SObject row was retrieved via SOQL without querying the requested field

Error: SObject row was retrieved via SOQL without querying the requested field

to overcome, we can add the standard controller extension like:

public ContactExt(ApexPages.StandardController sc) {
        sc.addFields(new List<String> {'Account.BillingCity'});
        record = (Contact)sc.getRecord();
}

and make sure to add the isRunningTest, so that there is no issue while creating the test method for above apex class like:

public ContactExt(ApexPages.StandardController sc) {
                  if (!Test.isRunningTest()) { 
            sc.addFields(new List<String> {'Account.BillingCity'});
        }           
        record = (Contact)sc.getRecord();
}

or otherwise, facing the issue while executing the test method like below error:

but while executing the Apex Test Method, its throwing the error like:
System.SObjectException: You cannot call addFields when the data is being passed into the 
controller by the caller

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