[SalesForce] Test class for batch is not covering the execute method

I have test class for a batch the test class is not covering the execute method of batch. Does anyone have any idea what is the reason for this.
My batch class :

global class updateOwner_StatusNurtureBatch implements Database.Batchable<sObject>{

String Commercial_RecordTypeID = 'RecordTypeID'; // Commercial Record Type ID
String StatusName = 'StatusName'; // Status
String CommNutrure_QueueID = 'QueueID'; // COMM-NURTURE Queue ID
List<Lead> leadUpdate_Lsit = new List<Lead>(); // Lead list for update 
String soql;

String query = 'SELECT Ownerid From Lead Where RecordTypeID = :Commercial_RecordTypeID and Status = :StatusName and OwnerID != :CommNutrure_QueueID';

global updateOwner_StatusNurtureBatch(String query) {
    this.soql = query;
}    

global Database.QueryLocator start(Database.BatchableContext BC){
    return Database.getQueryLocator(soql);
}

global void execute(Database.BatchableContext BC, List<Lead> scope){
     system.debug('scope : ' + scope);

     //Loop through result 
     for(Lead l : scope){
        lead le = new lead();
        le.Id = l.id;
        le.Ownerid = CommNutrure_QueueID;
        leadUpdate_Lsit.add(le); 
     }

     system.debug(' Lead Update List ' + leadUpdate_Lsit);
     update leadUpdate_Lsit;
}

global void finish(Database.BatchableContext BC){
}
}

My test class for this code batch :

@isTest
public class updateOwner_StatusNurtureBatch_Test {

public static testmethod void updateOwner_StatusNurtureBatch_Test(){


    //List<Lead> lList = new List<Lead>();
    //lList.add(l);
   // lList.add(l1);

    string rID = 'RecordTypeID';
    String Sta = 'Status';
    String owner = 'ownerId';


    String query = 'SELECT Ownerid From Lead Where RecordTypeID = ';
    query += '\''+rID+ '\' and Status = ';
    query += '\''+Sta+'\' and OwnerID != ';
    query += '\''+owner+'\'';

    Test.startTest();
    updateOwner_StatusNurtureBatch updateOwnerRunBatch = new updateOwner_StatusNurtureBatch(query);
    ID resultID = Database.executeBatch(updateOwnerRunBatch, 2);  
    system.debug('Result ID : ' + resultID); 
    //updateOwnerRunBatch.execute(null, lList);     
    Test.stopTest();
}
}

What is wrong here why I am not able to cover the execute method. Please help me.