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PHPUnit is a unit testing framework for the PHP programming language. It is an instance of the xUnit architecture for unit testing frameworks. PHPUnit was created by Sebastian Bergmann and its development is hosted on GitHub.

Unit testing is a software testing method where individual units or components of a software application are tested in isolation. PHPUnit allows developers to write test cases for their PHP code, which can be run automatically to ensure that the code is working as expected.

PHPUnit supports various types of tests such as unit tests, functional tests, and integration tests. It also provides a wide range of assertions to check the behavior of the code, and it can be easily integrated with other testing tools and frameworks.

PHPUnit also provides a number of advanced features like data providers, test suites, and test listeners, which can be used to organize and execute large numbers of tests. Additionally, it can be used in both procedural and object-oriented programming and can be integrated with various other tools like Continuous Integration servers, Code coverage tools, etc.