How To Fix ABAP_TESTDOUBLE036 - &4 Double cannot be created if all methods in a class are set to FINAL

SAP Error Message - Details

• Message type: E = Error

• Message class: ABAP_TESTDOUBLE -

• Message number: 036

• Message text: &4 Double cannot be created if all methods in a class are set to FINAL

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ABAP_TESTDOUBLE036 - &4 Double cannot be created if all methods in a class are set to FINAL ?

  The SAP error message ABAP_TESTDOUBLE036 indicates that a double cannot be created because all methods in a class are marked as FINAL. This error typically arises in the context of ABAP unit testing when you are trying to create a test double (like a mock or stub) for a class that has all its methods declared as FINAL.
  Cause:
  In ABAP, when a method is declared as FINAL, it cannot be overridden in subclasses. This restriction prevents the creation of test doubles for such methods because test doubles rely on the ability to override methods to simulate behavior. If all methods in a class are marked as FINAL, the testing framework cannot create a mock or stub for that class, leading to the error.
  Solution:
  To resolve this error, you have a few options:
  
  
  Remove the FINAL Keyword: If possible, consider removing the FINAL keyword from the methods in the class. This will allow the creation of test doubles. However, be cautious with this approach, as it may affect the design and intended behavior of your class.
  
  
  Refactor the Class: If removing FINAL is not an option due to design constraints, consider refactoring the class. You could extract the methods into a new base class that is not FINAL, allowing you to create test doubles for that base class.
  
  
  Use Dependency Injection: Instead of relying on test doubles, you can use dependency injection to pass dependencies into your class. This way, you can provide mock implementations of dependencies without needing to create test doubles for the class itself.
  
  
  Test the Class Directly: If the class is designed in such a way that it does not require mocking, you can write tests that directly instantiate and test the class without needing to create test doubles.
  
  
  Related Information:
  
  ABAP Unit Testing: Familiarize yourself with the principles of ABAP unit testing, including how to create mocks and stubs, and the implications of using FINAL methods.
  Design Patterns: Understanding design patterns such as Dependency Injection and the Strategy Pattern can help you design your classes in a way that facilitates easier testing.
  SAP Documentation: Refer to the official SAP documentation for more details on ABAP unit testing and the use of FINAL methods.
  
  By considering these solutions and related information, you can effectively address the ABAP_TESTDOUBLE036 error and improve your unit testing strategy in ABAP.