第一个应用程序（ First Application）

在进入EasyMock Framework的详细信息之前，让我们看一下应用程序的运行情况。 在这个例子中，我们已经创建了一个模拟股票服务来获得一些股票的虚拟价格，并且单元测试了一个名为Portfolio的java类。

下面以逐步的方式讨论该过程。

Step 1: Create a JAVA class to represent the Stock

File: 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

File: StockService.java

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

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

File: Portfolio.java

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

Step 4: Test the Portfolio class

让我们通过在其中注入一个库存服务的模拟来测试Portfolio类。 Mock将由EasyMock创建。

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

使用javac编译器编译类，如下所示:

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

现在运行PortfolioTester来查看结果:

C:\EasyMock_WORKSPACE>java PortfolioTester

验证输出

pass