BusinessDelegateTest.java

/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.business.delegate;

import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

import org.junit.Before;
import org.junit.Test;

/**
 * The Business Delegate pattern adds an abstraction layer between the presentation and business
 * tiers. By using the pattern we gain loose coupling between the tiers. The Business Delegate
 * encapsulates knowledge about how to locate, connect to, and interact with the business objects
 * that make up the application.
 * 
 * <p>Some of the services the Business Delegate uses are instantiated directly, and some can be
 * retrieved through service lookups. The Business Delegate itself may contain business logic too
 * potentially tying together multiple service calls, exception handling, retrying etc.
 */
public class BusinessDelegateTest {

  private EjbService ejbService;

  private JmsService jmsService;

  private BusinessLookup businessLookup;

  private BusinessDelegate businessDelegate;

  /**
   * This method sets up the instance variables of this test class. It is executed before the
   * execution of every test.
   */
  @Before
  public void setup() {
    ejbService = spy(new EjbService());
    jmsService = spy(new JmsService());

    businessLookup = spy(new BusinessLookup());
    businessLookup.setEjbService(ejbService);
    businessLookup.setJmsService(jmsService);

    businessDelegate = spy(new BusinessDelegate());
    businessDelegate.setLookupService(businessLookup);
  }

  /**
   * In this example the client ({@link Client}) utilizes a business delegate (
   * {@link BusinessDelegate}) to execute a task. The Business Delegate then selects the appropriate
   * service and makes the service call.
   */
  @Test
  public void testBusinessDelegate() {

    // setup a client object
    Client client = new Client(businessDelegate);

    // set the service type
    businessDelegate.setServiceType(ServiceType.EJB);

    // action
    client.doTask();

    // verifying that the businessDelegate was used by client during doTask() method.
    verify(businessDelegate).doTask();
    verify(ejbService).doProcessing();

    // set the service type
    businessDelegate.setServiceType(ServiceType.JMS);

    // action
    client.doTask();

    // verifying that the businessDelegate was used by client during doTask() method.
    verify(businessDelegate, times(2)).doTask();
    verify(jmsService).doProcessing();
  }
}