Скачать или смотреть Resolving Javascript Unit Testing Issues with Intern and Selenium in Docker

Learn how to effectively troubleshoot and run your Javascript unit tests with Intern in a Selenium Docker environment, overcoming common errors and enhancing your testing process.
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This video is based on the question https://stackoverflow.com/q/69838640/ asked by the user 'Cian McCann' ( https://stackoverflow.com/u/15089793/ ) and on the answer https://stackoverflow.com/a/69928752/ provided by the user 'djmonki' ( https://stackoverflow.com/u/11543023/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Javascript Unit Testing with Intern and Selenium in a Docker Environment

Unit testing is a critical aspect of any software development process. It ensures that individual components of your application function correctly before deploying them into production. However, running unit tests in different environments can sometimes present unique challenges. One such challenge is running Javascript unit tests with Intern through a Chrome Driver in a Selenium Docker image.

If you’ve encountered issues while trying to execute your unit tests in this setup, you’re not alone! In this guide, we will explore the problem and provide a step-by-step solution to help you successfully run your tests.

Identifying the Problem

When attempting to run your Javascript unit tests using Intern through a Chrome Driver on a Selenium Docker Image, you might face various errors. In this scenario, a common error observed is:

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This error usually indicates that the connection to the specified address (in this case, localhost:9000) is failing. Let’s break down how to address this issue systematically.

Step-by-Step Solution

Step 1: Remove Manual Chrome Driver Installation

In the original setup, there was a step to manually install the Chrome Driver onto the standalone Chrome image. This step is unnecessary and can cause conflicts:

Recommendation: Completely remove Step 3 where the manual installation of the Chrome Driver is attempted. The official Selenium Docker images already come with the correct versions of browsers and drivers pre-installed.

Step 2: Update the Intern Configuration

Remove Platform and Version: In the configuration file associated with Intern, ensure that all references to the following variables are removed:

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Update Proxy Configuration: The existing proxy configuration points to localhost, which can create issues because the Docker container resolves localhost to itself. Instead:

Find the IP address of your local machine.

Update the proxy URL in your Intern configuration to this IP:

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Alternative Hostname Setup: If you prefer using a domain name instead of an IP address, you can add a host entry when running your Docker container:

Modify your Docker run command:

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Update your local machine's hosts file by adding the following line:

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Final Intern Configuration: With the adjustments made, your Intern proxy configuration should correctly reference your local IP or domain:

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Conclusion

By following the steps outlined above, you should be able to resolve errors associated with running Javascript unit tests using Intern through a Chrome Driver on a Selenium Docker Image. Always ensure that the configurations reflect the correct environment settings, especially when dealing with network-related issues.

Remember, testing in isolated environments like Docker can sometimes add complexity; however, with the right approach, you can streamline your setup for an efficient testing process. Happy coding and testing!