How to Set Up Selenium WebDriver, Capybara, and Rails Minitest on WSL2

Описание: Learn how to correctly configure Selenium WebDriver, Capybara, and Rails Minitest in a WSL2 environment to avoid common errors and ensure smooth testing.
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This video is based on the question https://stackoverflow.com/q/68676566/ asked by the user 'abeidahmed' ( https://stackoverflow.com/u/9258733/ ) and on the answer https://stackoverflow.com/a/68676756/ provided by the user 'abeidahmed' ( https://stackoverflow.com/u/9258733/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Setting Up Selenium WebDriver, Capybara, and Rails Minitest on WSL2

Getting the testing framework just right for your Ruby on Rails application can prove to be a challenging task. Particularly when you introduce tools like Selenium WebDriver and Capybara. If you’re using Windows Subsystem for Linux (WSL2) and have already installed Google Chrome and ChromeDriver, you might still encounter issues. One common error is the net::ERR_NAME_NOT_RESOLVED which can leave many puzzled. In this guide, we will walk you through the setup process step-by-step and resolve that pesky error you may face.

Understanding the Problem

Before we dive into the solutions, let's break down the situation. You have your Rails application setup, and you're attempting to run an integration test using Selenium WebDriver and Capybara. Your current configuration might look something like this, with the test attempting to navigate to a URL that doesn't resolve correctly:

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When you run your test, you stumble upon an error like the following:

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This error indicates that the application cannot resolve the hostname app.example.com, which leads to a failed test execution.

How to Fix the Issue

Step 1: Update the app_host Configuration

To resolve the error, we need to make a small but critical change to your configuration. Instead of setting Capybara.app_host to the non-functional URL, we will point it to a more reliable endpoint:

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The lvh.me domain is a special domain that always resolves to 127.0.0.1, which is a localhost address, making it perfect for testing your applications without networking issues.

Step 2: Ensure Including the Port

Sometimes, it's necessary to ensure that Capybara includes the port number in the request. You can do this by adding a simple configuration in your application_system_test_case.rb:

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Including the port helps Capybara correctly interpret the requests, preventing additional networking issues during testing.

Your Updated Test Configuration

Here’s how your Rails configuration files would look after updates:

test/application_system_test_case.rb

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test/system/users_test.rb

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Conclusion

By simply changing the app_host to http://app.lvh.me and ensuring that the port is included, you can resolve the net::ERR_NAME_NOT_RESOLVED error in your Rails Minitest configuration using Capybara and Selenium WebDriver. Now, you'll be able to run your tests seamlessly. Happy testing!