Keycloak Testcontainer

A Testcontainers implementation for Keycloak SSO.

How to use

The @Container annotation used here in the readme is from the JUnit 5 support of Testcontainers. Please refer to the Testcontainers documentation for more information.

Simply spin up a default Keycloak instance:

@Container
private KeycloakContainer keycloak = new KeycloakContainer();

Use another Keycloak Docker image/version than used in this Testcontainer:

@Container
private KeycloakContainer keycloak = new KeycloakContainer("jboss/keycloak:12.0.1");

Power up a Keycloak instance with an existing realm JSON config file (from classpath):

@Container
private KeycloakContainer keycloak = new KeycloakContainer()
    .withRealmImportFile("test-realm.json");

Use different admin credentials than the defaut internal (admin/admin) ones:

@Container
private KeycloakContainer keycloak = new KeycloakContainer()
    .withAdminUsername("myKeycloakAdminUser")
    .withAdminPassword("tops3cr3t");

You can obtain several properties form the Keycloak container:

String authServerUrl = keycloak.getAuthServerUrl();
String adminUsername = keycloak.getAdminUsername();
String adminPassword = keycloak.getAdminPassword();

with these properties, you can create a org.keycloak.admin.client.Keycloak (Keycloak admin client, 3rd party dependency from Keycloak project) object to connect to the container and do optional further configuration:

Keycloak keycloakAdminClient = KeycloakBuilder.builder()
    .serverUrl(keycloak.getAuthServerUrl())
    .realm("master")
    .clientId("admin-cli")
    .username(keycloak.getAdminUsername())
    .password(keycloak.getAdminPassword())
    .build();

See also KeycloakContainerTest class.

TLS (SSL) Usage

You have several options to use HTTPS/TLS secured communication with your Keycloak Testcontainer.

Default Support

Plain Keycloak comes with a default Java KeyStore (JKS) with an auto-generated, self-signed certificate on first use. You can use this TLS secured connection, although your testcontainer doesn't know of anything TLS-related and returns the HTTP-only url with getAuthServerUrl(). In this case, you have to build the auth-server-url on your own, e.g. like this:

String authServerUrl = "https://localhost:" + keycloak.getHttpsPort() + "/auth";

See also KeycloakContainerHttpsTest.shouldStartKeycloakWithDefaultTlsSupport.

Built-in TLS Cert and Key

This Keycloak Testcontainer comes with built-in TLS certificate (tls.crt), key (tls.key) and Java KeyStore (tls.jks) files, located in the resources folder. You can use this configuration by only configuring your testcontainer like this:

@Container
private KeycloakContainer keycloak = new KeycloakContainer().useTls();

The password for the provided Java KeyStore file is changeit. See also KeycloakContainerHttpsTest.shouldStartKeycloakWithProvidedTlsCertAndKey.

The method getAuthServerUrl() will then return the HTTPS url.

Custom TLS Cert and Key

Of course you can also provide your own certificate and key file for usage in this Testcontainer:

@Container
private KeycloakContainer keycloak = new KeycloakContainer()
    .useTls("your_custom.crt", "your_custom.key");

See also KeycloakContainerHttpsTest.shouldStartKeycloakWithCustomTlsCertAndKey.

The method getAuthServerUrl() will also return the HTTPS url.

Testing Custom Extensions

To ease extension testing, you can tell the Keycloak Testcontainer to detect extensions in a given classpath folder. This allows to test extensions directly in the same module without a packaging step.

If you have your Keycloak extension code in the src/main/java folder, then the resulting classes will be generated to the target/classes folder. To test your extensions you just need to tell KeycloakContainer to consider extensions from the target/classes folder.

Keycloak Testcontainer will then dynamically generate an exploded "jar file" with the extension code that is then picked up by Keycloak.

private KeycloakContainer keycloak = new KeycloakContainer()
    .withExtensionClassesFrom("target/classes");

Setup

The release versions of this project are available at Maven Central. Simply put the dependency coordinates to your pom.xml (or something similar, if you use e.g. Gradle or something else):

<dependency>
  <groupId>com.github.dasniko</groupId>
  <artifactId>testcontainers-keycloak</artifactId>
  <version>VERSION</version>
  <scope>test</scope>
</dependency>

Usage in your application framework tests

This info is not specific to the Keycloak Testcontainer, but using Testcontainers generally.

I mention it here, as I see people asking again and again on how to use it in their test setup, when they think they need to specify a fixed port in their properties or YAML files...
You don't have to!
But you have to read the Testcontainers docs and the docs of your application framework on testing resources!!

Spring (Boot)

Dynamic context configuration with context initializers is your friend. In particular, look for @ContextConfiguration and ApplicationContextInitializer<ConfigurableApplicationContext>:

• https://docs.spring.io/spring-framework/docs/current/reference/html/testing.html#spring-testing-annotation-contextconfiguration
• https://docs.spring.io/spring-framework/docs/current/reference/html/testing.html#testcontext-ctx-management-initializers

Quarkus

Read the docs about the Quarkus Test Resources and use @QuarkusTestResource with QuarkusTestResourceLifecycleManager

• https://quarkus.io/guides/getting-started-testing#quarkus-test-resource

Others

Consult the docs of your application framework testing capabilities on how to dynamically configure your stack for testing!

Testcontainers & Keycloak version compatiblity

There might also be other possible version configurations which will work.

See also the Releases page for version and feature update notes.

Credits

Many thanks to the creators and maintainers of Testcontainers. You do an awesome job!

Same goes to the whole Keycloak team!

Kudos to @thomasdarimont for some inspiration for this project.

License

MIT License

Copyright (c) 2019-2020 Niko Köbler

See LICENSE file for details.