Consider to use the tool ABAP test double

DATA(customizing_reader) = CAST /clean/customizing_reader( cl_abap_testdouble=>create( '/clean/default_custom_reader' ) ).
cl_abap_testdouble=>configure_call( customizing_reader )->returning( sub_claim_customizing ).
customizing_reader->read( 'SOME_ID' ).

Shorter and easier to understand than custom test doubles:

" anti-pattern
CLASS /dirty/default_custom_reader DEFINITION FOR TESTING CREATE PUBLIC.
  PUBLIC SECTION.
    INTERFACES /dirty/customizing_reader.
    DATA customizing TYPE /dirty/customizing_table.
ENDCLASS.

CLASS /dirty/default_custom_reader IMPLEMENTATION.
  METHOD /dirty/customizing_reader~read.
    result = customizing.
  ENDMETHOD.
ENDCLASS.

METHOD test_something.
  DATA(customizing_reader) = NEW /dirty/customizing_reader( ).
  customizing_reader->customizing = sub_claim_customizing.
ENDMETHOD.

From SAP/styleguides under CC BY 3.0 — more details
Last updated on 2026-07-26

Use dependency inversion to inject test doubles Exploit the test tools