step-6-adding-redis.md

Step 6: Adding Redis

The simplest way to provide a Redis instance for your tests is to use GenericContainer with a Redis Docker image: https://www.testcontainers.org/usage/generic_containers.html The integration between the tests code and Testcontainers is straightforward.

Rules? No thanks!

Testcontainers comes with first class support for JUnit, but in our app we want to have a single Redis instance shared between all tests. Luckily, there are the .start()/.stop() methods of GenericContainer to start or stop it manually.

Just add the following code to your AbstractIntegrationTest with the following code:

static final GenericContainer redis = new GenericContainer("redis:6-alpine")
                                            .withExposedPorts(6379);

@DynamicPropertySource
public static void configureRedis(DynamicPropertyRegistry registry) {
  redis.start();
  registry.add("spring.redis.host", redis::getHost);
  registry.add("spring.redis.port", redis::getFirstMappedPort);
}

Simple and beautiful, huh?

Run the tests, now they should all pass.