Tips on how to design Commerce Place Calculator or Threat Engine in Java? Software program Design Drawback Answer Instance

import org.junit.Ignore;
import java.util.Iterator;
import java.util.Checklist;
import java.util.ArrayList;
import org.junit.Take a look at;
import static org.junit.Assert.;

public class PositionManagerTest {
   
    public PositionManagerTest() {
    }
   
    @Ignore
    public void testGetRealTimePosition() {
        assertEquals(1, 1);
    }

    @Take a look at
    public void testGetPositionForAccountAndSecurity() {
        PositionManager pMgr = new PositionManager();
        Checklist<Commerce> tradeStream = createTrades();
       
        Iterator<Commerce> itr = tradeStream.iterator();
       
        whereas(itr.hasNext()) {
            pMgr.course of(itr.subsequent());
            itr.take away();
        }
       
        assertEquals(200, pMgr.getPositionForAccountAndSecurity("ACC-101", "MSFT"));
        assertEquals(150, pMgr.getPositionForAccountAndSecurity("ACC-102", "INFY"));
        assertEquals(250, pMgr.getPositionForAccountAndSecurity("ACC-103", "REP"));
        assertEquals(150, pMgr.getPositionForAccountAndSecurity("ACC-104", "HKJ"));
        assertEquals(200, pMgr.getPositionForAccountAndSecurity("ACC-105", "FVE"));
        assertEquals(50,  pMgr.getPositionForAccountAndSecurity("ACC-105", "AMZ"));
        assertEquals(150, pMgr.getPositionForAccountAndSecurity("ACC-106", "ABC"));
        assertEquals(-50, pMgr.getPositionForAccountAndSecurity("ACC-107", "META"));
        assertEquals(200, pMgr.getPositionForAccountAndSecurity("ACC-108", "OLA"));
        assertEquals(200, pMgr.getPositionForAccountAndSecurity("ACC-109", "BCD"));
        assertEquals(-200,pMgr.getPositionForAccountAndSecurity("ACC-110", "BCD"));
        assertEquals(100, pMgr.getPositionForAccountAndSecurity("ACC-111", "EFG"));
        assertEquals(0, pMgr.getPositionForAccountAndSecurity("ACC-112", "BES"));
        assertEquals(0, pMgr.getPositionForAccountAndSecurity("ACC-113", "KBC"));
       
        //validate the entire variety of trades
       
        //validate right account comprise right trades
       
    }
   
 
    personal Checklist<Commerce> createTrades(){
        Checklist<Commerce> trades = new ArrayList<Commerce>();
       
        //easy increment
        trades.add(new Commerce(5001,"ACC-101", 1, "MSFT", 100,
                Path.BUY, Operation.NEW));
        trades.add(new Commerce(5002,"ACC-101", 1, "MSFT", 100, 
                Path.BUY, Operation.NEW));
               
        //easy increment for one more safety
        trades.add(new Commerce(5003,"ACC-102", 1, "INFY", 50,  
                Path.BUY, Operation.NEW));
        trades.add(new Commerce(5004,"ACC-102", 1, "INFY", 100, 
                Path.BUY, Operation.NEW));
       
        //easy  NEW - AMEND - NEW (amount)
        trades.add(new Commerce(5005,"ACC-103", 1, "REP", 100,  
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5005,"ACC-103", 2, "REP", 50, 
            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5006,"ACC-103", 1, "REP", 200, 
            Path.BUY, Operation.NEW));
       
        //simpel BUY SELL BUY State of affairs
        trades.add(new Commerce(5007, "ACC-104", 1, "HKJ", 100,  
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5008, "ACC-104", 1, "HKJ", 50, 
            Path.SELL, Operation.NEW));
        trades.add(new Commerce(5009, "ACC-104", 1, "HKJ", 100, 
            Path.BUY, Operation.NEW));
       
        //safety modification state of affairs
        trades.add(new Commerce(5010, "ACC-105", 1, "FVE", 100,  
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5010, "ACC-105", 2, "AMZ", 50, 
            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5011, "ACC-105", 1, "FVE", 200, 
            Path.BUY, Operation.NEW));
       
        //path modification state of affairs
        trades.add(new Commerce(5012, "ACC-106", 1, "ABC", 100, 
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5012, "ACC-106", 2, "ABC", 50, 
            Path.SELL, Operation.AMEND));
        trades.add(new Commerce(5014, "ACC-106", 1, "ABC", 200, 
            Path.BUY, Operation.NEW));
       
        //safety + path modification state of affairs
        trades.add(new Commerce(5015, "ACC-107", 1, "OLA", 100,  
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5015, "ACC-107", 2, "META", 50, 
            Path.SELL, Operation.AMEND));
        trades.add(new Commerce(5016, "ACC-108", 1, "OLA", 200, 
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5016, "ACC-108", 2, "META", 50, 
            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5016, "ACC-108", 3, "OLA", 200, 
            Path.BUY, Operation.AMEND));
      
       
        //identical safety - one accoutn sale different purchase
        trades.add(new Commerce(5017, "ACC-109", 1, "BCD", 200, 
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5018, "ACC-110", 2, "BCD", 200, 
            Path.SELL, Operation.NEW));
       
        //identical safety - a number of amendments on amount
        trades.add(new Commerce(5019, "ACC-111", 1, "EFG", 50, 
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5019, "ACC-111", 2, "EFG", 200, 
            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5019, "ACC-111", 3, "EFG", 250, 
            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5019, "ACC-111", 4, "EFG", 100, 
            Path.BUY, Operation.AMEND));
       
       
        //Similar Safety - NEW MOD CANCEL take a look at
        trades.add(new Commerce(5020, "ACC-112", 1, "BES", 50, 
            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5020, "ACC-112", 2, "BES", 200, 

            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5020, "ACC-112", 3, "BES", 200, 

            Path.BUY, Operation.CANCEL));
       
       
        //outofsequence commerce occasions
        trades.add(new Commerce(5019, "ACC-113", 1, "KBC", 100, 

            Path.BUY, Operation.NEW));
        trades.add(new Commerce(5019, "ACC-113", 2, "KBC", 150, 

            Path.BUY, Operation.AMEND));
        trades.add(new Commerce(5019, "ACC-113", 4, "KBC", 150, 

            Path.BUY, Operation.CANCEL));
        trades.add(new Commerce(5019, "ACC-113", 3, "KBC", 250, 

            Path.BUY, Operation.AMEND));
       
        return trades;
    }
}