Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.
Scanned 9/4/2026
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---
name: springboot-tdd
description: Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.
origin: ECC
---
# Spring Boot TDD İş Akışı
80%+ kapsam (unit + integration) ile Spring Boot servisleri için TDD rehberi.
## Ne Zaman Kullanılır
- Yeni özellikler veya endpoint'ler
- Bug düzeltmeleri veya refactoring'ler
- Veri erişim mantığı veya güvenlik kuralları ekleme
## İş Akışı
1) Önce testleri yazın (başarısız olmalılar)
2) Geçmek için minimal kod uygulayın
3) Testleri yeşil tutarken refactor edin
4) Kapsamı zorlayın (JaCoCo)
## Unit Testler (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());
}
}
```
Desenler:
- Arrange-Act-Assert
- Kısmi mock'lardan kaçının; açık stubbing tercih edin
- Varyantlar için `@ParameterizedTest` kullanın
## Web Katmanı Testleri (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());
}
}
```
## Entegrasyon Testleri (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());
}
}
```
## Persistence Testleri (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();
}
}
```
## Testcontainers
- Production'ı yansıtmak için Postgres/Redis için yeniden kullanılabilir container'lar kullanın
- JDBC URL'lerini Spring context'e enjekte etmek için `@DynamicPropertySource` ile bağlayın
## Kapsam (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>
```
## Assertion'lar
- Okunabilirlik için AssertJ'yi (`assertThat`) tercih edin
- JSON yanıtları için `jsonPath` kullanın
- Exception'lar için: `assertThatThrownBy(...)`
## Test Veri Builder'ları
```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); }
}
```
## CI Komutları
- Maven: `mvn -T 4 test` veya `mvn verify`
- Gradle: `./gradlew test jacocoTestReport`
**Unutmayın**: Testleri hızlı, izole ve deterministik tutun. Uygulama detaylarını değil, davranışı test edin.
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