com.google.gwt.junit.FakeMessagesMaker Maven / Gradle / Ivy
/*
* Copyright 2009 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.i18n.client.Messages;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
/**
* Helper to make a fake implementation of any {@link Messages} interface via
* reflection, for use in JUnit tests. (This will not work in GWTTestCase.) All
* calls to the returned object return the method name followed by the passed
* parameters as a list surrounded by [].
*
* Note that the default message text is very consciously not made available
* through the fake, to help tests ensure that specific translations of
* localized text are not relied upon.
*
* Sample use:
*
*
interface MyMessages extends Messages {
* @DefaultMessage("Isn''t this the fakiest?")
* @Description("A sample message to be tested.")
* String myMessage();
* }
*
* public void testSimple() {
* MyMessages messages = FakeMessagesMaker.create(MyMessages.class);
* assertEquals("myMessage", messages.myMessage());
* }
*
*/
public class FakeMessagesMaker implements InvocationHandler {
public static T create(Class messagesClass) {
return messagesClass.cast(Proxy.newProxyInstance(
FakeMessagesMaker.class.getClassLoader(), new Class[] {messagesClass},
new FakeMessagesMaker()));
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
String name = method.getName();
String result = (args == null || args.length == 0) ? name : name
+ Arrays.asList(args);
if (SafeHtml.class.isAssignableFrom(method.getReturnType())) {
return SafeHtmlUtils.fromString(result);
}
return result;
}
}