Unison Testing and Debugging: Best Practices

Are you tired of spending countless hours debugging your code? Do you want to ensure that your code is working as expected before deploying it to production? If so, then you need to learn about Unison testing and debugging best practices.

Unison is a powerful programming language that allows you to write code that is easy to read, maintain, and test. In this article, we will explore the best practices for testing and debugging Unison code.

What is Unison Testing?

Unison testing is the process of verifying that your code works as expected. It involves writing test cases that cover all possible scenarios and edge cases. Unison testing is essential for ensuring that your code is reliable and free from bugs.

Best Practices for Unison Testing

  1. Write Test Cases First

One of the best practices for Unison testing is to write test cases before writing the actual code. This approach is known as Test-Driven Development (TDD). TDD ensures that your code is testable and that you have a clear understanding of what your code should do.

  1. Use a Testing Framework

Unison has a built-in testing framework called test. The test framework allows you to write test cases and run them easily. It also provides useful features such as assertions and test coverage reports.

  1. Test All Possible Scenarios

When writing test cases, it is essential to test all possible scenarios and edge cases. This includes testing for invalid inputs, unexpected outputs, and error handling.

  1. Use Mocks and Stubs

Mocks and stubs are useful tools for testing code that depends on external services or libraries. Mocks and stubs allow you to simulate the behavior of external services or libraries, making it easier to test your code in isolation.

  1. Automate Testing

Automating your tests is essential for ensuring that your code is always tested and that you can quickly identify any issues. You can use tools such as Travis CI or CircleCI to automate your tests and ensure that they run every time you push code to your repository.

What is Unison Debugging?

Debugging is the process of identifying and fixing errors in your code. Unison provides several tools for debugging, including the debug function and the trace function.

Best Practices for Unison Debugging

  1. Use the debug Function

The debug function allows you to print debugging information to the console. You can use the debug function to print the values of variables, function arguments, and return values.

  1. Use the trace Function

The trace function allows you to trace the execution of your code. You can use the trace function to print debugging information at specific points in your code.

  1. Use a Debugger

Unison has a built-in debugger called unison-debugger. The unison-debugger allows you to step through your code and inspect variables and function calls.

  1. Use Error Messages

Unison provides detailed error messages that can help you identify the cause of errors in your code. When an error occurs, Unison will provide a stack trace and a description of the error.

  1. Use Logging

Logging is a useful tool for debugging code that runs in production. You can use logging to record information about the execution of your code, such as the values of variables and function calls.


In conclusion, Unison testing and debugging best practices are essential for ensuring that your code is reliable and free from bugs. By following these best practices, you can write code that is easy to test and debug, making it easier to maintain and deploy.

So, what are you waiting for? Start implementing these best practices in your Unison code today and see the difference it makes!

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Written by AI researcher, Haskell Ruska, PhD (haskellr@mit.edu). Scientific Journal of AI 2023, Peer Reviewed