EasyMock createStrictMock - EasyMock教程

EasyMock.createStrictMock()创建的模拟,也需要关心的方法的顺序调用模拟会在作出其行动的适当时机。

语法

calcService = EasyMock.createStrictMock(CalculatorService.class);

示例

创建一个接口CalculatorService,其目的是提供各种计算相关的功能。

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);
}

创建一个Java类用来表示MathApplication。

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);
   }
}

让我们来测试MathApplication类,通过它注入CalculatorService作一个模拟。Mock将由EasyMock创建。

在这里,我们已经添加了两个模拟方法调用,add()和subtract()来模拟对象,通过expect()。但在测试过程中,我们调用Add()方法前调用subtract()。当我们创建一个使用EasyMock.createStrictMock()的模拟对象,以便执行方法。

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.createStrictMock(CalculatorService.class);
      mathApplication.setCalculatorService(calcService);
   }

   @Test
   public void testAddAndSubstract(){
      //add the behavior to add numbers
      EasyMock.expect(calcService.add(20.0,10.0)).andReturn(30.0);
      //subtract the behavior to subtract numbers
      EasyMock.expect(calcService.subtract(20.0,10.0)).andReturn(10.0);
      //activate the mock
      EasyMock.replay(calcService);    
      //test the substract functionality
      Assert.assertEquals(mathApplication.subtract(20.0, 10.0),10.0,0);
      //test the add functionality
      Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);
      //verify call to calcService is made or not
      EasyMock.verify(calcService);
   }
}

创建一个Java类在文件夹 C:\ > EasyMock_WORKSPACE 执行测试用例

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());
   }
}

验证结果

使用javac编译如下类

C:\EasyMock_WORKSPACE>javac MathApplicationTester.java

现在运行测试运行看结果

C:\EasyMock_WORKSPACE>java TestRunner

验证输出

testAddAndSubstract(com.yiibai.mock.MathApplicationTester): 
  Unexpected method call CalculatorService.subtract(20.0, 10.0):
    CalculatorService.add(20.0, 10.0): expected: 1, actual: 0
false
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