Testing collaborating objects

You want to test code that depends on other code. When should you replace the real dependencies with test stubs or mock objects? When should the code under test work with its real dependencies, and when should it not?

Here you will learn about the advantages and disadvantages of test stubs and mock objects. Afterwards, you will understand how PHPUnit's test double functionality works and which parts you should steer clear of.

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.

• Isolation of the code to be tested from its dependencies
• Testing communication between objects
• Best practices for using test doubles

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.