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Kartik Dhiman e4fc57f204 feat: add spring-boot-testing skill for Spring Boot 4.0 (#1085 )

- Introduced MockMvcTester for AssertJ-style assertions in Spring MVC testing.
- Added @RestClientTest for testing REST clients with MockRestServiceServer.
- Implemented RestTestClient as a modern alternative to TestRestTemplate.
- Documented migration steps from Spring Boot 3.x to 4.0, including dependency and annotation changes.
- Created an overview of test slices to guide testing strategies.
- Included Testcontainers setup for JDBC testing with PostgreSQL and MySQL.
- Enhanced @WebMvcTest documentation with examples for various HTTP methods and validation.

2026-03-20 10:24:37 +11:00

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Testcontainers JDBC

Testing JPA repositories with real databases using Testcontainers.

Overview

Testcontainers provides real database instances in Docker containers for integration testing. More reliable than H2 for production parity.

PostgreSQL Setup

Dependencies

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-testcontainers</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.testcontainers</groupId>
  <artifactId>testcontainers-postgresql</artifactId>
  <scope>test</scope>
</dependency>

Basic Test

@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@Testcontainers
class OrderRepositoryPostgresTest {
  
  @Container
  @ServiceConnection
  static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18");
  
  @Autowired
  private OrderRepository orderRepository;
  
  @Autowired
  private TestEntityManager entityManager;
}

MySQL Setup

<dependency>
  <groupId>org.testcontainers</groupId>
  <artifactId>testcontainers-mysql</artifactId>
  <scope>test</scope>
</dependency>

@Container
@ServiceConnection
static MySQLContainer<?> mysql = new MySQLContainer<>("mysql:8.4");

Multiple Databases

@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@Testcontainers
class MultiDatabaseTest {
  
  @Container
  @ServiceConnection(name = "primary")
  static PostgreSQLContainer<?> primaryDb = new PostgreSQLContainer<>("postgres:18");
  
  @Container
  @ServiceConnection(name = "analytics")
  static PostgreSQLContainer<?> analyticsDb = new PostgreSQLContainer<>("postgres:18");
}

Container Reuse (Speed Optimization)

Add to ~/.testcontainers.properties:

testcontainers.reuse.enable=true

Then enable reuse in code:

@Container
@ServiceConnection
static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18")
  .withReuse(true);

Database Initialization

With SQL Scripts

@Container
@ServiceConnection
static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18")
  .withInitScript("schema.sql");

With Flyway

@SpringBootTest
@Testcontainers
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
class MigrationTest {
  
  @Container
  @ServiceConnection
  static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18");
  
  @Autowired
  private Flyway flyway;
  
  @Test
  void shouldApplyMigrations() {
    flyway.migrate();
    // Test code
  }
}

Advanced Configuration

Custom Database/Schema

@Container
@ServiceConnection
static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18")
  .withDatabaseName("testdb")
  .withUsername("testuser")
  .withPassword("testpass")
  .withInitScript("init-schema.sql");

Wait Strategies

@Container
static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18")
  .waitingFor(Wait.forLogMessage(".*database system is ready.*", 1));

Test Example

@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@Testcontainers
class OrderRepositoryTest {
  
  @Container
  @ServiceConnection
  static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18");
  
  @Autowired
  private OrderRepository orderRepository;
  
  @Autowired
  private TestEntityManager entityManager;
  
  @Test
  void shouldFindOrdersByStatus() {
    // Given
    entityManager.persist(new Order("PENDING"));
    entityManager.persist(new Order("COMPLETED"));
    entityManager.flush();
    
    // When
    List<Order> pending = orderRepository.findByStatus("PENDING");
    
    // Then
    assertThat(pending).hasSize(1);
    assertThat(pending.get(0).getStatus()).isEqualTo("PENDING");
  }
  
  @Test
  void shouldSupportPostgresSpecificFeatures() {
    // Can use Postgres-specific features like:
    // - JSONB columns
    // - Array types
    // - Full-text search
  }
}

@DynamicPropertySource Alternative

If not using @ServiceConnection:

@SpringBootTest
@Testcontainers
class OrderServiceTest {
  
  @Container
  static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:18");
  
  @DynamicPropertySource
  static void configureProperties(DynamicPropertyRegistry registry) {
    registry.add("spring.datasource.url", postgres::getJdbcUrl);
    registry.add("spring.datasource.username", postgres::getUsername);
    registry.add("spring.datasource.password", postgres::getPassword);
  }
}

Supported Databases

Database	Container Class	Maven Artifact
PostgreSQL	PostgreSQLContainer	testcontainers-postgresql
MySQL	MySQLContainer	testcontainers-mysql
MariaDB	MariaDBContainer	testcontainers-mariadb
SQL Server	MSSQLServerContainer	testcontainers-mssqlserver
Oracle	OracleContainer	testcontainers-oracle-free
MongoDB	MongoDBContainer	testcontainers-mongodb

Best Practices

Use @ServiceConnection when possible (Spring Boot 3.1+)
Enable container reuse for faster local builds
Use specific versions (postgres:18) not latest
Keep container config in static field
Use @DataJpaTest with AutoConfigureTestDatabase.Replace.NONE

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