* :doc:`/reference/creating_test_doubles` * :doc:`/reference/expectations` * :doc:`/reference/argument_validation` * :doc:`/reference/alternative_should_receive_syntax` * :doc:`/reference/spies` * :doc:`/reference/partial_mocks` * :doc:`/reference/protected_methods` * :doc:`/reference/public_properties` * :doc:`/reference/public_static_properties` * :doc:`/reference/pass_by_reference_behaviours` * :doc:`/reference/demeter_chains` * :doc:`/reference/final_methods_classes` * :doc:`/reference/magic_methods` * :doc:`/reference/phpunit_integration`
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.