How To Fix ABAP_TESTDOUBLE035 - &4 Double cannot be created for class having private constructor

SAP Error Message - Details

• Message type: E = Error

• Message class: ABAP_TESTDOUBLE -

• Message number: 035

• Message text: &4 Double cannot be created for class having private constructor

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ABAP_TESTDOUBLE035 - &4 Double cannot be created for class having private constructor ?

  The SAP error message ABAP_TESTDOUBLE035 indicates that there is an attempt to create a test double (like a mock or stub) for a class that has a private constructor. In ABAP, a test double is often used in unit tests to simulate the behavior of a class without invoking its actual implementation.
  Cause:
  The error occurs because the class you are trying to create a test double for has a private constructor. In ABAP, if a class has a private constructor, it cannot be instantiated outside of its own definition. This restriction prevents the test framework from creating an instance of the class, which is necessary for creating a test double.
  Solution:
  To resolve this issue, you have a few options:
  
  
  Change the Constructor Visibility:
  
  If possible, change the constructor of the class from private to protected or public. This allows the test framework to create an instance of the class and subsequently create a test double.
  
  
  
  Use a Factory Method:
  
  Implement a factory method within the class that can create instances of the class. This method can be made public or protected, allowing the test framework to call it and create an instance of the class.
  
  
  
  Refactor the Class:
  
  If the class is designed to be a singleton or has a specific reason for having a private constructor, consider refactoring the class to allow for better testability. This might involve introducing interfaces or abstract classes that can be mocked.
  
  
  
  Use Dependency Injection:
  
  If the class is being used as a dependency in another class, consider using dependency injection. This allows you to pass in a mock or stub of the class during testing without needing to instantiate the original class.
  
  
  
  Test the Class Without a Test Double:
  
  If the class is not too complex, you might consider testing it directly without using a test double. This approach can sometimes simplify the testing process.
  
  
  
  Related Information:
  
  Unit Testing in ABAP: Familiarize yourself with the principles of unit testing in ABAP, including the use of test doubles, mocks, and stubs.
  ABAP Class Design: Understanding best practices in ABAP class design can help you create more testable code. This includes principles like SOLID and the use of interfaces.
  SAP Documentation: Refer to the official SAP documentation for more details on unit testing and the use of test doubles in ABAP.
  
  By addressing the visibility of the constructor or refactoring the class, you should be able to resolve the ABAP_TESTDOUBLE035 error and successfully create test doubles for your classes.