EasyMock - Première application

Avant d'entrer dans les détails du Framework EasyMock, voyons une application en action. Dans cet exemple, nous avons créé une maquette de Stock Service pour obtenir le prix fictif de certaines actions et testé à l'unité une classe Java nommée Portfolio.

Le processus est décrit ci-dessous d'une manière étape par étape.

Step 1: Create a JAVA class to represent the Stock

Fichier: Stock.java

public class Stock {
   private String stockId;
   private String name;	
   private int quantity;

   public Stock(String stockId, String name, int quantity){
      this.stockId = stockId;
      this.name = name;		
      this.quantity = quantity;		
   }

   public String getStockId() {
      return stockId;
   }

   public void setStockId(String stockId) {
      this.stockId = stockId;
   }

   public int getQuantity() {
      return quantity;
   }

   public String getTicker() {
      return name;
   }
}

Step 2: Create an interface StockService to get the price of a stock

Fichier: StockService.java

public interface StockService {
   public double getPrice(Stock stock);
}

Step 3: Create a class Portfolio to represent the portfolio of any client

Fichier: Portfolio.java

import java.util.List;

public class Portfolio {
   private StockService stockService;
   private List
      
        stocks; public StockService getStockService() { return stockService; } public void setStockService(StockService stockService) { this.stockService = stockService; } public List
       
         getStocks() { return stocks; } public void setStocks(List
        
          stocks) { this.stocks = stocks; } public double getMarketValue(){ double marketValue = 0.0; for(Stock stock:stocks){ marketValue += stockService.getPrice(stock) * stock.getQuantity(); } return marketValue; } }

Step 4: Test the Portfolio class

Let's test the Portfolio class, by injecting in it a mock of stockservice. Mock will be created by EasyMock.

File: PortfolioTester.java

import java.util.ArrayList;
import java.util.List;

import org.easymock.EasyMock;

public class PortfolioTester {
   Portfolio portfolio;	
   StockService stockService;

   public static void main(String[] args){
      PortfolioTester tester = new PortfolioTester();
      tester.setUp();
      System.out.println(tester.testMarketValue()?"pass":"fail");
   }

   public void setUp(){
      //Create a portfolio object which is to be tested		
      portfolio = new Portfolio();		
      
      //Create the mock object of stock service
      stockService = EasyMock.createMock(StockService.class);		
      
      //set the stockService to the portfolio
      portfolio.setStockService(stockService);
   }

   public boolean testMarketValue(){
   
      //Creates a list of stocks to be added to the portfolio
      List<Stock> stocks = new ArrayList<Stock>();
      Stock googleStock = new Stock("1","Google", 10);
      Stock microsoftStock = new Stock("2","Microsoft",100);	
      
      stocks.add(googleStock);
      stocks.add(microsoftStock);

      //add stocks to the portfolio
      portfolio.setStocks(stocks);

      // mock the behavior of stock service to return the value of various stocks
      EasyMock.expect(stockService.getPrice(googleStock)).andReturn(50.00);
      EasyMock.expect(stockService.getPrice(microsoftStock)).andReturn(1000.00);		

      // activate the mock
      EasyMock.replay(stockService);		

      double marketValue = portfolio.getMarketValue();		
      return marketValue == 100500.0;
   }
}

Step 5: Verify the result

Compile the classes using javac compiler as follows:

C:\EasyMock_WORKSPACE>javac Stock.java StockService.java Portfolio.java PortfolioTester.java

Now run the PortfolioTester to see the result:

C:\EasyMock_WORKSPACE>java PortfolioTester

Verify the Output

pass