com.google.gwt.junit.FakeCssMaker Maven / Gradle / Ivy
/*
* 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();
}
}