EasyMock - JUnit 集成



在本章中,我们将学习如何将 JUnit 和 EasyMock 集成在一起。在此处,我们将创建一个数学应用程序,它使用 CalculatorService 来执行基本的数学运算,例如加法、减法、乘法和除法。我们将使用 EasyMock 来模拟 CalculatorService 的虚拟实现。此外,我们大量使用了注解来说明它们与 JUnit 和 EasyMock 的兼容性。

示例

此过程在下面按步骤进行讨论。

步骤 1:创建一个名为 CalculatorService 的界面来提供数学函数

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

我们通过注入 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 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:创建一个类来执行测试用例。

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 编译器编译这些类,如下所示 −

C:\EasyMock_WORKSPACE>javac CalculatorService.java MathApplication.java MathApplicationTester.java TestRunner.java

现在运行测试运行器以查看结果 −

C:\EasyMock_WORKSPACE>java TestRunner

输出

验证输出。

true

要了解有关 JUnit 的详细信息,请参阅 Tutorials Point 上的 JUnit 教程。

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