EasyMock -createNiceMock

EasyMock.createNiceMock() 创建一个模拟并将模拟的每个方法的默认实现进行了设置。如果使用了 EasyMock.createMock()，则调用模拟方法会引发断言错误。

语法

calcService = EasyMock.createNiceMock(CalculatorService.class);

示例

步骤 1：创建一个名为 CalculatorService 的接口来提供数学函数。

文件：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);
}

步骤 2：创建一个 JAVA 类来表示 MathApplication

文件：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);
   }
}

步骤 3：测试 MathApplication 类

让我们来测试 MathApplication 类，通过为它注入一个 calculatorService 的模拟。模拟将由 EasyMock 创建。

这里我们通过 expect() 添加了一个模拟方法调用 add()。然而在测试期间，我们也调用了 subtract() 和其他方法。当我们使用 EasyMock.createNiceMock() 创建一个模拟对象时，默认实现和默认值都可用。

文件：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);
   }
}

步骤 4：执行测试用例

在C:\> EasyMock_WORKSPACE中创建一个名为 TestRunner 的 java 类文件来执行测试用例。

文件：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());
   }
}

步骤 5：验证结果

使用 javac 编译器编译类，如下所示 −

C:\EasyMock_WORKSPACE>javac MathApplicationTester.java

现在运行 Test Runner 来查看结果 −

C:\EasyMock_WORKSPACE>java TestRunner

输出

验证输出。

true