test/tck/ThreadTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.Test;
import junit.framework.TestSuite;

public class ThreadTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }

    public static Test suite() {
        return new TestSuite(ThreadTest.class);
    }

    static class MyHandler implements Thread.UncaughtExceptionHandler {
        public void uncaughtException(Thread t, Throwable e) {
            e.printStackTrace();
        }
    }

    /**
     * getUncaughtExceptionHandler returns ThreadGroup unless set,
     * otherwise returning value of last setUncaughtExceptionHandler.
     */
    public void testGetAndSetUncaughtExceptionHandler() {
        // these must be done all at once to avoid state
        // dependencies across tests
        Thread current = Thread.currentThread();
        ThreadGroup tg = current.getThreadGroup();
        MyHandler eh = new MyHandler();
        assertSame(tg, current.getUncaughtExceptionHandler());
        current.setUncaughtExceptionHandler(eh);
        try {
            assertSame(eh, current.getUncaughtExceptionHandler());
        } finally {
            current.setUncaughtExceptionHandler(null);
        }
        assertSame(tg, current.getUncaughtExceptionHandler());
    }

    /**
     * getDefaultUncaughtExceptionHandler returns value of last
     * setDefaultUncaughtExceptionHandler.
     */
    public void testGetAndSetDefaultUncaughtExceptionHandler() {
        assertNull(Thread.getDefaultUncaughtExceptionHandler());
        // failure due to SecurityException is OK.
        // Would be nice to explicitly test both ways, but cannot yet.
        Thread.UncaughtExceptionHandler defaultHandler
            = Thread.getDefaultUncaughtExceptionHandler();
        MyHandler eh = new MyHandler();
        try {
            Thread.setDefaultUncaughtExceptionHandler(eh);
            try {
                assertSame(eh, Thread.getDefaultUncaughtExceptionHandler());
            } finally {
                Thread.setDefaultUncaughtExceptionHandler(defaultHandler);
            }
        } catch (SecurityException ok) {
            assertNotNull(System.getSecurityManager());
        }
        assertSame(defaultHandler, Thread.getDefaultUncaughtExceptionHandler());
    }

    // How to test actually using UEH within junit?

}
Revision:	1.20
Committed:	Sat Mar 18 20:42:20 2017 UTC (7 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.19:	+1 -1 lines
Log Message:	better assertion style
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.8	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4	jsr166	1.13	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.10	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9	jsr166	1.15	import junit.framework.Test;
10			import junit.framework.TestSuite;
11	dl	1.1
12	dl	1.3	public class ThreadTest extends JSR166TestCase {
13	dl	1.1	public static void main(String[] args) {
14	jsr166	1.18	main(suite(), args);
15	dl	1.1	}
16	jsr166	1.10
17	dl	1.1	public static Test suite() {
18	jsr166	1.12	return new TestSuite(ThreadTest.class);
19	dl	1.1	}
20
21			static class MyHandler implements Thread.UncaughtExceptionHandler {
22			public void uncaughtException(Thread t, Throwable e) {
23			e.printStackTrace();
24			}
25			}
26	jsr166	1.10
27	dl	1.5	/**
28	dl	1.6	* getUncaughtExceptionHandler returns ThreadGroup unless set,
29	dl	1.9	* otherwise returning value of last setUncaughtExceptionHandler.
30	dl	1.5	*/
31	dl	1.1	public void testGetAndSetUncaughtExceptionHandler() {
32			// these must be done all at once to avoid state
33			// dependencies across tests
34			Thread current = Thread.currentThread();
35			ThreadGroup tg = current.getThreadGroup();
36			MyHandler eh = new MyHandler();
37	jsr166	1.16	assertSame(tg, current.getUncaughtExceptionHandler());
38	dl	1.1	current.setUncaughtExceptionHandler(eh);
39	jsr166	1.16	try {
40			assertSame(eh, current.getUncaughtExceptionHandler());
41			} finally {
42			current.setUncaughtExceptionHandler(null);
43			}
44			assertSame(tg, current.getUncaughtExceptionHandler());
45	dl	1.1	}
46	dl	1.4
47	dl	1.5	/**
48	dl	1.6	* getDefaultUncaughtExceptionHandler returns value of last
49	jsr166	1.10	* setDefaultUncaughtExceptionHandler.
50	dl	1.5	*/
51	dl	1.4	public void testGetAndSetDefaultUncaughtExceptionHandler() {
52	jsr166	1.20	assertNull(Thread.getDefaultUncaughtExceptionHandler());
53	jsr166	1.19	// failure due to SecurityException is OK.
54	dl	1.4	// Would be nice to explicitly test both ways, but cannot yet.
55	jsr166	1.16	Thread.UncaughtExceptionHandler defaultHandler
56			= Thread.getDefaultUncaughtExceptionHandler();
57			MyHandler eh = new MyHandler();
58	dl	1.4	try {
59	dl	1.6	Thread.setDefaultUncaughtExceptionHandler(eh);
60	jsr166	1.16	try {
61			assertSame(eh, Thread.getDefaultUncaughtExceptionHandler());
62			} finally {
63			Thread.setDefaultUncaughtExceptionHandler(defaultHandler);
64			}
65			} catch (SecurityException ok) {
66			assertNotNull(System.getSecurityManager());
67	dl	1.6	}
68	jsr166	1.16	assertSame(defaultHandler, Thread.getDefaultUncaughtExceptionHandler());
69	dl	1.6	}
70
71	dl	1.1	// How to test actually using UEH within junit?
72
73			}