Hi Guys iam new to salesforce can some help me how to create the test class for the wapper calss

public with sharing class PlaceNeworders {

   


public String distributorId { get; set; }
public Order__c theOrder {get; set;}
public Order_Item__c theOrderItem {get; set;}
public List<wrapNewOrder> inventoryList { get; set; }
Public List<Inventory_Item__c> invItems {get;set;}
public Date dateName { get; set; }
public String selectedRestaurantId { get; set; }
public Boolean confirmNewOrderFlag {get; set;}


    public List<selectoption> getRestaurants1() {
        List<selectoption> Options = new List<selectoption>();
        Id accountRecordType = [SELECT Id FROM RecordType WHERE Name = 'Restaurant / Buyer'].Id;
        List <Account> accounts = [Select Name, Id from Account where RecordTypeId = :accountRecordType ];
        for (Account a : accounts)
         options.add(new SelectOption(a.Id, a.Name));
         return Options;
    }
   
   /*  public List<selectoption> getDistributor() {
        List<selectoption> Dist = new List<selectoption>();
        Id accountRecordType = [SELECT Id FROM RecordType WHERE Name = 'Distributor'].Id;
        List <Account> accounts = [Select Name, Id from Account where RecordTypeId = :accountRecordType ];
        Dist.add( new SelectOption('','Select'));
        for (Account a : accounts)
         Dist.add(new SelectOption(a.Id, a.Name));
         return Dist;
    
    }*/


   
     // Inserting the OrderItem into ordefullfilment Page and Navigating to OrderFullfilement page.
    public List<SelectOption> getUnitOrders() {
        List<SelectOption> options = new List<SelectOption>();
              
       Schema.DescribeFieldResult fieldResult =  Order_Item__c.Desired_Units__c.getDescribe();
       List<Schema.PicklistEntry> ple = fieldResult.getPicklistValues();
       
        for( Schema.PicklistEntry f : ple)
        {
          options.add(new SelectOption(f.getLabel(), f.getValue()));
        }      
      
        
        return options;
    }    
   
    public void selectedDistributor() {
        User lgdUsr=[select id,name ,Distributor__c,profileId from User where id=:UserInfo.getUserId()];
      string profileName=[Select Id,Name from Profile where Id=: lgdUsr.profileId].Name;
      inventoryList = new List<wrapNewOrder> ();
   //  set<string>
      if(profileName == 'System Administrator'  ){
            system.debug('@@distributorId'+distributorId);
           
            invItems = [SELECT Id,Cut_and_Size__c,Fresh_Frozen__c,Quantity_Available__c,Species__c,Distributor_Name__c,Price_per_Unit__c,Units__c FROM Inventory_Item__c where Quantity_Available__c > 0 ];
            System.debug('Entered into as system Adminisator'+ invItems + 'assdddddd'+distributorId+'@@Distributor_Name__c'+invItems );
          
          }
      else{
             invItems = [SELECT Id,Cut_and_Size__c,Fresh_Frozen__c,Quantity_Available__c,Species__c,Price_per_Unit__c,Units__c FROM Inventory_Item__c where Distributor_Name__c =: lgdUsr.Distributor__c AND Quantity_Available__c > 0];
          }
    }
   
    // Constructor load the inventory Items to page based on the user profile
   
    Public PlaceNeworders(){
   
    theOrder =new Order__c();
    inventoryList = new List<wrapNewOrder> ();
   
      selectedDistributor();
     
      for(Inventory_Item__c a: invItems) {
                // As each Order is processed we create a new wrapAddOrder object and add it to the inventoryList
                inventoryList.add(new wrapNewOrder(a));
            }
            System.debug(' Print enter'+inventoryList);
   
   
    }





// Insert the order and order items

public PageReference confirmNewOrder() {

  
       if(theOrder.id==null) {
            theOrder.Buyer__c = selectedRestaurantId;
            theOrder.Requested_Delivery_Date__c = datename ;
            insert theOrder;
           
            system.debug('TheOrder inserted'+theOrder);
        }
                         
                         
         List<Order_Item__c> items = new List<Order_Item__c>();
         for(wrapNewOrder wno : inventoryList) {
         
         
                  
            if(wno.selected == true) {
               system.debug('Enter into selected '+wno.selected);
               confirmNewOrderFlag = true ;
               Order_Item__c oItem = new Order_Item__c();
               oItem.Amount_Ordered__c = wno.amount;
               oItem.Comments__c = wno.splInstructions;
               oItem.Desired_Units__c = wno.selectDesiredUnit;
               system.debug('@@oItem.Desired_Units__c'+oItem.Desired_Units__c);
               oItem.Order__c = theOrder.Id;
               oItem.Inventory__c = wno.invItem.Id;
                items.add(oItem);
             
              System.debug('Print Amount'+wno.amount);
              System.debug('Print SpL'+wno.splInstructions);
              System.debug('Print id'+theOrder.Id);
            }
             
        }
         system.debug('Enter confirmNewOrderFlag '+confirmNewOrderFlag);
        if(confirmNewOrderFlag == null){
       
              system.debug('Enter into Not selected loop '+confirmNewOrderFlag) ;
                ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.ERROR,'Please select atleast one item');
                ApexPages.addMessage(msg);
            }
       
        if(items.size()>0){
              
              system.debug('Enter into Not  loop ') ;
              if(theOrder.Requested_Delivery_Date__c == null){
              ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.ERROR,'Enter Requested Delivery Date');
                ApexPages.addMessage(msg);
                }
                else{
              insert items;
              System.debug(' -------item----------- '+ items);
              PageReference orderPage = new PageReference('/apex/'+'/OrderFulfillment2?sfdc.tabName=01rF0000000VOWh');
              orderPage.setRedirect(false);
              return orderPage;
       }
       
    }
       return null;
    }

  public PageReference Cancel() {
     
     PageReference orderItemPage = new PageReference('/apex/'+'/OrderFulfillment2?sfdc.tabName=01rF0000000VOWh');
        orderItemPage.setRedirect(true);
        return orderItemPage;
    }

       // This is our wrapper/container class.
      
         public class wrapNewOrder {
         public Inventory_Item__c invItem {get; set;}
         public Boolean selected {get; set;}
         public String splInstructions { get; set; }
         public Decimal amount { get; set; }
         Public String selectDesiredUnit{get; set;}
       
       

        public wrapNewOrder(Inventory_Item__c a) {
            this.invItem = a;
            this.selectDesiredUnit=a.Units__c;
            this.selected = false;
        }
    }

}