invalid type error calling method from test class

Question

Trying to call a Class method from a test class:

Class UtilHelper

 global class FeeWrapper {
        global List<Project__c> transToUpdate;
    }

 public static FeeWrapper PassingRentFee(Fee_Calculation__c Config, Project__c trans, List<Project__c> transToUpdate, Map<String, Fee_Mapping__c> m_Fee) 
    

Test class

 Map<String,Fee_Mapping__c > afMap = new Map<String,Fee_Mapping__c >(
            [ SELECT Id, Fee_Amount__c , _Fee_Basis__c , WO__c,Group__c,Type__c,Macro_Type__c 
              FROM Fee_Mapping__c]);
 List<Fee_Calculation__c > feeRec = [
                SELECT Id, Name
                FROM Fee_Calculation__c];
 List<Project__c> projectRec = [
                SELECT Id, Name
                FROM sProject__c];
    
UtilHelper.PassingRentFee rcp = new UtilHelper.PassingRentFee(feeRec[0],projectRec[0],projectRec,afMap); ***error Invalid type***

Is it the parameter I am passing in or is it my syntax. Or both that is causing the error?

Answer 1

This line contains three errors.

UtilHelper.PassingRentFee rcp = new UtilHelper.PassingRentFee(...);

1. Invoking new to create an instance requires parentheses:

    UtilHelper.PassingRentFee rcp = new UtilHelper().PassingRentFee(...);
   

2. The name of the inner class is FeeWrapper, not PassingRentFee.

3. But your method is static and is not called on an instance at all, but on the class.

The final version should be

    UtilHelper.FeeWrapper rcp = UtilHelper.PassingRentFee(...);