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Testing
Injection

Don't misuse LOCAL FRIENDS to invade the tested code

Unit tests that access private and protected members to insert mock data are fragile: they break when the internal structure of the tested code changes.

" anti-pattern
CLASS /dirty/class_under_test DEFINITION LOCAL FRIENDS unit_tests.
CLASS unit_tests IMPLEMENTATION.
  METHOD returns_right_result.
    cut->some_private_member = 'AUNIT_DUMMY'.
  ENDMETHOD.
ENDCLASS.
From SAP/styleguides under CC BY 3.0 — more details
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Use LOCAL FRIENDS to access the dependency-inverting constructorDon't add test-only features to production