Signelton Abstract Integration Test to reuse a Testcontainer between test classes

AbstractIntegrationTest.java

package dev.aleixmorgadas;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
import org.springframework.test.web.servlet.MockMvc;
import org.testcontainers.containers.PostgreSQLContainer;
import org.testcontainers.junit.jupiter.Testcontainers;

@Testcontainers
@SpringBootTest
@AutoConfigureMockMvc
public abstract class AbstractIntegrationTest {
    @Autowired
    protected MockMvc mockMvc;

    @ServiceConnection
    static final PostgreSQLContainer<?> postgresContainer = new PostgreSQLContainer<>("postgres:16.0");

    static {
        postgresContainer.start();
    }
}