EasyMock -createNiceMock

EasyMock.createNiceMock() 建立一個模擬並將模擬的每個方法的預設實現進行了設定。如果使用了 EasyMock.createMock()，則呼叫模擬方法會引發斷言錯誤。

語法

calcService = EasyMock.createNiceMock(CalculatorService.class);

示例

步驟 1：建立一個名為 CalculatorService 的介面來提供數學函式。

檔案：CalculatorService.java

public interface CalculatorService {
   public double add(double input1, double input2);
   public double subtract(double input1, double input2);
   public double multiply(double input1, double input2);
   public double divide(double input1, double input2);
}

步驟 2：建立一個 JAVA 類來表示 MathApplication

檔案：MathApplication.java

public class MathApplication {
   private CalculatorService calcService;
   public void setCalculatorService(CalculatorService calcService){
      this.calcService = calcService;
   }
   public double add(double input1, double input2){
      return calcService.add(input1, input2);		
   }
   public double subtract(double input1, double input2){
      return calcService.subtract(input1, input2);
   }
   public double multiply(double input1, double input2){
      return calcService.multiply(input1, input2);
   }
   public double divide(double input1, double input2){
      return calcService.divide(input1, input2);
   }
}

步驟 3：測試 MathApplication 類

讓我們來測試 MathApplication 類，透過為它注入一個 calculatorService 的模擬。模擬將由 EasyMock 建立。

這裡我們透過 expect() 添加了一個模擬方法呼叫 add()。然而在測試期間，我們也呼叫了 subtract() 和其他方法。當我們使用 EasyMock.createNiceMock() 建立一個模擬物件時，預設實現和預設值都可用。

檔案：MathApplicationTester.java

import org.easymock.EasyMock;
import org.easymock.EasyMockRunner;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(EasyMockRunner.class)
public class MathApplicationTester {
   private MathApplication mathApplication;
   private CalculatorService calcService;

   @Before
   public void setUp(){
      mathApplication = new MathApplication();
      calcService = EasyMock.createNiceMock(CalculatorService.class);
      mathApplication.setCalculatorService(calcService);
   }
   @Test
   public void testCalcService(){
      //add the behavior to add numbers
      EasyMock.expect(calcService.add(20.0,10.0)).andReturn(30.0);
      
      //activate the mock
      EasyMock.replay(calcService);	
      
      //test the add functionality
      Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);
      
      //test the subtract functionality
      Assert.assertEquals(mathApplication.subtract(20.0, 10.0),0.0,0);
      
      //test the multiply functionality
      Assert.assertEquals(mathApplication.divide(20.0, 10.0),0.0,0);		
      
      //test the divide functionality
      Assert.assertEquals(mathApplication.multiply(20.0, 10.0),0.0,0);

      //verify call to calcService is made or not
      EasyMock.verify(calcService);
   }
}

步驟 4：執行測試用例

在C:\> EasyMock_WORKSPACE中建立一個名為 TestRunner 的 java 類檔案來執行測試用例。

檔案：TestRunner.java

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class TestRunner {
   public static void main(String[] args) {
      Result result = JUnitCore.runClasses(MathApplicationTester.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
}

步驟 5：驗證結果

使用 javac 編譯器編譯類，如下所示 −

C:\EasyMock_WORKSPACE>javac MathApplicationTester.java

現在執行 Test Runner 來檢視結果 −

C:\EasyMock_WORKSPACE>java TestRunner

輸出

驗證輸出。

true