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) {
        junit.textui.TestRunner.run(suite());
    }

    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() {
        assertEquals(null, Thread.getDefaultUncaughtExceptionHandler());
        // failure due to securityException is OK.
        // Would be nice to explicitly test both ways, but cannot yet.
        Thread.UncaughtExceptionHandler defaultHandler
            = Thread.getDefaultUncaughtExceptionHandler();
        Thread current = Thread.currentThread();
        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:	1.16
Committed:	Sun Feb 22 19:15:14 2015 UTC (9 years, 2 months ago) by jsr166
Branch:	MAIN
Changes since 1.15:	+19 -12 lines
Log Message:	improve uncaught exception handler tests
#	Content
1	/*
2	* 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	* http://creativecommons.org/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.Test;
10	import junit.framework.TestSuite;
11
12	public class ThreadTest extends JSR166TestCase {
13	public static void main(String[] args) {
14	junit.textui.TestRunner.run(suite());
15	}
16
17	public static Test suite() {
18	return new TestSuite(ThreadTest.class);
19	}
20
21	static class MyHandler implements Thread.UncaughtExceptionHandler {
22	public void uncaughtException(Thread t, Throwable e) {
23	e.printStackTrace();
24	}
25	}
26
27	/**
28	* getUncaughtExceptionHandler returns ThreadGroup unless set,
29	* otherwise returning value of last setUncaughtExceptionHandler.
30	*/
31	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	assertSame(tg, current.getUncaughtExceptionHandler());
38	current.setUncaughtExceptionHandler(eh);
39	try {
40	assertSame(eh, current.getUncaughtExceptionHandler());
41	} finally {
42	current.setUncaughtExceptionHandler(null);
43	}
44	assertSame(tg, current.getUncaughtExceptionHandler());
45	}
46
47	/**
48	* getDefaultUncaughtExceptionHandler returns value of last
49	* setDefaultUncaughtExceptionHandler.
50	*/
51	public void testGetAndSetDefaultUncaughtExceptionHandler() {
52	assertEquals(null, Thread.getDefaultUncaughtExceptionHandler());
53	// failure due to securityException is OK.
54	// Would be nice to explicitly test both ways, but cannot yet.
55	Thread.UncaughtExceptionHandler defaultHandler
56	= Thread.getDefaultUncaughtExceptionHandler();
57	Thread current = Thread.currentThread();
58	MyHandler eh = new MyHandler();
59	try {
60	Thread.setDefaultUncaughtExceptionHandler(eh);
61	try {
62	assertSame(eh, Thread.getDefaultUncaughtExceptionHandler());
63	} finally {
64	Thread.setDefaultUncaughtExceptionHandler(defaultHandler);
65	}
66	} catch (SecurityException ok) {
67	assertNotNull(System.getSecurityManager());
68	}
69	assertSame(defaultHandler, Thread.getDefaultUncaughtExceptionHandler());
70	}
71
72	// How to test actually using UEH within junit?
73
74	}