EasyMock - Primeiro Aplicativo

Antes de entrar nos detalhes do EasyMock Framework, vamos ver um aplicativo em ação. Neste exemplo, criamos um mock de Stock Service para obter o preço simulado de algumas ações e uma unidade testada em uma classe java chamada Portfolio.

O processo é discutido abaixo de uma maneira passo a passo.

Step 1: Create a JAVA class to represent the Stock

Arquivo: 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

Arquivo: StockService.java

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

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

Arquivo: 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