EasyMock - 第一應用

在深入瞭解 EasyMock 框架的細節之前，我們先來看一個實際應用。在此示例中，我們建立了 Stock Service 的模擬以獲取一些股票的假冒價格，並對一個名為 Portfolio 的 java 類進行了單元測試。

該過程如下以分步方式討論。

示例

步驟 1：建立一個 JAVA 類來表示股票

檔案：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;
   }
}

步驟 2：建立一個 StockService 介面來獲取股票的價格。

檔案：StockService.java

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

步驟 3：建立一個 Portfolio 類來表示任何客戶的投資組合。

檔案：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;
   }
}

步驟 4：測試 Portfolio 類

透過注入一個模擬的 stockservice 來測試 Portfolio 類。EasyMock 將建立模擬。

檔案：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;
   }
}

步驟 5：驗證結果

使用 javac 編譯器按如下方式編譯類 −

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

現在執行 PortfolioTester 以檢視結果 −

C:\EasyMock_WORKSPACE>java PortfolioTester

輸出

驗證輸出

pass