/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds licenses this file
 * to you 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.jclouds.config;

import static org.testng.Assert.assertEquals;

import org.testng.annotations.Test;

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.name.Names;

/**
 * Tests behavior of ValueOfConfigurationKeyOrNull
 * 
 * @author Adrian Cole
 */
@Test(groups = "unit")
public class ValueOfConfigurationKeyOrNullTest {

   @Test
   public void testNotThere() {
      assertEquals(Guice.createInjector().getInstance(ValueOfConfigurationKeyOrNull.class).apply("foo"), null);
   }

   @Test
   public void testThere() {
      assertEquals(Guice.createInjector(new AbstractModule() {

         @Override
         protected void configure() {
            bindConstant().annotatedWith(Names.named("foo")).to("bar");
         }

      }).getInstance(ValueOfConfigurationKeyOrNull.class).apply("foo"), "bar");
   }
   
   @Test
   public void testEmptyIsThere() {
      assertEquals(Guice.createInjector(new AbstractModule() {

         @Override
         protected void configure() {
            bindConstant().annotatedWith(Names.named("foo")).to("");
         }

      }).getInstance(ValueOfConfigurationKeyOrNull.class).apply("foo"), "");
   }
}