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      1 /*
      2  * Copyright (C) 2006 Google Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.inject;
     18 
     19 import static java.lang.annotation.RetentionPolicy.RUNTIME;
     20 
     21 import com.google.inject.spi.ElementSource;
     22 import java.lang.annotation.Retention;
     23 import junit.framework.TestCase;
     24 
     25 /** @author crazybob (at) google.com (Bob Lee) */
     26 public class ReflectionTest extends TestCase {
     27 
     28   @Retention(RUNTIME)
     29   @BindingAnnotation
     30   @interface I {}
     31 
     32   public void testNormalBinding() throws CreationException {
     33     final Foo foo = new Foo();
     34 
     35     Injector injector =
     36         Guice.createInjector(
     37             new AbstractModule() {
     38               @Override
     39               protected void configure() {
     40                 bind(Foo.class).toInstance(foo);
     41               }
     42             });
     43 
     44     Binding<Foo> fooBinding = injector.getBinding(Key.get(Foo.class));
     45     assertSame(foo, fooBinding.getProvider().get());
     46     ElementSource source = (ElementSource) fooBinding.getSource();
     47     assertNotNull(source.getDeclaringSource());
     48     assertEquals(Key.get(Foo.class), fooBinding.getKey());
     49   }
     50 
     51   public void testConstantBinding() throws CreationException {
     52     Injector injector =
     53         Guice.createInjector(
     54             new AbstractModule() {
     55               @Override
     56               protected void configure() {
     57                 bindConstant().annotatedWith(I.class).to(5);
     58               }
     59             });
     60 
     61     Binding<?> i = injector.getBinding(Key.get(int.class, I.class));
     62     assertEquals(5, i.getProvider().get());
     63     ElementSource source = (ElementSource) i.getSource();
     64     assertNotNull(source.getDeclaringSource());
     65     assertEquals(Key.get(int.class, I.class), i.getKey());
     66   }
     67 
     68   public void testLinkedBinding() throws CreationException {
     69     final Bar bar = new Bar();
     70 
     71     Injector injector =
     72         Guice.createInjector(
     73             new AbstractModule() {
     74               @Override
     75               protected void configure() {
     76                 bind(Bar.class).toInstance(bar);
     77                 bind(Key.get(Foo.class)).to(Key.get(Bar.class));
     78               }
     79             });
     80 
     81     Binding<Foo> fooBinding = injector.getBinding(Key.get(Foo.class));
     82     assertSame(bar, fooBinding.getProvider().get());
     83     ElementSource source = (ElementSource) fooBinding.getSource();
     84     assertNotNull(source.getDeclaringSource());
     85     assertEquals(Key.get(Foo.class), fooBinding.getKey());
     86   }
     87 
     88   static class Foo {}
     89 
     90   static class Bar extends Foo {}
     91 }
     92