I added the following apex classes and triggers to our Sandbox enviroment that worked fine but when I try to deploy it in production I got an error that apex classes need 75% coverge and triggerse need at least 1%.  Both are currently at 0%. How do I add code coverge in order to delpoy these?  Both classes and the trigger are included below:

SetRevenueSchedule
trigger setRevenueSchedule on OpportunityLineItem (after insert, after update) {
    if(RecursionBlocker.flag){
                
        if (trigger.isAfter && trigger.isInsert){
            RevenueController.insertRevenue(trigger.new);
        }   
        
        if (trigger.isAfter && trigger.isUpdate){
            RevenueController.updateRevenue(trigger.newMap, trigger.oldMap);
        }     
    }//end of if recursionblocker is true.
    
}


RecursionBlocker
public with sharing class RecursionBlocker {
  public static Boolean flag = true;
}

RevenueController
public class RevenueController
{   
    public static void insertRevenue(List<OpportunityLineItem> LI){
        List<OpportunityLineItemSchedule> oppLS = new List<OpportunityLineItemSchedule>();
        
        Date ServiceDate;
        Date EndDate;

        Decimal monthlyRevenue = 0, TotalPrice = 0, UnitPrice = 0;
    
        Integer NumberOfRevenueInstallments, numberOfDays;
        String RevenueInstallmentPeriod = 'Daily';
        String RevenueScheduleType = 'Divide';
               
        List<Id> oliIds = new List<Id>();
        for (OpportunityLineItem olit : LI){
            oliIds.add(olit.Id);
        }
        
        for (OpportunityLineItem item : [SELECT Id, ServiceDate, End_Date__c, UnitPrice, TotalPrice, PricebookEntryId FROM OpportunityLineItem WHERE Id IN :oliIds]) {
            
            ServiceDate = item.ServiceDate;
            EndDate = item.End_Date__c;
            TotalPrice = item.TotalPrice;
            UnitPrice = item.UnitPrice;
                    
            NumberOfRevenueInstallments = (((EndDate.year() * 12) + EndDate.MONTH()) - ((ServiceDate.year() * 12) + ServiceDate.month()));
            numberOfDays = ServiceDate.daysBetween(EndDate) + 1;
            
            monthlyRevenue = (TotalPrice / numberOfDays);
            
            Decimal computedRevenue = 0;
            for(Integer i=0; i<numberOfDays; i++){
                Date newDate = ServiceDate.addDays(i);
                computedRevenue = computedRevenue + monthlyRevenue;
                if(i == numberOfDays && (computedRevenue < TotalPrice || computedRevenue > TotalPrice)){
                    monthlyRevenue = (monthlyRevenue + (TotalPrice - computedRevenue)).abs();
                }
                if(i == numberOfDays && newDate > EndDate){
                    newDate = EndDate;
                }

            OpportunityLineItemSchedule opS = new OpportunityLineItemSchedule(OpportunityLineItemId = item.Id, Type='Revenue', Revenue = monthlyRevenue, ScheduleDate = newDate);
                oppLS.add(opS);
                                
            }
        }
                        
        RecursionBlocker.flag = false;
                                                
        try{
            insert oppLS;
            system.debug('#Success from insert :');
        } catch(system.DmlException e){
            system.debug('##Error OpportunityLineItemSchedule : ' + e.getMessage()); 
        }
    }   
        
    public static void updateRevenue(map<Id, OpportunityLineItem> newOppsMap, map<Id, OpportunityLineItem> oldOppsMap){
        
        List<OpportunityLineItemSchedule> oppLS = new List<OpportunityLineItemSchedule>();
        List<OpportunityLineItemSchedule> oldoppLS = new List<OpportunityLineItemSchedule>();
    
        list<OpportunityLineItem> newOppLiList = new list<OpportunityLineItem>();
        
        Date ServiceDate;
        Date EndDate;
        
        Decimal Revenue = 0, TotalPrice = 0;
    
        Integer NumberOfRevenueInstallments, numberOfDays;
        String RevenueInstallmentPeriod = 'Daily';
        String RevenueScheduleType = 'Divide';
        
        Set<Id> opportunityLineItemIds = new Set<Id>();
        Set<Id> newId = new Set<Id>();
        
        for(Id liId :newOppsMap.keySet()){
            opportunityLineItemIds.add(newOppsMap.get(liId).Id);
            OpportunityLineItem temp = new OpportunityLineItem();
            
            if((newOppsMap.get(liId).ServiceDate != oldOppsMap.get(liId).ServiceDate) || (newOppsMap.get(liId).End_Date__c != oldOppsMap.get(liId).End_Date__c)){
                newId.add(newOppsMap.get(liId).Id);
            }

            temp.OpportunityId = newOppsMap.get(liId).OpportunityId;
            newOppLiList.add(temp);
        }
        
        if(newId.size() > 0){
            for(OpportunityLineItemSchedule ps : [SELECT Id, OpportunityLineItemId From OpportunityLineItemSchedule Where OpportunityLineItemId IN :opportunityLineItemIds]){
                OpportunityLineItemSchedule tempS = new OpportunityLineItemSchedule();
                tempS.Id = ps.Id;
                oldoppLS.add(tempS);
            }
            
            for (OpportunityLineItem item : [SELECT Id, ServiceDate, End_Date__c, UnitPrice, TotalPrice, PricebookEntryId FROM OpportunityLineItem WHERE Id IN :opportunityLineItemIds]) {
                
                ServiceDate = item.ServiceDate;
                EndDate = item.End_Date__c;
                TotalPrice = item.UnitPrice;
                        
                NumberOfRevenueInstallments = (((EndDate.year() * 12) + EndDate.MONTH()) - ((ServiceDate.year() * 12) + ServiceDate.month()));
                numberOfDays = ServiceDate.daysBetween(EndDate);
                                
                Revenue = (TotalPrice / numberOfDays);
                
                Decimal computedRevenue = 0;
                for(Integer i=0; i<numberOfDays; i++){
                    Date newDate = ServiceDate.addDays(i);
                    computedRevenue = computedRevenue + Revenue;
                    if(i == numberOfDays && (computedRevenue < TotalPrice || computedRevenue > TotalPrice)){
                        Revenue = (Revenue + (TotalPrice - computedRevenue)).abs();
                    }
                    if(i == numberOfDays && newDate > EndDate){
                        newDate = EndDate;
                    }

                OpportunityLineItemSchedule opS = new OpportunityLineItemSchedule(OpportunityLineItemId = item.Id, Type='Revenue', Revenue = Revenue, ScheduleDate = newDate);
                    oppLS.add(opS);
                                    
                }
            }
                            
            RecursionBlocker.flag = false;
                                                            
            try{
                insert oppLS;
                system.debug('#Success insert oppLS : ' + oppLS.size());
            } catch(system.DmlException e){
                system.debug('##Error OpportunityLineItemSchedule : ' + e.getMessage()); 
            }
            
            try{
                delete oldoppLS;
                system.debug('#Success Delete oppLS');
            } catch(system.DmlException e){
                system.debug('##Error OpportunityLineItemSchedule : ' + e.getMessage()); 
            }   
        }
    }
}

Thanks!

Theo