A toolkit with common assertions and mocks that plays nicely with the standard library

testify

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).

mockery

generate massive amounts of realistic fake data in Node.js and the browser

faker.js

Most popular Mocking framework for unit tests written in Java

testify

mockery

faker.js

mockito