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The addition PARTIALLY IMPLEMENTED for statement INTERFACES for implementing interfaces in classes can only be used in test classes. This addition prevents the syntax check error/warning from occurring if not all concrete non-optional interface methods are implemented in the test class. The addition must be specified before the additions that list the attributes or methods.
If an interface method that is not implemented is called during a test, an exception from the class CX_SY_DYN_CALL_ILLEGAL_METHOD is raised.
The addition is particularly useful when classes that are used as test doubles implement interfaces and not all the methods of these implements are called by the code to be tested. Without this addition, it would be necessary to implement all unnecessary methods without values and assign them the needed pragma. This is because implementing methods without values produces a warning from the extended program check.
The class CL_HTTP_EXT_SERVICE_DEMO, described under Calling an HTTP Service, is an example of production code. This class demonstrates the function of a simple HTTP service. If the service is used normally, the method IF_HTTP_EXTENSION~HANDLE_REQUEST from ICF is called. ICF-independent tests can be run for the class: In its test include, local classes are declared as test doubles for the classes of ICF that implement the following interfaces:
CLASS mock_server DEFINITION FOR TESTING FINAL.
INTERFACES if_http_server PARTIALLY IMPLEMENTED.
CLASS mock_server IMPLEMENTATION.
CLASS mock_request DEFINITION FOR TESTING FINAL.
INTERFACES if_http_request PARTIALLY IMPLEMENTED.
CLASS mock_request IMPLEMENTATION.
value = SWITCH spfli-carrid( name WHEN 'carrid' THEN 'LH'
ELSE space ) ##no_text.
CLASS mock_response DEFINITION FOR TESTING FINAL.
INTERFACES if_http_response PARTIALLY IMPLEMENTED.
DATA output TYPE string.
CLASS mock_response IMPLEMENTATION.
me->output = data.
Only the interface methods required for the execution of tests are implemented. The interfaces have numerous other methods. These methods must not be implemented when empty due to the addition PARTIALLY IMPLEMENTED.
The actual test class looks as follows:
CLASS test_http_service DEFINITION FOR TESTING
RISK LEVEL HARMLESS
DATA mock_request TYPE REF TO mock_request.
DATA mock_response TYPE REF TO mock_response.
DATA mock_server TYPE REF TO mock_server.
DATA handler TYPE REF TO cl_http_ext_service_demo.
METHODS test_service FOR TESTING.
CLASS test_http_service IMPLEMENTATION.
CREATE OBJECT mock_request.
CREATE OBJECT mock_response.
CREATE OBJECT mock_server.
CREATE OBJECT handler.
mock_server->if_http_server~request = mock_request.
mock_server->if_http_server~response = mock_response.
handler->if_http_extension~handle_request( mock_server ).
IF mock_response->output NS `meta name="Output" content="Data">`.
cl_abap_unit_assert=>fail( msg = `Wrong output data` ).
In the test method, ICF is simulated by directly creating objects of the test doubles. The REQUEST test double simulates the form field. The RESPONSE test double contains the result that is checked after the method HANDLER is called for testing.