Testcontainers: Synchronizing on Logs after the Service Was Ready

I'm developing some component tests using Testcontainers. I can synchronize the tests on service readiness. However, once the service is ready, I need to prepare the fixture and run the tests until the fixture is fully loaded.

The container under test writes a log that I could use to understand when the fixture is fully loaded. However, I cannot find a method to synchronize on that log.

Does the Testcontainers library offer any utility for this?

2 Answers

If you are using a GenericContainer object type you can simply do something like this:

WaitingConsumer consumer = new WaitingConsumer();
container.followOutput(consumer, STDOUT);
consumer.waitUntil(frame -> frame.getUtf8String().contains("STARTED"), 30, TimeUnit.SECONDS);

Else you can process the entire log with:

container.getLogs();

Hope this was helpful!

You can use a log message wait strategy to achieve it.

public GenericContainer containerWithLogWait = new GenericContainer(DockerImageName.parse("redis:5.0.3")) .withExposedPorts(6379) .waitingFor( Wait.forLogMessage(".*Ready to accept connections.*\\n", 3) );

You can also create your own strategy by extending it from AbstractWaitStrategy.

Check this page for more details.