Mock Object library for PHPUnit

 PHPUnit_MockObject is a PHPUnit extension that provides Mock Objects for
 PHPUnit.
 .
 According to the PHPUnit manual "The practice of replacing an object
 with a test double that verifies expectations, for instance asserting
 that a method has been called, is referred to as mocking.".
 .
 PHPUnit is a unit testing suite for the PHP language, modelled on the xUnit
 testing framework.