Android Open Source - TipOnDiscount Data Model Observable Tests

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License

The source code is released under:

GNU General Public License

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Java Source Code

// Copyright 2011-2012 David A. Greenbaum
/*//from ww w.j av a2  s. co m
This file is part of Tip On Discount.

Tip On Discount is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

Tip On Discount is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with Tip On Discount.  If not, see <http://www.gnu.org/licenses/>.
*/

/** This JUnit test harness check that the DataModelObservable
 * class sends update notifications to all registered observers.
 */

package com.itllp.tipOnDiscount.model;

import java.math.BigDecimal;

import org.jmock.Expectations;
import org.jmock.integration.junit4.JUnitRuleMockery;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import com.itllp.tipOnDiscount.model.impl.DataModelImpl;
import com.itllp.tipOnDiscount.model.update.BillTotalUpdate;
import com.itllp.tipOnDiscount.model.update.Update;

public class DataModelObservableTests {
  @Rule public JUnitRuleMockery context = new JUnitRuleMockery();
  private DataModelObservable observable = null;

  
  @Before
  public void initialize() {
    observable = new DataModelObservable();
  }

  
  @Test 
  public void testUpdateOfOneObserver() {
    // Preconditions
    final DataModelObserver observer = context.mock(DataModelObserver.class);
    final DataModel model = new DataModelImpl();
    final Update update = new BillTotalUpdate(new BigDecimal("0.00"));
    observable.addObserver(observer);
    
    // Postconditions
    context.checking(new Expectations() {{
      oneOf (observer).update(model, update);      
    }});
    
    // Method under test
    observable.notifyObservers(model, update);
  }

  
  @Test 
  public void testUpdateOfDeregisteredObserver() {
    // Preconditions
    final DataModelObserver observer = context.mock(DataModelObserver.class);
    final Update update = new BillTotalUpdate(new BigDecimal("0.00"));
    observable.addObserver(observer);
    observable.deleteObserver(observer);
    
    // Postconditions
    context.checking(new Expectations() {{
      never (observer).update(with(any(DataModelImpl.class)), with(equal(update)));      
    }});
    
    // Method under test
    observable.notifyObservers(null, update);
  }

  
  @Test 
  public void testUpdateOfTwoObservers() {
    // Preconditions
    final DataModelObserver observer1 = context.mock(DataModelObserver.class, "1");
    final DataModelObserver observer2 = context.mock(DataModelObserver.class, "2");
    final DataModel model = new DataModelImpl();
    final Update update = new BillTotalUpdate(new BigDecimal("0.00"));
    observable.addObserver(observer1);
    observable.addObserver(observer2);
    
    // Postconditions
    context.checking(new Expectations() {{
      oneOf (observer1).update(model, update);      
      oneOf (observer2).update(model, update);      
    }});
    
    // Method under test
    observable.notifyObservers(model, update);
  }

  
  
}

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