1 /*
2 * Copyright 2008-2012 smartics, Kronseder & Reiner GmbH
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 package de.smartics.util.test.theories;
17
18 import static org.hamcrest.CoreMatchers.equalTo;
19 import static org.hamcrest.CoreMatchers.is;
20 import static org.hamcrest.CoreMatchers.not;
21 import static org.junit.Assert.assertThat;
22 import static org.junit.Assume.assumeThat;
23
24 import java.io.IOException;
25
26 import org.junit.experimental.theories.Theories;
27 import org.junit.experimental.theories.Theory;
28 import org.junit.runner.RunWith;
29
30 import de.smartics.util.test.io.SerialTestUtils;
31
32 /* CHECKSTYLE:OFF */
33 /**
34 * Test theory on serializing serializable instances. If instances are defined
35 * as data points that are not serializable, the test leads to a test error.
36 *
37 * @author <a href="mailto:robert.reiner@smartics.de">Robert Reiner</a>
38 * @version $Revision:591 $
39 */
40 @RunWith(Theories.class)
41 public abstract class SerializationTheory // NOPMD
42 /* CHECKSTYLE:ON */
43 {
44 // ********************************* Fields *********************************
45
46 // --- constants ------------------------------------------------------------
47
48 // --- members --------------------------------------------------------------
49
50 // ****************************** Inner Classes *****************************
51
52 // ********************************* Methods ********************************
53
54 // --- prepare --------------------------------------------------------------
55
56 // --- helper ---------------------------------------------------------------
57
58 // CHECKSTYLE:OFF
59 /**
60 * Determines whether or not the theory should check the serialized and
61 * deserialized instance on equality with the original instance. If the unit
62 * under test (UUT) does not provide an implementation of
63 * {@link Object#equals(Object)}, this method must return <code>false</code>.
64 * <p>
65 * Override this method by your subclass.
66 * </p>
67 *
68 * @return <code>false</code> per default.
69 */
70 protected boolean checkThatResultEquals()
71 {
72 return false;
73 }
74
75 // CHECKSTYLE:ON
76
77 // --- tests ----------------------------------------------------------------
78
79 /**
80 * Checks that the unit under test (UUT) is serializable.
81 *
82 * @param uut the unit under test. It is required for the instance to
83 * implement the equals method, if {@link #checkThatResultEquals()}
84 * returns <code>true</code> If that method returns
85 * <code>false</code> this test only checks that the serialization
86 * process throws no exception.
87 * @throws ClassNotFoundException if the class cannot be found during
88 * deserialization.
89 * @throws IOException on any problem writing the instance to or reading it
90 * from the stream.
91 * @see java.io.Serializable
92 * @see java.io.Externizable
93 */
94 @Theory
95 public final void isSerializable(final Object uut) throws IOException,
96 ClassNotFoundException
97 {
98 assumeThat(uut, is(not(equalTo(null))));
99
100 final Object serializedAndDerserializedInstance =
101 SerialTestUtils.runSerialization(uut);
102 if (checkThatResultEquals())
103 {
104 assertThat(uut.equals(serializedAndDerserializedInstance), is(true));
105 }
106 }
107 }