Expert adviser works in real time, But it has a problem when running on strategy tester

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Hi guys, I hope you doing well. I wrote an EA which is more complicated than this below, But as an example in the below code, I used ADX to get signals, when it's running on real time it works perfectly, But when I want to back test, It doesn't actually works, Then the strategy tester doesn't move at all, I noticed that the problem must be about the code not the MT4, because I can test any other EA in it as well, So i want to know if the problem is about code, and how can I fix it? 

Here is the code

I really appreciate your help & your time for solve it, Thanks in advance.

input int risk=5;             //Risk Amount In Percent

//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void OnTick()
  {
//+------------------------------------------------------------------+
//|Lot Calculation                                                         |
//+------------------------------------------------------------------+
   double balance=AccountInfoDouble(ACCOUNT_BALANCE);
   int leverage=AccountInfoInteger(ACCOUNT_LEVERAGE);
   int Currency_Lot=100000;
   double balnace_=(balance*risk)/100;
   double leverage_=balnace_*leverage;
   double ask=SymbolInfoDouble(Symbol(),SYMBOL_ASK);
   double lot_=ask*Currency_Lot;
   double lot= leverage_/lot_;
   lot=NormalizeDouble(lot,2);
//+------------------------------------------------------------------+
//|Opening positions                                                 |
//+------------------------------------------------------------------+
   if(ADX()=="Signal Buy")
      close(2020);
   if(ADX()=="Signal Sell")
      close(1010);

   if(iVolume(Symbol(),PERIOD_CURRENT,0)<=1 && Orders()==0)
     {
      if(ADX()=="Signal Buy")
         int Ticketbuy=OrderSend(Symbol(),OP_BUY,lot,Ask,5,0,0,"We Got a Buy Position",1010,0,clrGreen);
      if(ADX()=="Signal Sell")
         int Ticketsell=OrderSend(Symbol(),OP_SELL,lot,Bid,5,0,0,"We Got a Sell Position",2020,0,clrRed);
     }

  }
//+------------------------------------------------------------------+
//| Check Adx Signal
//+------------------------------------------------------------------+
string ADX()
  {

   double Adx_PDI1= iADX(NULL,PERIOD_CURRENT,14,PRICE_CLOSE,1,1); // DI+ For Candle Number 1
   double Adx_MDI1= iADX(NULL,PERIOD_CURRENT,14,PRICE_CLOSE,2,1); // DI- For Candle Number 1
   double Adx_PDI2= iADX(NULL,PERIOD_CURRENT,14,PRICE_CLOSE,1,0); // DI+ For Candle Number 0
   double Adx_MDI2= iADX(NULL,PERIOD_CURRENT,14,PRICE_CLOSE,2,0); // DI+ For Candle Number 0
   
   if(Adx_MDI2>Adx_PDI2 && Adx_MDI1<Adx_PDI1)
     {
      return("Signal Buy");
     }
   else
      if(Adx_MDI2<Adx_PDI2 && Adx_MDI1>Adx_PDI1)
        {
         return("Signal Sell");
        }
   return("No Signal");
  }


//+------------------------------------------------------------------+
//|Select Positions
//+------------------------------------------------------------------+
int Orders()
  {
   int num=0;
   for(int i= OrdersTotal()-1; i>=0; i++)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderMagicNumber()==1010 || OrderMagicNumber()==2020)
            num++;
        }
     }
   return(num);

  }


//+------------------------------------------------------------------+
//|Closing Positions
//+------------------------------------------------------------------+
void close(int Magic)
  {
   for(int i= OrdersTotal()-1; i>=0; i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderMagicNumber()==Magic)
            bool abc= OrderClose(OrderTicket(),OrderLots(),OrderClosePrice(),5,clrRed);
        }
     }
  }
//+------------------------------------------------------------------+
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