1/*
2 * Copyright (C) 2006 The Guava Authors
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
17package com.google.common.reflect;
18
19import com.google.common.testing.NullPointerTester;
20
21import junit.framework.TestCase;
22
23import java.lang.reflect.InvocationHandler;
24import java.lang.reflect.Method;
25import java.util.Map;
26
27/** Tests for {@link Reflection} */
28public class ReflectionTest extends TestCase {
29
30  public void testGetPackageName() throws Exception {
31    assertEquals("java.lang", Reflection.getPackageName(Iterable.class));
32    assertEquals("java", Reflection.getPackageName("java.MyType"));
33    assertEquals("java.lang", Reflection.getPackageName(Iterable.class.getName()));
34    assertEquals("", Reflection.getPackageName("NoPackage"));
35    assertEquals("java.util", Reflection.getPackageName(Map.Entry.class));
36  }
37
38  public void testNewProxy() throws Exception {
39    Runnable runnable = Reflection.newProxy(Runnable.class, X_RETURNER);
40    assertEquals("x", runnable.toString());
41  }
42
43  public void testNewProxyCantWorkOnAClass() throws Exception {
44    try {
45      Reflection.newProxy(Object.class, X_RETURNER);
46      fail();
47    } catch (IllegalArgumentException expected) {
48    }
49  }
50
51  private static final InvocationHandler X_RETURNER = new InvocationHandler() {
52    @Override
53    public Object invoke(Object proxy, Method method, Object[] args)
54        throws Throwable {
55      return "x";
56    }
57  };
58
59  private static int classesInitialized = 0;
60  private static class A {
61    static {
62      ++classesInitialized;
63    }
64  }
65  private static class B {
66    static {
67      ++classesInitialized;
68    }
69  }
70  private static class C {
71    static {
72      ++classesInitialized;
73    }
74  }
75
76  public void testInitialize() {
77    assertEquals("This test can't be included twice in the same suite.", 0, classesInitialized);
78
79    Reflection.initialize(A.class);
80    assertEquals(1, classesInitialized);
81
82    Reflection.initialize(
83        A.class,  // Already initialized (above)
84        B.class,
85        C.class);
86    assertEquals(3, classesInitialized);
87  }
88
89  public void testNullPointers() {
90    new NullPointerTester().testAllPublicStaticMethods(Reflection.class);
91  }
92}
93