Test containers with Spring Boot

application-test.yaml

spring:
  jpa:
    hibernate:
      dialect: org.hibernate.dialect.Postgres95Dialect
      ddl-auto: none
      show-sql: true

  datasource:
    url: ${DB_URL}
    username: ${DB_USERNAME}
    password: ${DB_PASSWORD}
    schema: classpath:db/schema/schema-postgresql.sql
    initialization-mode: always

  liquibase:
    drop-first: true

DatabaseContainerExtension.java

package acme.testcontainers;

import org.junit.jupiter.api.extension.BeforeAllCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.testcontainers.containers.PostgreSQLContainer;
import org.testcontainers.junit.jupiter.Testcontainers;

@Testcontainers
public class DatabaseContainerExtension implements BeforeAllCallback {
    private final PostgreSQLContainer postgreSQLContainer = SharedPostgreSQLContainer.getInstance();

    @Override
    public void beforeAll(ExtensionContext extensionContext) throws Exception {
        postgreSQLContainer.start();
    }
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">


  <!-- ... -->
  
  <dependencies>
    <!-- ... -->
        <dependency>
            <groupId>org.testcontainers</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>1.11.3</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.testcontainers</groupId>
            <artifactId>postgresql</artifactId>
            <version>1.11.3</version>
            <scope>test</scope>
        </dependency>
  </dependencies>
  
  <!-- ... -->
</project>

RepostitoryTest.java

package acme.repository;

import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ActiveProfiles;
import acme.testcontainers.DatabaseContainerExtension;

import javax.validation.OverridesAttribute;
import java.lang.annotation.*;

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@ExtendWith(DatabaseContainerExtension.class)
@Documented
@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@Tag("slow")
public @interface RepositoryTest {
    @OverridesAttribute(constraint = SpringBootTest.class, name = "properties")
    String[] properties() default {"spring.main.banner-mode=off"};
}

SharedPostgreSQLlContainer.java

package acme.testcontainers;

import org.testcontainers.containers.PostgreSQLContainer;

public class SharedPostgreSQLContainer extends PostgreSQLContainer<SharedPostgreSQLContainer> {
    private static final String IMAGE_VERSION = "postgres:9.6";
    private static SharedPostgreSQLContainer container;

    private SharedPostgreSQLContainer() {
        super(IMAGE_VERSION);
    }

    public static SharedPostgreSQLContainer getInstance() {
        if (container == null) {
            container = new SharedPostgreSQLContainer();
        }
        return container;
    }

    @Override
    public void start() {
        super.start();
        System.setProperty("DB_URL", container.getJdbcUrl());
        System.setProperty("DB_USERNAME", container.getUsername());
        System.setProperty("DB_PASSWORD", container.getPassword());
    }

    @Override
    public void stop() {
        // do nothing, the JVM handles shut down
    }
}