1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.functor.core;
18  
19  import static org.junit.Assert.assertEquals;
20  import static org.junit.Assert.assertFalse;
21  import static org.junit.Assert.assertTrue;
22  import static org.junit.Assert.fail;
23  
24  import org.apache.commons.functor.BaseFunctorTest;
25  import org.apache.commons.functor.BinaryPredicate;
26  import org.apache.commons.functor.UnaryPredicate;
27  import org.junit.Test;
28  
29  /**
30   * @version $Revision: 1171255 $ $Date: 2011-09-15 22:27:39 +0200 (Thu, 15 Sep 2011) $
31   * @author Rodney Waldhoff
32   */
33  public class TestIsInstance extends BaseFunctorTest {
34  
35      // Functor Testing Framework
36      // ------------------------------------------------------------------------
37  
38      protected Object makeFunctor() {
39          return IsInstance.of(String.class);
40      }
41  
42      // Tests
43      // ------------------------------------------------------------------------
44  
45      @Test
46      public void testTest() throws Exception {
47          BinaryPredicate<Object, Class<?>> p = IsInstance.INSTANCE;
48          assertFalse(p.test(null, Number.class));
49          assertFalse(p.test("foo", Number.class));
50          assertTrue(p.test(3, Number.class));
51          assertTrue(p.test(3L, Number.class));
52      }
53  
54      @Test
55      public void testBoundTest() throws Exception {
56          UnaryPredicate<Object> p = IsInstance.of(Number.class);
57          assertFalse(p.test(null));
58          assertFalse(p.test("foo"));
59          assertTrue(p.test(3));
60          assertTrue(p.test(3L));
61      }
62  
63      @Test
64      public void testInstanceOfNull() throws Exception {
65          BinaryPredicate<Object, Class<?>> p = new IsInstance<Object>();
66          try {
67              p.test("foo", null);
68              fail("Expected NullPointerException");
69          } catch(NullPointerException e) {
70              // expected
71          }
72      }
73  
74      @Test
75      public void testEquals() throws Exception {
76          BinaryPredicate<Object, Class<?>> p = IsInstance.INSTANCE;
77          assertEquals(p, p);
78          assertObjectsAreEqual(p, IsInstance.instance());
79          assertObjectsAreNotEqual(p,Constant.truePredicate());
80      }
81  
82      @Test
83      public void testBoundEquals() throws Exception {
84          UnaryPredicate<Object> p = IsInstance.of(Object.class);
85          assertEquals(p,p);
86          assertObjectsAreEqual(p,IsInstance.of(Object.class));
87          assertObjectsAreNotEqual(p,Constant.truePredicate());
88          assertObjectsAreNotEqual(p,IsInstance.of(null));
89          assertObjectsAreNotEqual(p,IsInstance.of(String.class));
90      }
91  }