Скачать или смотреть How to Run sbt it:test in Docker Compose for Scala Integration Testing

Learn how to effectively set up and execute `sbt it:test` using Docker Compose in Scala. Follow this guide for a seamless testing experience!
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Solving Integration Test Issues in Scala with Docker Compose

Integration testing is a crucial part of the software development process. It ensures that various components of your application work together as expected. However, running these tests in different environments can pose challenges, especially when using Docker and Docker Compose. If you've encountered issues while trying to run sbt it:test in a Docker container, you're at the right place! In this guide, we’ll walk through a solution to effectively execute your Scala tests using Docker Compose.

Understanding the Problem

You attempted to use Docker Compose to run integration tests for your Scala application, but were met with errors during execution. Here’s a brief recap of what happened:

The Dockerfile you created included a line to run sbt clean it:test.

Upon execution, you received an error stating that the sbt.version was not set, and the subsequent it:test command was not recognized.

This indicated that the Docker container was unable to locate the necessary sbt configuration files needed to run the tests. While manually running sbt inside the container yielded success, automating the process through Docker Compose was giving you trouble.

Proposed Solution

To resolve this issue, we can modify the Dockerfile to ensure that the sbt command is executed in the appropriate context. Here’s how to do it step by step:

Step 1: Modify the Dockerfile

Instead of directly running sbt clean it:test as part of the Docker build process, we can set it as part of the container's entry point. This change ensures that the command is run in the proper directory, where the sbt configuration files are accessible.

Here’s the amended command you should use in your Dockerfile:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Adjust the docker-compose.yml File (if necessary)

Ensure that your docker-compose.yml file is correctly set up to build and run your test service. Your file already looks good, but just for reference, here it is again:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Build and Run with Docker Compose

Build your Docker image using Docker Compose by navigating to your terminal and running:

[[See Video to Reveal this Text or Code Snippet]]

After the build is successful, run the tests with:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Observe the Output

When you run the above commands, pay attention to the logs produced by the container. If everything is set up correctly, you should see sbt compiling your tests without the previous errors.

Conclusion

Using Docker Compose to manage your Scala integration tests can be a hassle if the commands within your Dockerfile aren’t set correctly. By changing the way you invoke the sbt command — specifically, by using the ENTRYPOINT — you can ensure that the tests run smoothly in your Docker environment.

If you continue to face issues, double-check your project structure and ensure that all necessary configuration files are correctly placed within your WORK_DIR.

Happy testing with Docker Compose in Scala! Don't hesitate to share your thoughts or ask questions in the comments below!