stub

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).

Test spies, stubs and mocks for JavaScript.

Boilerplate-free mocking framework for Swift!

A mocking and stubbing library for Ruby