.. index::
single: Cookbook; Detecting Mock Objects
Detecting Mock Objects
======================
Users may find it useful to check whether a given object is a real object or a
simulated Mock Object. All Mockery mocks implement the
``\Mockery\MockInterface`` interface which can be used in a type check.
.. code-block:: php
assert($mightBeMocked instanceof \Mockery\MockInterface);
In case of an error, the API will return an error response containing a specific error code 400, 403 Failed and a user-friendly message. Refer to our API documentation for a comprehensive list of error codes and their descriptions.