EasyMock - 添加行为

EasyMock 使用 expect() 和 expectLastCall() 方法为模拟对象添加功能。请看下面的代码片段。

//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 为 calcService 的 add 方法添加 10 和 20 的行为，并返回 30.00 的值。

此时，Mock 只记录了行为，但它并未作为模拟对象工作。调用 replay 后，它按预期工作。

//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);

无 EasyMock.Replay() 的示例

步骤 1：创建一个名为 CalculatorService 的接口，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

让我们通过向其中注入 calculatorService 的模拟来测试 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 Calculator Service.java Math Application.java Math Application Tester.java Test Runner.java

现在运行 Test Runner 查看结果：

C:\EasyMock_WORKSPACE>java TestRunner

输出

验证输出。

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

包含 EasyMock.Replay() 的示例

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