tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/internal/databinding/internal/beans/JavaBeanObservableValueTest.java

/*******************************************************************************
 * Copyright (c) 2006 Brad Reynolds and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Brad Reynolds - initial API and implementation
 *     Brad Reynolds - bug 171616
 ******************************************************************************/

package org.eclipse.jface.tests.internal.databinding.internal.beans;

import java.beans.PropertyDescriptor;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.internal.databinding.internal.beans.JavaBeanObservableValue;
import org.eclipse.jface.tests.databinding.AbstractDefaultRealmTestCase;
import org.eclipse.jface.tests.databinding.util.EventTrackers.ValueChangeEventTracker;

/**
 * @since 3.2
 */
public class JavaBeanObservableValueTest extends AbstractDefaultRealmTestCase {
	private Bean bean;
	private JavaBeanObservableValue observableValue;
	private PropertyDescriptor propertyDescriptor;
	private String propertyName;
	
	/* (non-Javadoc)
	 * @see junit.framework.TestCase#setUp()
	 */
	protected void setUp() throws Exception {
		super.setUp();
		
		bean = new Bean();
		propertyName = "value";
		propertyDescriptor = new PropertyDescriptor(propertyName, Bean.class);
		observableValue = new JavaBeanObservableValue(Realm.getDefault(), bean, propertyDescriptor, String.class);
	}
	
    public void testSetsValueInBean() throws Exception {
        String value = "value";
        assertNull(observableValue.getValue());
        observableValue.setValue(value);
        assertEquals("value", value, observableValue.getValue());
    }
    
    public void testGetObserved() throws Exception {
    	assertEquals(bean, observableValue.getObserved());
	}
    
    public void testGetPropertyDescriptor() throws Exception {
    	assertEquals(propertyDescriptor, observableValue.getPropertyDescriptor());
	}
    
    public void testRegistersListenerAfterFirstListenerIsAdded() throws Exception {
		assertFalse(bean.changeSupport.hasListeners(propertyName));
		observableValue.addValueChangeListener(new ValueChangeEventTracker());
		assertTrue(bean.changeSupport.hasListeners(propertyName));
	}
    
    public void testRemovesListenerAfterLastListenerIsRemoved() throws Exception {
    	ValueChangeEventTracker listener = new ValueChangeEventTracker();
		observableValue.addValueChangeListener(listener);
		
		assertTrue(bean.changeSupport.hasListeners(propertyName));
		observableValue.removeValueChangeListener(listener);
		assertFalse(bean.changeSupport.hasListeners(propertyName));
	}
    
    public void testFiresValueChangeEvents() throws Exception {
    	ValueChangeEventTracker listener = new ValueChangeEventTracker();
    	observableValue.addValueChangeListener(listener);
    	
    	assertEquals(0, listener.count);
    	bean.setValue(bean.getValue() + bean.getValue());
    	assertEquals(1, listener.count);
	}
}