """))      .andExpect(status().isCreated());  }}

Persistence Tests (DataJpaTest)

java

@DataJpaTest@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)@Import(TestContainersConfig.class)class MarketRepositoryTest {  @Autowired MarketRepository repo;
  @Test  void savesAndFinds() {    MarketEntity entity = new MarketEntity();    entity.setName("Test");    repo.save(entity);
    Optional<MarketEntity> found = repo.findByName("Test");    assertThat(found).isPresent();  }}

@DataJpaTest@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)@Import(TestContainersConfig.class)class MarketRepositoryTest {  @Autowired MarketRepository repo;
  @Test  void savesAndFinds() {    MarketEntity entity = new MarketEntity();    entity.setName("Test");    repo.save(entity);
    Optional<MarketEntity> found = repo.findByName("Test");    assertThat(found).isPresent();  }}

Testcontainers

Use reusable containers for Postgres/Redis to mirror production
Wire via @DynamicPropertySource to inject JDBC URLs into Spring context

Coverage (JaCoCo)

Maven snippet:

xml

<plugin>  <groupId>org.jacoco</groupId>  <artifactId>jacoco-maven-plugin</artifactId>  <version>0.8.14</version>  <executions>    <execution>      <goals><goal>prepare-agent</goal></goals>    </execution>    <execution>      <id>report</id>      <phase>verify</phase>      <goals><goal>report</goal></goals>    </execution>  </executions></plugin>

<plugin>  <groupId>org.jacoco</groupId>  <artifactId>jacoco-maven-plugin</artifactId>  <version>0.8.14</version>  <executions>    <execution>      <goals><goal>prepare-agent</goal></goals>    </execution>    <execution>      <id>report</id>      <phase>verify</phase>      <goals><goal>report</goal></goals>    </execution>  </executions></plugin>

Assertions

Prefer AssertJ (assertThat) for readability
For JSON responses, use jsonPath
For exceptions: assertThatThrownBy(...)

Test Data Builders

java

class MarketBuilder {  private String name = "Test";  MarketBuilder withName(String name) { this.name = name; return this; }  Market build() { return new Market(null, name, MarketStatus.ACTIVE); }}

class MarketBuilder {  private String name = "Test";  MarketBuilder withName(String name) { this.name = name; return this; }  Market build() { return new Market(null, name, MarketStatus.ACTIVE); }}

CI Commands

Maven: mvn -T 4 test or mvn verify
Gradle: ./gradlew test jacocoTestReport

Remember: Keep tests fast, isolated, and deterministic. Test behavior, not implementation details.

Source and attribution

Source:affaan-m/ECCinskills/springboot-tddat commitef648e0

License: No license

Content belongs to its original authors. SourceWeft indexes it from a public repository.

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Springboot Tdd

Spring Boot TDD Workflow

When to Use

Workflow

Unit Tests (JUnit 5 + Mockito)

Web Layer Tests (MockMvc)

Integration Tests (SpringBootTest)

Persistence Tests (DataJpaTest)

Testcontainers

Coverage (JaCoCo)

Assertions

Test Data Builders

CI Commands

Source and attribution

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