ReddRadar
Agent skill
springboot-tdd
Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.
Install this agent skill to your Project
npx add-skill https://github.com/affaan-m/everything-claude-code/tree/main/docs/ja-JP/skills/springboot-tdd
SKILL.md
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
- テストを最初に書く（失敗すべき）
- テストを通すための最小限のコードを実装
- テストをグリーンに保ちながらリファクタリング
- カバレッジを強制（JaCoCo）
ユニットテスト（JUnit 5 + Mockito）
@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）
@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）
@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）
@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:
<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
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。
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