1 package org.djunits;
2
3 import static org.junit.Assert.fail;
4
5 /**
6 * Use the Try class as follows:
7 *
8 * <pre>
9 * new Try(
10 * public @Override void execute()
11 * {
12 * // code to test that should fail
13 * }).test();
14 * </pre>
15 * <p>
16 * Copyright (c) 2019-2020 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
17 * BSD-style license. See <a href="https://djunits.org/docs/license.html">DJUNITS License</a>.
18 * <p>
19 * @author <a href="https://www.tudelft.nl/averbraeck" target="_blank">Alexander Verbraeck</a>
20 */
21 public abstract class Try
22 {
23 /** implement the execute method to test failure. */
24 public abstract void execute();
25
26 /** call the test method to test failure of the try. */
27 public void test()
28 {
29 test("method should have thrown an exception");
30 }
31
32 /**
33 * call the test method to test failure of the try.
34 * @param message the message to print
35 */
36 public void test(final String message)
37 {
38 try
39 {
40 execute();
41 fail(message);
42 }
43 catch (Exception e)
44 {
45 // ok!
46 }
47 }
48
49 /**
50 * call the test method to test failure of the try with an expected exception type.
51 * @param message the message to print
52 * @param expectedExceptionClass the expected exception
53 */
54 public void test(final String message, final Class<? extends Exception> expectedExceptionClass)
55 {
56 try
57 {
58 execute();
59 fail(message);
60 }
61 catch (Exception e)
62 {
63 if (!expectedExceptionClass.isInstance(e))
64 {
65 fail(message + ", unexcepted exception: " + e.getClass().getSimpleName());
66 }
67 }
68 }
69 }