5 Unit Testing Tips for Refactoring Legacy Code
This video has 5 tips to make your day easier when unit testing code that didn't have tests before. Legacy code normally was never designed to be tested but with some easy tweaks you can make it much easier to test your code. The tips aren't specific to any language but there are some examples in .Net using XUnit that hopefully you can follow along with even if you don't use .Net.
We will be using the TicTacToe app from a previous video. Adjusting the code slightly so unit tests are possible. We will point out the structure of a good test, breaking up test cases and testing attributes in Xunit. On top of that we show how you can test internal variables/methods in your unit tests.
TicTacToe in under 200 Lines - • How to Write Tic Tac Toe in .NET WPF in un...
Git Repo Link - https://github.com/alethcoe/TicTacToe...
XUnit Theories - https://andrewlock.net/creating-param...
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Tips
1. Unit tests give us more confidence and allow us to save time over manual testing.
2. Changing method signatures can help test, overloading allows the program to run as it did.
3. Good Test names help you narrow down any problems that come up when something fails.
4. Don't test every possiblity. Test the most realistic buisness cases and how things may fail.
5. Tests don't need to call the method they are testing directly. They can test inner methods that are private.
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