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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
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/*
 * Copyright 2003,2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.easymock.cglib.proxy;

import org.easymock.cglib.CodeGenTestCase;
import java.beans.*;
import java.lang.reflect.Method;
import java.util.*;
import junit.framework.*;

/**
 * @author Chris Nokleberg
 * @version $Id: TestMixin.java,v 1.6 2012/07/27 16:02:49 baliuka Exp $
 */
public class TestMixin extends CodeGenTestCase {
    public void testSimple() throws Exception {
        Object obj = Mixin.create(new Class[]{ DI1.class, DI2.class },
                                   new Object[]{ new D1(), new D2() });
        assertTrue(((DI1)obj).herby().equals("D1"));
        assertTrue(((DI2)obj).derby().equals("D2"));
    }

    public void testDetermineInterfaces() throws Exception {
        Object obj = Mixin.create(new Object[]{ new D1(), new D2() });
        assertTrue(((DI1)obj).herby().equals("D1"));
        assertTrue(((DI2)obj).derby().equals("D2"));
    }
 
    public void testOverride() throws Exception {
        Object obj = Mixin.create(new Object[]{ new D1(), new D4() });
        assertTrue(((DI1)obj).herby().equals("D1"));
        assertTrue(((DI2)obj).derby().equals("D4"));
    }

    public void testNonOverride() throws Exception {
        Object obj = Mixin.create(new Object[]{ new D4(), new D1() });
        assertTrue(((DI1)obj).herby().equals("D4"));
        assertTrue(((DI2)obj).derby().equals("D4"));
    }

    public void testSubclass() throws Exception {
        Object obj = Mixin.create(new Object[]{ new D3(), new D1() });
        assertTrue(((DI1)obj).herby().equals("D1"));
        assertTrue(((DI2)obj).derby().equals("D2"));
        assertTrue(((DI3)obj).extra().equals("D3"));
    }

    public void testBeans() throws Exception {
        Object obj = Mixin.createBean(new Object[]{ new DBean1(), new DBean2() });
        Set getters = getGetters(obj.getClass());
        assertTrue(getters.size() == 3); // name, age, class
        assertTrue(getters.contains("name"));
        assertTrue(getters.contains("age"));
        assertTrue(!(obj instanceof DI1));
    }

    public void testEverything() throws Exception {
        Mixin.Generator gen = new Mixin.Generator();
        gen.setStyle(Mixin.STYLE_EVERYTHING);
        gen.setDelegates(new Object[]{ new DBean1(), new DBean2() });
        Object obj = gen.create();
        Set getters = getGetters(obj.getClass());
        assertTrue(getters.size() == 3); // name, age, class
        assertTrue(obj instanceof DI1);
        assertTrue(new DBean1().herby().equals(((DI1)obj).herby()));
    }

    public void testNullDelegates() throws Exception {
        Mixin.Generator gen = new Mixin.Generator();
        gen.setStyle(Mixin.STYLE_BEANS);
        gen.setClasses(new Class[]{ DBean1.class, DBean2.class });
        Mixin mixin = gen.create();
        Object obj = mixin.newInstance(new Object[]{ new DBean1(), new DBean2() });
    }

    private static Set getGetters(Class beanClass) throws Exception {
        Set getters = new HashSet();
        PropertyDescriptor[] descriptors =
            Introspector.getBeanInfo(beanClass).getPropertyDescriptors();
        for (int i = 0; i < descriptors.length; i++) {
            if (descriptors[i].getReadMethod() != null) {
                getters.add(descriptors[i].getName());
            }
        }
        return getters;
    }

    private static PropertyDescriptor getProperty(Class beanClass, String property) throws Exception {
        Set getters = new HashSet();
        PropertyDescriptor[] descriptors =
            Introspector.getBeanInfo(beanClass).getPropertyDescriptors();
        for (int i = 0; i < descriptors.length; i++) {
            if (descriptors[i].getName().equals(property))
                return descriptors[i];
        }
        return null;
    }

    public TestMixin(String testName) {
        super(testName);
    }
    
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    
    public static Test suite() {
        return new TestSuite(TestMixin.class);
    }
    
    public void perform(ClassLoader loader) throws Throwable {
        Mixin.createBean(loader, new Object[]{ new DBean1(), new DBean2() });
    }
    
    
    
}