How to increase code coverage for catch block

Question

I have below Apex class (DAO class) which has a try-catch block. Same try-catch block has been used in 5 different methods. I tried sending setOpportunityId as account id or null id but still, it is not going to catch block.

Class:

public with sharing class OppUpdateDAO {
public static List<Opportunity> getOpportunityData(set<ID> setOpportunityId) {
        try {
            List<Opportunity> opportunityList = new List<Opportunity>();
            opportunityList=[select id , name, stageName,RecordTypeId ,Market__cfrom Opportunity where id in:setOpportunityId ];
            return opportunityList;

        }
        catch (Exception e) {
            Error_Handling__c error = M2O_ErrorHandling.errorHandling (e);
            insert error;
            return null;
        }
    }
}

Answer 1

Lets analyse the code in your try block.

List<Opportunity> opportunityList = new List<Opportunity>();
opportunityList=[select id , name, stageName,RecordTypeId ,Market__cfrom Opportunity where id in:setOpportunityId ];
return opportunityList;

There is no way there can be an catchable exception that can appear in those 3 lines.

The only exception that can occur is Heap or Too many SOQL exceptions which is Limit exception that cannot be caught so catch block is useless.

Theriotically catch block will never be called, and thus I dont think you need a try catch block in the first place.

Solution : Remove the try catch.