# Introduction ## What is WP\_Mock [WP\_Mock](https://github.com/10up/wp_mock) is a unit test tool for PHP projects that extend or build upon [WordPress](https://wordpress.org/), such as plugins, themes, or even whole websites. WP\_Mock helps mock common WordPress functions and components, making it easier to write unit tests for your project. It also helps perform additional assertions over your code that are not part of the standard toolset. When writing code for WordPress, it so often happens that the code you create needs to invoke a WordPress function, class or hook, which is external code you are integrating your project with. Ideally, though, a unit test will not depend on WordPress being loaded in order to test your code. By constructing mocks, it's possible to simulate WordPress core functionality by defining their expected arguments, responses, the number of times they are called, and more. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wp-mock.gitbook.io/documentation/getting-started/introduction.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.