how to override an application property programatically in Quarkus - quarkus

Question

I've recently started using testcontantainers for unit/integration testing database operations in my Quarkus webapp. It works fine except I cannot figure out a way to dynamically set the MySQL port in the quarkus.datasource.url application property. Currently I'm using the deprecated withPortBindings method to force the containers to bind the exposed MySQL port to port 11111 but the right way is to let testcontainers pick a random one and override the quarkus.datasource.url property.
My unit test class
#Testcontainers
#QuarkusTest
public class UserServiceTest {
#Container
private static final MySQLContainer MY_SQL_CONTAINER = (MySQLContainer) new MySQLContainer()
.withDatabaseName("userServiceDb")
.withUsername("foo")
.withPassword("bar")
.withUrlParam("serverTimezone", "UTC")
.withExposedPorts(3306)
.withCreateContainerCmdModifier(cmd ->
((CreateContainerCmd) cmd).withHostName("localhost")
.withPortBindings(new PortBinding(Ports.Binding.bindPort(11111), new ExposedPort(3306))) // deprecated, let testcontainers pick random free port
);
#BeforeAll
public static void setup() {
// TODO: use the return value from MY_SQL_CONTAINER.getJdbcUrl()
// to set %test.quarkus.datasource.url
LOGGER.info(" ********************** jdbc url = {}", MY_SQL_CONTAINER.getJdbcUrl());
}
// snip...
}
my application.properties:
%test.quarkus.datasource.url=jdbc:mysql://localhost:11111/userServiceDb?serverTimezone=UTC
%test.quarkus.datasource.driver=com.mysql.cj.jdbc.Driver
%test.quarkus.datasource.username=foo
%test.quarkus.datasource.password=bar
%test.quarkus.hibernate-orm.dialect=org.hibernate.dialect.MySQL8Dialect
The Quarkus guide to configuring an app describes how to programmatically read an application property:
String databaseName = ConfigProvider.getConfig().getValue("database.name", String.class);
but not how to set it. This tutorial on using test containers with Quarkus implicates it should be possible:
// Below should not be used - Function is deprecated and for simplicity of test , You should override your properties at runtime
SOLUTION:
As suggested in the accepted answer, I don't have to specify host and port in the datasource property. So the solution is to simply replace the two lines in application.properties:
%test.quarkus.datasource.url=jdbc:mysql://localhost:11111/userServiceDb
%test.quarkus.datasource.driver=com.mysql.cj.jdbc.Driver
with
%test.quarkus.datasource.url=jdbc:tc:mysql:///userServiceDb
%test.quarkus.datasource.driver=org.testcontainers.jdbc.ContainerDatabaseDriver
(and remove the unnecessary withExposedPorts and withCreateContainerCmdModifier method calls)

Answer 1

Please read the documentation carefully. The port can be omitted.
https://www.testcontainers.org/modules/databases/jdbc/

Answer 2

now (quarkus version 19.03.12) it can be a bit simpler.
Define test component that starts container and overrides JDBC props
import io.quarkus.test.common.QuarkusTestResourceLifecycleManager;
import org.testcontainers.containers.PostgreSQLContainer;
public class PostgresDatabaseResource implements QuarkusTestResourceLifecycleManager {
public static final PostgreSQLContainer<?> DATABASE = new PostgreSQLContainer<>("postgres:10.5")
.withDatabaseName("test_db")
.withUsername("test_user")
.withPassword("test_password")
.withExposedPorts(5432);
#Override
public Map<String, String> start() {
DATABASE.start();
return Map.of(
"quarkus.datasource.jdbc.url", DATABASE.getJdbcUrl(),
"quarkus.datasource.db-kind", "postgresql",
"quarkus.datasource.username", DATABASE.getUsername(),
"quarkus.datasource.password", DATABASE.getPassword());
}
#Override
public void stop() {
DATABASE.stop();
}
}
use it in test
import io.quarkus.test.common.QuarkusTestResource;
import io.quarkus.test.junit.QuarkusTest;
import org.junit.jupiter.api.Test;
import javax.ws.rs.core.MediaType;
import java.util.UUID;
import java.util.stream.Collectors;
import static io.restassured.RestAssured.given;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.*;
#QuarkusTest
#QuarkusTestResource(PostgresDatabaseResource.class)
public class MyControllerTest {
#Test
public void myAwesomeControllerTestWithDb() {
// whatever you want to test here. Quarkus will use Container DB
given().contentType(MediaType.APPLICATION_JSON).body(blaBla)
.when().post("/create-some-stuff").then()
.statusCode(200).and()
.extract()
.body()
.as(YourBean.class);
}