You can see in the logs that Testcontainers pulls the Postgres Docker image from Docker Hub (if not already available locally), starts the container, and runs the test.

Writing an integration test using Testcontainers works like writing a unit test that you can run from your IDE. Your teammates can clone the project and run tests without installing Postgres on their machines.

Summary

The Testcontainers for Java library helps you write integration tests using the same type of database (Postgres) that you use in production, instead of mocks. Because you aren't using mocks and instead talk to real services, you're free to refactor code and still verify that the application works as expected.

In addition to Postgres, Testcontainers provides dedicated modules for many SQL databases, NoSQL databases, messaging queues, and more. You can use Testcontainers to run any containerized dependency for your tests.

To learn more about Testcontainers, visit the Testcontainers overview.

Run tests ​

Run tests and next steps ​

Run the tests ​

Summary ​

Further reading ​

Run tests

Run tests and next steps

Run the tests

Summary

Further reading