Mockito-모의 재설정

Mockito는 나중에 재사용 할 수 있도록 mock을 재설정하는 기능을 제공합니다. 다음 코드 스 니펫을 살펴보십시오.

//reset mock
reset(calcService);

여기 모의 객체를 재설정했습니다. MathApplication은 calcService를 사용하고 mock을 재설정 한 후 mocked 메서드를 사용하면 테스트에 실패합니다.

예

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

File: 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

File: 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

CalculatorService의 모의를 삽입하여 MathApplication 클래스를 테스트 해 보겠습니다. Mock은 Mockito에 의해 생성됩니다.

File: MathApplicationTester.java

package com.tutorialspoint.mock;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.mockito.Mockito.reset;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;

// @RunWith attaches a runner with the test class to initialize the test data
@RunWith(MockitoJUnitRunner.class)
public class MathApplicationTester {
	
   private MathApplication mathApplication;
   private CalculatorService calcService;

   @Before
   public void setUp(){
      mathApplication = new MathApplication();
      calcService = mock(CalculatorService.class);
      mathApplication.setCalculatorService(calcService);
   }

   @Test
   public void testAddAndSubtract(){

      //add the behavior to add numbers
      when(calcService.add(20.0,10.0)).thenReturn(30.0);
  
      //test the add functionality
      Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);

      //reset the mock	  
      reset(calcService);

      //test the add functionality after resetting the mock
      Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);   
   }
}

Step 4 − Execute test cases

TestRunner라는 Java 클래스 파일을 만듭니다. C:\> Mockito_WORKSPACE 테스트 케이스를 실행합니다.

File: 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

다음을 사용하여 클래스 컴파일 javac 다음과 같이 컴파일러-

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

이제 Test Runner를 실행하여 결과를 확인하십시오.

C:\Mockito_WORKSPACE>java TestRunner

출력을 확인하십시오.

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