Test class for sobject record type [duplicate]

Question

I am trying to cover the below class. I am getting 71%. Can you please let me know how to cover .

public class OpportunityRecordTypeSelectionCtr {

@AuraEnabled
public static string findRecordTypes(string objName){
    string returnString='';
    string queryString='Select id, name from RecordType where sobjectType =: objName and IsActive=true ORDER BY Name DESC';
    List<sobject> recordList= Database.query(queryString);
    List<RecordTypeWrapper> wrapperList=new List<RecordTypeWrapper>();
    for(sobject sb : recordList)  {
        RecordTypeWrapper rw=new RecordTypeWrapper();
        rw.recordTypeLabel=string.valueof(sb.get('name'));
        rw.recordTypeId=string.valueof(sb.get('id'));
        wrapperList.add(rw);
    } 
    returnString= JSON.serialize(wrapperList);
    system.debug('*****'+returnString);
    return returnString;
}
public class RecordTypeWrapper{
    public string recordTypeLabel{get;set;}
    public string recordTypeId{get;set;}
}

}

Test class:

@isTest
private class OpportunityRecordTypeSelectionCtr_Test {
    static testMethod void testRecordTypes(){
    string objName;
    OpportunityRecordTypeSelectionCtr.findRecordTypes(objName);
      string recordTypeLabel;
        string recordTypeId;
    OpportunityRecordTypeSelectionCtr.RecordTypeWrapper recordTypeWrap = new OpportunityRecordTypeSelectionCtr.RecordTypeWrapper();
     recordTypeWrap.recordTypeLabel = recordTypeLabel;
        recordTypeWrap.recordTypeId = recordTypeId;
    }
}

Unable to cover below lines of code.

RecordTypeWrapper rw=new RecordTypeWrapper();
            rw.recordTypeLabel=string.valueof(sb.get('name'));
            rw.recordTypeId=string.valueof(sb.get('id'));
            wrapperList.add(rw);

Answer 1

Your test class is invoking your code with a null sObject name value.

string objName;
OpportunityRecordTypeSelectionCtr.findRecordTypes(objName);

objName is uninitialized and null. Your query therefore returns an empty list.

string queryString='Select id, name from RecordType where sobjectType =: objName and IsActive=true ORDER BY Name DESC';

and recordList is therefore empty, and the for loop never executes.

for(sobject sb : recordList)  {

Test with the name of an object that has record types in your org.