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@Testcontainers
@ExtendWith(SpringExtension.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
@ContextConfiguration(
        initializers = DemoApplicationTests.Initializer.class,
        classes = DemoApplication.class)
@TestPropertySource(locations = {"classpath:application_test.properties"})
class DemoApplicationTests {

    @Test
    void contextLoads() {
    }

    @Container
    public static PostgreSQLContainer postgreSQLContainer = new PostgreSQLContainer("postgres:latest")
            .withDatabaseName("db_demo").withUsername("sa").withPassword("sa");

    @Configuration
    static class Initializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
        @Override
        public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
            TestPropertyValues
                    .of("spring.datasource.url=" + postgreSQLContainer.getJdbcUrl(),
                            "spring.datasource.username=" + postgreSQLContainer.getUsername(),
                            "spring.datasource.password=" + postgreSQLContainer.getPassword())
                    .applyTo(configurableApplicationContext.getEnvironment());
        }
    }

}