How To Fix ABAP_TESTDOUBLE018 - &4 Multiple matchers not allowed for the method &1

SAP Error Message - Details

• Message type: E = Error

• Message class: ABAP_TESTDOUBLE -

• Message number: 018

• Message text: &4 Multiple matchers not allowed for the method &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ABAP_TESTDOUBLE018 - &4 Multiple matchers not allowed for the method &1 ?

  The SAP error message ABAP_TESTDOUBLE018 indicates that there are multiple matchers defined for a method in your ABAP unit test, which is not allowed. This typically occurs when you are using the ABAP testing framework and trying to set up a test double (like a mock or stub) for a method that has more than one matcher defined.
  Cause:
  The error arises when:
  
  You are trying to create a test double for a method that has multiple matchers specified in the test setup.
  The ABAP testing framework does not support multiple matchers for a single method call, as it can lead to ambiguity in determining which matcher should be applied.
  
  Solution:
  To resolve this error, you need to ensure that you only have one matcher for the method in question. Here are the steps you can take:
  
  
  Review Your Test Code: Look at the test code where you are setting up the test double. Identify the method that is causing the issue and check how many matchers you have defined for it.
  
  
  Consolidate Matchers: If you find that you have multiple matchers for the same method, you will need to consolidate them into a single matcher. This may involve:
  
  Combining conditions into a single matcher if possible.
  Choosing the most appropriate matcher that covers your test case.
  
  
  
  Refactor Your Test: If the logic of your test requires different conditions, consider refactoring your test to separate the scenarios into different test methods, each with its own matcher.
  
  
  Example: If your original code looks something like this:
  cl_abap_testdouble=>create( 
    method = 'my_method' 
    matchers = [ 
      cl_abap_testdouble=>matcher( ... ), 
      cl_abap_testdouble=>matcher( ... ) 
    ] 
  ).
  You should change it to:
  cl_abap_testdouble=>create( 
    method = 'my_method' 
    matchers = [ 
      cl_abap_testdouble=>matcher( ... ) 
    ] 
  ).
  
  
  Related Information:
  
  ABAP Unit Testing: Familiarize yourself with the ABAP Unit Testing framework and how to use test doubles effectively. The official SAP documentation provides guidelines and examples.
  Matchers: Understand the different types of matchers available in the ABAP testing framework and how they can be used to define expectations for method calls.
  Debugging: If you are unsure where the multiple matchers are coming from, consider using debugging tools to step through your test setup and identify the source of the issue.
  
  By following these steps, you should be able to resolve the ABAP_TESTDOUBLE018 error and successfully run your unit tests.