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.. index:: single: Cookbook; Big Parent Class Big Parent Class ================ In some application code, especially older legacy code, we can come across some classes that extend a "big parent class" - a parent class that knows and does too much: .. code-block:: php class BigParentClass { public function doesEverything() { // sets up database connections // writes to log files } } class ChildClass extends BigParentClass { public function doesOneThing() { // but calls on BigParentClass methods $result = $this->doesEverything(); // does something with $result return $result; } } We want to test our ``ChildClass`` and its ``doesOneThing`` method, but the problem is that it calls on ``BigParentClass::doesEverything()``. One way to handle this would be to mock out **all** of the dependencies ``BigParentClass`` has and needs, and then finally actually test our ``doesOneThing`` method. It's an awful lot of work to do that. What we can do, is to do something... unconventional. We can create a runtime partial test double of the ``ChildClass`` itself and mock only the parent's ``doesEverything()`` method: .. code-block:: php $childClass = \Mockery::mock('ChildClass')->makePartial(); $childClass->shouldReceive('doesEverything') ->andReturn('some result from parent'); $childClass->doesOneThing(); // string("some result from parent"); With this approach we mock out only the ``doesEverything()`` method, and all the unmocked methods are called on the actual ``ChildClass`` instance.