Testcontainers is a Ruby library that provides a convenient way to run Docker containers for your tests. It is inspired by the popular Testcontainers library for Java.

This library simplifies the process of managing Docker containers during testing, making it easier to ensure a consistent and isolated environment for each test. It supports a wide range of containers, including databases, message queues, and web servers.


Install the gem and add to the application's Gemfile by executing:

$ bundle add testcontainers

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install testcontainers


To use Testcontainers in your tests, first create and start a container in your test setup. For example, to run a Redis container:

container = Testcontainers::DockerContainer.new("redis:6.2-alpine").with_exposed_port(6379)

In your tests, you can now access the container's host and mapped port:

host = container.host
port = container.mapped_port(6379)

This allows you to connect to the containerized service and perform your tests. After running your tests, you can stop and delete the container:


For a more detailed example, please refer to the Quickstart Guide under the docs folder.


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.


Bug reports and pull requests are welcome on GitHub at https://github.com/guilleiguaran/testcontainers. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Testcontainers project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.