ActiveProfiles("test")
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@ContextConfiguration(initializers = AbstractIT.DockerPostgreDataSourceInitializer.class)
@Testcontainers
public abstract class AbstractIT {
    

    @SuppressWarnings("resource")
    @Container
    static PostgreSQLContainer<?> postgreSQLContainer = new PostgreSQLContainer<>("postgres:14")
            .withUsername("postgres")
            .withPassword("postgres")
            .withInitScript("sql/init.sql")
            .withDatabaseName("test")
            .withReuse(true);
    
    static {
        postgreDBContainer.start();
    }
    
    public static class DockerPostgreDataSourceInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
        
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
            
            TestPropertySourceUtils.addInlinedPropertiesToEnvironment(
                    applicationContext,
                    "spring.datasource.url=" + postgreDBContainer.getJdbcUrl(),
                    "spring.datasource.username=" + postgreDBContainer.getUsername(),
                    "spring.datasource.password=" + postgreDBContainer.getPassword()
            );
        }
    }
}

SqlExceptionHelper : HikariPool-1 – Connection is not available, request timed out after 30000ms.
o.h.engine.jdbc.spi.SqlExceptionHelper : Connection to localhost:49168 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

I created one instance of Textcontainers, I have a lot of integration tests, but only one test class is working, the rest cannot. because the connection is being closed.

Installing @DirtiesContext and changing the open connection interval does not solve the problem.

Decision.

delete an annotation @Container.

 static PostgreSQLContainer<?> postgreSQLContainer = new PostgreSQLContainer<> ......