Easymock 简明教程

EasyMock - createStrictMock

EasyMock.createStrictMock() 创建一个模拟，并处理模拟在执行其动作时将要进行的方法调用的顺序。

Syntax

calcService = EasyMock.createStrictMock(CalculatorService.class);

Example

Step 1: Create an interface called CalculatorService to provide mathematical functions

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);
}

Step 2: Create a JAVA class to represent 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);
   }
}

Step 3: Test the MathApplication class

让我们测试 MathApplication 类，并注入一个 calculatorService 模拟。模拟将由 EasyMock 创建。

这里我们通过 expect() 向 mock 对象添加了两个模拟方法调用，add() 和 subtract()。然而，在测试期间，我们在调用 add() 之前调用了 subtract()。当我们使用 EasyMock.createStrictMock() 创建模拟对象时，方法执行顺序非常重要。

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.createStrictMock(CalculatorService.class);
      mathApplication.setCalculatorService(calcService);
   }
   @Test
   public void testAddAndSubtract(){
      //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 subtract 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);
   }
}

Step 4: Execute test cases

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());
   }
}

Step 5: Verify the Result

使用以下 javac 编译器编译类：

C:\EasyMock_WORKSPACE>javac MathApplicationTester.java

现在运行测试运行器以查看结果 −

C:\EasyMock_WORKSPACE>java TestRunner

Output

验证输出。

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