I Asked Copilot To Write Unit Tests – It Wasn’t Great

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Learn how to harness the power of GitHub Copilot with Visual Studio Code for generating C# unit tests using xUnit. I will walk you through the process, highlighting the strengths and limitations of Copilot, and share valuable tips on developing an effective strategy for writing unit tests.
As you will witness, Copilot often struggles to understand the context and generate test cases that are substantially different from the ones written already - which is the core purpose of testing! In this video, we will experiment with various approaches, such as providing more detailed method signatures and parameter names. Through trial and error, we discover that Copilot might work best when given more explicit guidance through comprehensive method names and parameters rather than using written requests.
In addition to the context-related issues, you will see that Copilot sometimes generates code that doesn't compile or fails to identify corner cases. These are serious impediments when writing unit tests. However, we could overcome these limitations by actively guiding Copilot and serving it with corner cases.
By the end of the video, we successfully implement a function and its corresponding unit tests, showcasing that with the right strategy, Copilot can be an effective tool for writing unit tests.

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Hi, I’m Zoran, I have more than 20 years of experience as a software developer, architect, team lead, and more. I have been programming in C# since its inception in the early 2000s. Since 2017 I have started publishing professional video courses at Pluralsight and Udemy and by this point, there are over 100 hours of the highest-quality videos you can watch on those platforms. On my YouTube channel, you can find shorter video forms focused on clarifying practical issues in coding, design, and architecture of .NET applications.❤️
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