Automated repository tests

Estimated reading time: 3 minutes

Docker Hub can automatically test changes to your source code repositories using containers. You can enable Autotest on any Docker Hub repository to run tests on each pull request to the source code repository to create a continuous integration testing service.

Enabling Autotest builds an image for testing purposes, but does not automatically push the built image to the Docker repository. If you want to push built images to your Docker Hub repository, enable Automated Builds.

Set up automated test files

To set up your automated tests, create a docker-compose.test.yml file which defines a sut service that lists the tests to be run. The docker-compose.test.yml file should be located in the same directory that contains the Dockerfile used to build the image.

For example:

sut:
  build: .
  command: run_tests.sh

The example above builds the repository, and runs the run_tests.sh file inside a container using the built image.

You can define any number of linked services in this file. The only requirement is that sut is defined. Its return code determines if tests passed or not. Tests pass if the sut service returns 0, and fail otherwise.

Note: Only the sut service and all other services listed in depends_on are started. For instance, if you have services that poll for changes in other services, be sure to include the polling services in the depends_on list to make sure all of your services start.

You can define more than one docker-compose.test.yml file if needed. Any file that ends in .test.yml is used for testing, and the tests run sequentially. You can also use custom build hooks to further customize your test behavior.

Note: If you enable Automated builds, they also run any tests defined in the test.yml files.

Enable automated tests on a repository

To enable testing on a source code repository, you must first create an associated build-repository in Docker Hub. Your Autotest settings are configured on the same page as automated builds, however you do not need to enable Autobuilds to use Autotest. Autobuild is enabled per branch or tag, and you do not need to enable it at all.

Only branches that are configured to use Autobuild push images to the Docker repository, regardless of the Autotest settings.

  1. Log in to Docker Hub and select Repositories in the top navigation.

  2. Select the repository you want to enable Autotest on.

  3. From the repository view, click the Builds tab.

  4. Click Configure automated builds.

  5. Configure the automated build settings as explained in Automated Builds.

    At minimum you must configure:

    • The source code repository
    • the build location
    • at least one build rule

  6. Choose your Autotest option.

    The following options are available:

    • Off: No additional test builds. Tests only run if they’re configured as part of an automated build.

    • Internal pull requests: Run a test build for any pull requests to branches that match a build rule, but only when the pull request comes from the same source repository.

    • Internal and external pull requests: Run a test build for any pull requests to branches that match a build rule, including when the pull request originated in an external source repository.

    Note: For security purposes, autotest on external pull requests is limited on public repositories. Private images are not pulled and environment variables defined in Docker Hub are not available. Automated builds continue to work as usual.

  7. Click Save to save the settings, or click Save and build to save and run an initial test.

Check your test results

From the repository’s details page, click Timeline.

From this tab you can see any pending, in-progress, successful, and failed builds and test runs for the repository.

You can click any timeline entry to view the logs for each test run.

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