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/*
 * Copyright 2011 Google Inc.
 * 
 * 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 com.google.gwt.junit;

import com.google.gwt.resources.client.CssResource;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * Helper to make a fake implementation of any {@link CssResource} interface via
 * reflection, for use in JUnit tests. (This will not work in GWTTestCase.) All
 * calls to the returned object (other than ensureInjected) return the method
 * name.
 * 

* Sample use: * *

interface MyCss extends CssResource {
 *   String myStyleName();
 * }
 *
 * public void testSimple() {
 *  MyCss myCss = FakeCssMaker.create(MyCss.class);
 *  assertEquals("myStyleName", messages.myMessage());
 * }
 * 
*/ public class FakeCssMaker implements InvocationHandler { public static T create(Class cssClass) { return cssClass.cast(Proxy.newProxyInstance( FakeCssMaker.class.getClassLoader(), new Class[] {cssClass}, new FakeCssMaker())); } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if (method.getName().equals("ensureInjected") && method.getParameterTypes().length == 0) { return false; } return method.getName(); } }




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