Unit Testing WordPress Plugins

Unit Testing WordPress Plugins

Adam Morgan

When it comes to testing your code properly, it’s crucial that you perform unit and integration tests. These tests can help to save you a lot of time.  They will also enable you to become a better developer faster. While some developers argue that it cant take too much time to write tests, however, the time you save in the long run far outweighs the initial time and costs associated with writing the tests.

Here, we’re taking a look at three of the top reasons why you should consider unit testing your WordPress plugins.

Unit Tests Eliminate Existing and Future Bugs

If developers take the time to write unit tests, you will be testing your code in its current state.  This will also make sure that it continues to act like it should and do exactly what it is supposed to do. By writing a unit test, you’re also creating tests that can be used again and again. This will help to add more functionality to your code and also ensure that it does exactly what you want it to do.

Just think, if you wrote a piece of code that did not do what it was supposed to and failed to test it, you would send out code that would likely result in frustrated customers, as well as support tickets. Writing tests for your code can also be a great way to debug your code.

Unit Tests Document Your Code

If you choose to write unit tests for your code, you will also be providing helpful documentation for other developers that may work with the same codebase as you.  This means that other developers will be able to read your tests.  Other developers can then establish exactly what the code is doing and shouldn’t be doing before even looking at the code itself.  Plus, good tests are often extremely effective when it comes to explaining the particular ins and outs of your code.

Unit Tests Make Refactoring Code Much Easier

If you don’t write tests for your WordPress plugins, you often won’t be able to easily pinpoint what your refactor broke.  If you opt for decent test coverage, you will know exactly if a specific piece of code has broken another part of your code, as the test will fail.

Are These Good Enough Reasons to Unit Test WordPress Plugins?

When it comes to unit testing, you will easily write more bug-free code.  This will help to reduce support request.  Also, you won’t have to explain over and over how your code works.


Unit tests will also help you to become a better developer.  By taking the time to test your code, you will be able to push code with confidence.  This will ensure that you aren’t breaking WordPress plugins or sending out defective code.  Also, writing unit tests will also force you to use good design and programming patterns.

If you’re still not convinced, why not try it out for yourself.  You will likely see just what a different unit testing can make.

Already using unit testing?  Let us know about your experiences in the comments below.