EasyMock-添加行为 - 芒果文档

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📜 EasyMock-添加行为

📅 最后修改于: 2020-11-18 09:12:18 🧑 作者: Mango

EasyMock的使用方法预期()和expectLassCall()增加了一个功能，以模拟对象。看一下下面的代码片段。

//add the behavior of calc service to add two numbers
EasyMock.expect(calcService.add(10.0,20.0)).andReturn(30.00);

在这里，我们指示EasyMock给出将calcService的add方法添加10和20的行为，并因此返回30.00的值。

此时，Mock只是记录了行为，但它不能作为模拟对象。调用重放后，它可以按预期工作。

//add the behavior of calc service to add two numbers
EasyMock.expect(calcService.add(10.0,20.0)).andReturn(30.00);

//activate the mock
//EasyMock.replay(calcService);

没有EasyMock.Replay()的示例

步骤1：创建一个名为CalculatorService的接口以提供数学函数

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

让我们通过向其注入一个CalculatorService模拟来测试MathApplication类。模拟将由EasyMock创建。

文件：MathApplicationTester.java

import org.easymock.EasyMock;
import org.easymock.EasyMockRunner;
import org.easymock.Mock;
import org.easymock.TestSubject;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

//@RunWith attaches a runner with the test class to initialize the test data
@RunWith(EasyMockRunner.class)
public class MathApplicationTester {
    
   // @TestSubject annotation is used to identify the class which is going to use the mock object
   @TestSubject
   MathApplication mathApplication = new MathApplication();

   //@Mock annotation is used to create the mock object to be injected
   @Mock
   CalculatorService calcService;

   @Test
   public void testAdd(){
      
      //add the behavior of calc service to add two numbers
      EasyMock.expect(calcService.add(10.0,20.0)).andReturn(30.00);

      //activate the mock
      //EasyMock.replay(calcService);    
        
      //test the add functionality
      Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0);
   }
}

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，以执行测试用例。

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 Calculator Service.java Math Application.java Math Application Tester.java Test Runner.java

现在运行测试运行器以查看结果：

C:\EasyMock_WORKSPACE>java TestRunner

验证输出。

testAdd(MathApplicationTester): expected:<0.0> but was:<30.0>
false

EasyMock.Replay()的示例

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