EasyMock - Aggiunta di comportamento

EasyMock aggiunge una funzionalità a un oggetto fittizio utilizzando i metodi expect() e expectLassCall(). Dai un'occhiata al seguente frammento di codice.

//add the behavior of calc service to add two numbers
EasyMock.expect(calcService.add(10.0,20.0)).andReturn(30.00);

Qui abbiamo incaricato EasyMock di dare un comportamento di aggiunta di 10 e 20 al metodo di aggiunta di calcService e, di conseguenza, di restituire il valore di 30.00.

A questo punto, Mock ha semplicemente registrato il comportamento ma non funziona come un oggetto fittizio. Dopo aver chiamato replay, funziona come previsto.

//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);

Esempio senza EasyMock.Replay ()

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

Testiamo la classe MathApplication, inserendovi una simulazione di calculatorService. Mock sarà creato da EasyMock.

File: 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);
   }
}

Step 4: Execute test cases

Crea un file di classe java denominato TestRunner in C:\>EasyMock_WORKSPACE per eseguire il / i test case.

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

Compila le classi usando javac compilatore come segue:

C:\EasyMock_WORKSPACE>javac Calculator Service.java Math Application.java Math Application Tester.java Test Runner.java

Ora esegui il Test Runner per vedere il risultato:

C:\EasyMock_WORKSPACE>java TestRunner

Verifica l'output.

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

Esempio con EasyMock.Replay ()

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