---
name: springboot-tdd-b7dbe8dcbafe
description: Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.
---

# Spring Boot TDD ワークフロー

80%以上のカバレッジ（ユニット+統合）を持つSpring Bootサービスのためのテスト駆動開発ガイダンス。

## いつ使用するか

- 新機能やエンドポイント
- バグ修正やリファクタリング
- データアクセスロジックやセキュリティルールの追加

## ワークフロー

1) テストを最初に書く（失敗すべき）
2) テストを通すための最小限のコードを実装
3) テストをグリーンに保ちながらリファクタリング
4) カバレッジを強制（JaCoCo）

## ユニットテスト（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());
  }
}
```

パターン:
- Arrange-Act-Assert
- 部分モックを避ける。明示的なスタビングを優先
- バリエーションに`@ParameterizedTest`を使用

## Webレイヤーテスト（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());
  }
}
```

## 統合テスト（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());
  }
}
```

## 永続化テスト（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

- 本番環境を反映するためにPostgres/Redis用の再利用可能なコンテナを使用
- `@DynamicPropertySource`経由でJDBC URLをSpringコンテキストに注入

## カバレッジ（JaCoCo）

Mavenスニペット:
```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>
```

## アサーション

- 可読性のためにAssertJ（`assertThat`）を優先
- JSONレスポンスには`jsonPath`を使用
- 例外には: `assertThatThrownBy(...)`

## テストデータビルダー

```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コマンド

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

**覚えておいてください**: テストは高速で、分離され、決定論的に保ちます。実装の詳細ではなく、動作をテストします。


---
Source attribution: affaan-m
Original project: https://github.com/affaan-m/everything-claude-code/blob/25278e7d7b6cf6e6a4e7a6c8e10f14ff22f0eb5b/docs/ja-JP/skills/springboot-tdd/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Affaan Mustafa

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: affaan-m
Original project: https://github.com/affaan-m/everything-claude-code/blob/25278e7d7b6cf6e6a4e7a6c8e10f14ff22f0eb5b/docs/ja-JP/skills/springboot-tdd/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering
Roles: Backend Developer, DevOps / SRE, QA / Test Engineer
Specialties: Backend, Testing
Tools: Jacoco, Mockmvc, Mockito, Testcontainers, Junit 5
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 293b2ec18e62b9e24c5a8f2228d978354b81e363352dafe36c4e9cfff80e4f45