Mocking a Fluent Interface with PHPUnit

In PHPUnit it's quite possible to completely mock a class that employs a fluent interface without too much heavy lifting.

  $mock = $this->getMock('Zend_Mail');
  $mock->expects($this->any())
            ->method(new PHPUnit_Framework_Constraint_IsAnything())
            ->will($this->returnSelf());

This has the effect of making any method call on your mock object return a reference to itself.