1 //----------------------------------------------------------------------
2 //
3 // PerfectJPattern: "Design patterns are good but components are better!"
4 // TestNullParameter.java Copyright (c) 2009 Giovanni Azua Garcia
5 // bravegag@hotmail.com
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 3
10 // of the License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, see <http://www.gnu.org/licenses/>.
19 //
20 //----------------------------------------------------------------------
21 package org.perfectjpattern.core.behavioral.chainofresponsibility;
22
23 import junit.framework.*;
24
25 import org.perfectjpattern.core.api.behavioral.chainofresponsibility.*;
26
27
28 /**
29 * Test Suite for <code>NullHandler</code> implementation.
30 *
31 * @see NullHandler
32 *
33 * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
34 * @version $Revision: 1.0 $ $Date: Jun 26, 2007 1:01:56 AM $
35 */
36 public
37 class TestNullHandler
38 extends TestCase
39 {
40 //------------------------------------------------------------------------
41 // public
42 //------------------------------------------------------------------------
43 /**
44 * Test that the singleton was properly implemented i.e. there is a
45 * single instance retrieved each time.
46 */
47 public void
48 testSingleton()
49 {
50 assertSame("NullHandler singleton implemented incorrectly.",
51 NullHandler.getInstance(), NullHandler.getInstance());
52 }
53
54 //------------------------------------------------------------------------
55 /**
56 * Test that UnsupportedOperation is thrown when appropriate.
57 */
58 public void
59 testExceptions()
60 {
61 NullHandler myNullHandler = NullHandler.getInstance();
62
63 try
64 {
65 myNullHandler.getSuccessor();
66 fail("getSuccessor() was not implemented correctly.");
67 }
68 catch (UnsupportedOperationException anException)
69 {
70 // ok
71 }
72
73 try
74 {
75 myNullHandler.setChainStrategy(null);
76 fail("setChainStrategy() was not implemented correctly.");
77 }
78 catch (UnsupportedOperationException anException)
79 {
80 // ok
81 }
82
83 try
84 {
85 myNullHandler.setSuccessor(null);
86 fail("setSuccessor() was not implemented correctly.");
87 }
88 catch (UnsupportedOperationException anException)
89 {
90 // ok
91 }
92
93 try
94 {
95 myNullHandler.handle(NullRequest.getInstance());
96 // ok no exception
97 }
98 catch (UnsupportedOperationException anException)
99 {
100 fail("handle() was not implemented correctly.");
101 }
102 }
103
104 //------------------------------------------------------------------------
105 public void
106 testCanHandle()
107 {
108 assertTrue("NullHandler canHandle(...) must always return true",
109 NullHandler.getInstance().canHandle(null));
110 }
111 }