Hello, I want to cover my test class for If condition. 

@isTest(seeAllData = true)
public class CreateInvoiceDelTest {
    public static testMethod void testManipulateOrders(){
       
        Account a = new Account();
        a.Name = 'Test Account';
        a.Price_Book__c = '01s8E000000DOci';
        insert a;
        
        Contact c = new Contact();
        c.LastName='test';
        insert c;

        Product2 p = new Product2();
        p.Name = ' Test Product ';
        p.Description='Test Product Entry 1';
        p.productCode = 'ABC';
        p.isActive = true;
        p.Family = 'Blackbox'; 
        insert p;

        Pricebook2  standardPb = [select id, name, isActive from Pricebook2 where IsStandard = true limit 1];
    
        PricebookEntry standardPrice = new PricebookEntry();
        standardPrice.Pricebook2Id = standardPb.Id;
        standardPrice.Product2Id = p.Id;
        standardPrice.UnitPrice = 1;
        standardPrice.IsActive = true;
        standardPrice.UseStandardPrice = false;
        insert standardPrice ;    
        
        Pricebook2 customPB = new Pricebook2(Name='Custom Pricebook', isActive=true);
        insert customPB;
        
        PricebookEntry pbe = [ SELECT Id,Product2Id,Pricebook2Id,UnitPrice FROM PricebookEntry WHERE  isActive=true LIMIT 1 ];
    
        Order od = new Order();
        od.Name = 'Test';
        od.AccountId = a.Id;
        od.status = 'Draft'; 
        od.Your_Order_Reference__c = '123';
        od.EffectiveDate = system.today();
        insert od;
        
        Invoice__c i = new Invoice__c();
        i.Account__c = a.Id;
        i.Contact__c = c.Id;
        i.Order__c = od.Id;
        i.Your_Reference__c =  od.Your_Order_Reference__c;
        insert i;
        
        Delivery_Notes__c d = new Delivery_Notes__c();
        d.Account__c = a.id;
        d.Contact__c = c.Id;
        d.Your_Reference__c =  od.Your_Order_Reference__c;
        d.Order__c = od.Id;
        insert d;
        
         test.StartTest();
        od.Status = 'Closed Won';
        system.debug('Test od.Status------>'+od.Status);
        if(od.Status == 'Closed Won' && od.Invoice__r.size() == 0){
           Invoice__c i2 = new Invoice__c();
           system.debug('Invoice__C Created---->'+i2);
        }
      /*  else if(od.Status != 'Closed Won' && od.Invoice__r.size() >= 0)
        {
            system.debug('Error');
        }*/
        
           if(od.Status == 'Closed Won' && od.Delivery_Notes__r.size() == 0 ){
               Delivery_Notes__c d1 = new Delivery_Notes__c(); 
           }
          update od;
         test.StopTest();
    }
    
    
        public static testMethod void testManipulateOrders1(){
            Account a = new Account();
        a.Name = 'Test Account';
        a.Price_Book__c = '01s8E000000DOci';
        insert a;
        
        Contact c = new Contact();
        c.LastName='test';
        insert c;

        Product2 p = new Product2();
        p.Name = ' Test Product ';
        p.Description='Test Product Entry 1';
        p.productCode = 'ABC';
        p.isActive = true;
        p.Family = 'Blackbox'; 
        insert p;

        Pricebook2  standardPb = [select id, name, isActive from Pricebook2 where IsStandard = true limit 1];
    
        PricebookEntry standardPrice = new PricebookEntry();
        standardPrice.Pricebook2Id = standardPb.Id;
        standardPrice.Product2Id = p.Id;
        standardPrice.UnitPrice = 1;
        standardPrice.IsActive = true;
        standardPrice.UseStandardPrice = false;
        insert standardPrice ;    
        
        Pricebook2 customPB = new Pricebook2(Name='Custom Pricebook', isActive=true);
        insert customPB;
        
        PricebookEntry pbe = [ SELECT Id,Product2Id,Pricebook2Id,UnitPrice FROM PricebookEntry WHERE  isActive=true LIMIT 1 ];
    
        Order od = new Order();
        od.Name = 'Test';
        od.AccountId = a.Id;
        od.status = 'Draft'; 
        od.Your_Order_Reference__c = '123';
        od.EffectiveDate = system.today();
        insert od;
        
        Invoice__c i = new Invoice__c();
        i.Account__c = a.Id;
        i.Contact__c = c.Id;
        i.Order__c = od.Id;
        i.Your_Reference__c =  od.Your_Order_Reference__c;
        insert i;
        
        Delivery_Notes__c d = new Delivery_Notes__c();
        d.Account__c = a.id;
        d.Contact__c = c.Id;
        d.Your_Reference__c =  od.Your_Order_Reference__c;
        d.Order__c = od.Id;
        insert d;
        
         test.StartTest();
        od.Status = 'Draft';
        system.debug('Test od.Status------>'+od.Status);
        if(od.Status != 'Closed Won' && od.Invoice__r.size() >= 0){
           system.debug('Error');
        }
      
           if(od.Status != 'Closed Won' && od.Delivery_Notes__r.size() >= 0 ){
           system.debug('Error');
           }
          update od;
         test.StopTest();
        }


}

My trigger is:
Invoice__c newInvoice1 = new Invoice__c();
            
        System.debug('New Inovice Is Created');
            
        // newInvoice.Name ='Invoice';
         newInvoice1.Account__c = o.AccountId;
         newInvoice1.Order__c= o.Id;
         newInvoice1.Your_Reference__c= o.Your_Order_Reference__c;
         newInvoice1.Contact__c= o.Contact__c;

        // newInvoice.Status__c = 'Pending';
        // newInvoice.Pricebook2Id = q.Pricebook2Id;

       insert newInvoice1;
       System.debug('Invoices Created with data'+newInvoice1);


I am not able to cover these statements in my test clss

Thanks & Regrads,
Utz