Test on Artem Yegorov

Use Docker in Ruby with donce (docker once) gem

Mon, 23 Mar 2026 13:55:33 +0000

Do you work with Ruby and like Docker? I advise you to pay attention to donce gem. This is a simple but effective wrapper around the docker run command that allows you to run one-off containers of an image you specify. One of the main features is that you can run a container by passing the contents of the Dockerfile as a string. This is a very useful tool that allows you to run various tools in your tests or CI scripts without installing them as a dependency on your system.

Webmock for test external HTTP API calls

Wed, 07 Jan 2026 11:16:20 +0000

One of my favorite libraries for testing external HTTP requests in Ruby is Webmock. To use it, you just need to specify what you want to get for which URL. Of course, you can also stab the response from the HTTP client in tests (as is common in other languages) or even set up your own HTTP mock server, but in my opinion, for simple things, this seems too unreasonable. How do you test requests to external resources? Share your best practices for testing HTTP requests.