Better way to set testcontainer properties from default applicaton.yml in springboottest - spring-boot

Question

I am using posgresql testcontainer in springboottest. As I have multiple tests involving this testcontainer, hence I have used static testcontainer which will be invoked once for all tests of 1 junit class and shutdown after all tests are executed.
This I have implemented using ParameterResolver, BeforeEachCallback.
Problem with this approach is that datasource metadata like jdbc-url, db name , host , port configured in default application.yml is not used directly in testcontainer properties, instead I have hardcoded those values because springboot properties are not available at that time.
is there any better approach where I can use static testcontainers having BeforeEachCallback feature whose values are fetched from default application.yml ?
#SpringBootTest
class SampleTest extends TestContainerBase {
#Test
void test1() {
//some code
}
}
#ExtendWith(ContainerExtension.class)
#ResourceLock(Environment.ID)
public abstract class TestContainerBase {
protected static String jdbcUrl;
protected static String username;
protected static String password;
#BeforeAll
static void prepareContainerEnvironment(Environment env) {
jdbcUrl = env.getJdbcUrl();
username = env.getUsername();
password = env.getPassword();
}
#DynamicPropertySource
static void dynamicPropertySource(DynamicPropertyRegistry registry) {
registry.add("spring.datasource-.jdbc-url", () -> jdbcUrl);
registry.add("spring.datasource-.username", () -> username);
registry.add("spring.datasource-.password", () -> password);
registry.add("spring.datasource-.driver-class-name", () -> "org.postgresql.Driver");
}
}
public class ContainerExtension implements ParameterResolver, BeforeEachCallback {
// overridden supportsParameter and resolveParameter
}
I want that myDB , sa , sa are read from application.yml. How can I get application.yml values here in this class ? As springboot context is not yet loaded so I am unable to think of any alternative to get those values.
public class ContainerResource extends Environment {
#Container
protected static PostgreSQLContainer postgreSQLContainer =
new PostgreSQLContainer("artifactory.devtools.syd.c1.macquarie.com:9996/postgres:11")
.withDatabaseName("myDB")
.withUsername("username")
.withPassword("password");
ContainerEnvironmentResource() {
postgreSQLContainer.start();
this.setJdbcUrl(postgreSQLContainer.getJdbcUrl());
this.setUsername(postgreSQLContainer.getUsername());
this.setPassword(postgreSQLContainer.getPassword());
}
}

Answer 1

It looks like there is now a dedicated project just to integrate Testcontainers and Spring-Boot. As I understand the documentation it should be transparent to the code as everything is done using Spring magic.
https://github.com/Playtika/testcontainers-spring-boot