Download the source code for this demo on Patreon: https://www.patreon.com/posts/write-unit-tests-85545985
Unit testing is considered by many to be a critical aspect of software development because it ensures that your application works as expected. But how often do you find that your unit tests fail due to unrelated changes in your implementation? If you feel like your unit tests are flawed, you are not alone!
In this video we explore the problem of unit test fragility. We analyze the common pitfall of constructing unit tests that rely too much on specific implementation details, resulting in unstable tests.
The video uses a real-life scenario from a money application to show how a test can fail due to the smallest change in the implementation. The most noticeable change is a change that has nothing to do with the function covered by the test!
But we don't stop at just highlighting the problem; this video offers a solution. The tutorial provides an effective strategy for designing robust tests that are less likely to fail when the implementation changes. Watch this video to gain deep insights into creating unit tests that stand the test of time, largely independent of how your implementation evolves.

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About me
Hi, I'm Zoran and I have over 20 years of experience as a software developer, architect, team leader and more. I have been programming in C# since its introduction in the early 2000s. Since 2017, I have been publishing professional video courses on Pluralsight and Udemy and now there are over 100 hours of the highest quality videos you can watch on these platforms. On my YouTube channel you can find shorter video formats that focus on explaining practical problems in coding, design and architecture of .NET applications.️
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