Using code coverage effectively

Code coverage is an indispensable tool for quality assurance in software development. But how can it be used effectively to reliably detect untested code?

Here, I will show you how you can use code coverage to identify specific weaknesses in your tests. Using practical examples and proven strategies, you will learn how to analyse the coverage of your tests and close gaps to increase the stability and maintainability of your code.

High test coverage is often equated with good test quality. This is a fallacy that can lead to a false sense of security. We discuss how we can go beyond mere percentages and improve the informative value of code coverage. The goal is to optimise the use of code coverage as a strategic tool and thus take quality assurance to the next level.

If you want to be sure that software works properly, you have to test it continuously. Tools such as PHPUnit are constantly being improved, as are best practices for their use.

It doesn't matter whether you already have many years of experience testing PHP software with PHPUnit or are just getting started in the world of testing, for example in our training courses Test Automation with PHPUnit or Advanced PHPUnit: When it comes to testing software, there is always something new to learn and old patterns to rethink.

In Tester's Corner, we concisely cover a topic related to automated software testing every month.

• Detect untested code
• Line Coverage, Branch Coverage, Path Coverage
• Increase code coverage precision through attributes

Tester's Corner is aimed at all developers who test their software with PHPUnit. Whether you are a beginner or an experienced user of PHPUnit, there is always something new to learn here.

Prerequisites are (at least initial) practical experience with PHPUnit and knowledge of object-oriented programming in PHP. The necessary basics are taught in the training courses Test Automation with PHPUnit and OOP Done Right.

• Understand PHPUnit, from the basics to advanced problem solving
• Gain comprehensive knowledge of lesser-known features and techniques
• Continuously optimise your test strategy to adapt it to new requirements.