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Springboot Tdd

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使用 JUnit 5、Mockito、MockMvc、Testcontainers 和 JaCoCo 进行 Spring Boot 的测试驱动开发(TDD)。在添加功能、修复 Bug 或进行重构时使用。

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  • Added February 7, 2026
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  • api

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A100/100

Scanned February 12, 2026

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SKILL.md
---
name: springboot-tdd
description: 使用 JUnit 5、Mockito、MockMvc、Testcontainers 和 JaCoCo 进行 Spring Boot 的测试驱动开发(TDD)。在添加功能、修复 Bug 或进行重构时使用。
---

# Spring Boot 测试驱动开发(TDD)工作流

针对 Spring Boot 服务的 TDD 指南,要求 80% 以上的覆盖率(单元测试 + 集成测试)。

## 适用场景

- 开发新功能或端点(Endpoints)
- 修复 Bug 或进行代码重构
- 添加数据访问逻辑或安全规则

## 工作流

1) 先写测试(测试应当失败)
2) 实现最少量的代码以使测试通过
3) 在测试通过(Green)的前提下进行重构
4) 强制执行覆盖率检查(JaCoCo)

## 单元测试(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());
  }
}
```

模式:
- Arrange-Act-Assert(准备-执行-断言)
- 避免部分打桩(Partial Mocks);优先使用显式桩函数(Stubbing)
- 使用 `@ParameterizedTest` 处理多种变体场景

## Web 层测试(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());
  }
}
```

## 集成测试(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());
  }
}
```

## 持久层测试(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

- 使用可重用的容器(如 Postgres/Redis)来模拟生产环境
- 通过 `@DynamicPropertySource` 进行连接,将 JDBC URL 注入到 Spring 上下文中

## 覆盖率(JaCoCo)

Maven 配置片段:
```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>
```

## 断言(Assertions)

- 为了提高可读性,优先选择 AssertJ (`assertThat`)
- 对于 JSON 响应,使用 `jsonPath`
- 对于异常测试:`assertThatThrownBy(...)`

## 测试数据构建器(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); }
}
```

## CI 命令

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

**记住**:保持测试快速、隔离且具有确定性。测试的是行为,而非实现细节。

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