test/tck/FutureTaskTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, Mike Judd.
 */

import junit.framework.*;
import java.util.concurrent.*;
import java.util.*;

public class FutureTaskTest extends JSR166TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run (suite());  
    }
    public static Test suite() {
        return new TestSuite(FutureTaskTest.class);
    }

    /**
     * Subclass to expose protected methods
     */
    static class PublicFutureTask extends FutureTask {
        public PublicFutureTask(Callable r) { super(r); }
        public boolean reset() { return super.reset(); }
        public void setCancelled() { super.setCancelled(); }
        public void set(Object x) { super.set(x); }
        public void setException(Throwable t) { super.setException(t); }
    }

    /**
     * Creating a future with a null callable throws NPE
     */
    public void testConstructor() {
        try {
            FutureTask task = new FutureTask(null);
            shouldThrow();
        }
        catch(NullPointerException success) {
        }
    }

    /**
     * creating a future with null runnable fails
     */
    public void testConstructor2() {
        try {
            FutureTask task = new FutureTask(null, Boolean.TRUE);
            shouldThrow();
        }
        catch(NullPointerException success) {
        }
    }

    /**
     * isDone is true when a task completes
     */
    public void testIsDone() {
        FutureTask task = new FutureTask( new NoOpCallable());
        task.run();
        assertTrue(task.isDone());
        assertFalse(task.isCancelled());
    }

    /**
     * reset of a done task succeeds and changes status to not done
     */
    public void testReset() {
        PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
        task.run();
        assertTrue(task.isDone());
        assertTrue(task.reset());       
        assertFalse(task.isDone());
    }

    /**
     * Resetting after cancellation fails
     */
    public void testResetAfterCancel() {
        PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
        assertTrue(task.cancel(false));
        task.run();
        assertTrue(task.isDone());
        assertTrue(task.isCancelled());
        assertFalse(task.reset());
    }


    /**
     * setCancelled of a new task causes isCancelled to be true
     */
    public void testSetCancelled() {
        PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
        assertTrue(task.cancel(false));
        task.setCancelled();
        assertTrue(task.isDone());
        assertTrue(task.isCancelled());
    }

    /**
     * setting value gauses get to return it
     */
    public void testSet() {
        PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
        task.set(one);
        try {
            assertEquals(task.get(), one);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * setException causes get to throw ExecutionException
     */
    public void testSetException() {
        Exception nse = new NoSuchElementException();
        PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
        task.setException(nse);
        try {
            Object x = task.get();
            shouldThrow();
        }
        catch(ExecutionException ee) {
            Throwable cause = ee.getCause();
            assertEquals(cause, nse);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     *  Cancelling before running succeeds
     */
    public void testCancelBeforeRun() {
        FutureTask task = new FutureTask( new NoOpCallable());
        assertTrue(task.cancel(false));
        task.run();
        assertTrue(task.isDone());
        assertTrue(task.isCancelled());
    }

    /**
     * Cancel(true) before run succeeds
     */
    public void testCancelBeforeRun2() {
        FutureTask task = new FutureTask( new NoOpCallable());
        assertTrue(task.cancel(true));
        task.run();
        assertTrue(task.isDone());
        assertTrue(task.isCancelled());
    }

    /**
     * cancel of a completed task fails
     */
    public void testCancelAfterRun() {
        FutureTask task = new FutureTask( new NoOpCallable());
        task.run();
        assertFalse(task.cancel(false));
        assertTrue(task.isDone());
        assertFalse(task.isCancelled());
    }

    /**
     * cancel(true) interrupts a running task
     */
    public void testCancelInterrupt() {
        FutureTask task = new FutureTask( new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(MEDIUM_DELAY_MS);
                        threadShouldThrow();
                    }
                    catch (InterruptedException success) {}
                    return Boolean.TRUE;
                } });
        Thread t = new  Thread(task);
        t.start();
        
        try {
            Thread.sleep(SHORT_DELAY_MS);
            assertTrue(task.cancel(true));
            t.join();
            assertTrue(task.isDone());
            assertTrue(task.isCancelled());
        } catch(InterruptedException e){
            unexpectedException();
        }
    }


    /**
     * cancel(false) does not interrupt a running task
     */
    public void testCancelNoInterrupt() {
        FutureTask task = new FutureTask( new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(MEDIUM_DELAY_MS);
                    }
                    catch (InterruptedException success) {
                        threadFail("should not interrupt");
                    }
                    return Boolean.TRUE;
                } });
        Thread t = new  Thread(task);
        t.start();
        
        try {
            Thread.sleep(SHORT_DELAY_MS);
            assertTrue(task.cancel(false));
            t.join();
            assertTrue(task.isDone());
            assertTrue(task.isCancelled());
        } catch(InterruptedException e){
            unexpectedException();
        }
    }

    /**
     * set in one thread causes get in another thread to retrieve value
     */
    public void testGet1() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(MEDIUM_DELAY_MS);
                    } catch(InterruptedException e){
                        threadUnexpectedException();
                    }
                    return Boolean.TRUE;
                }
        });
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        ft.get();
                    } catch(Exception e){
                        threadUnexpectedException();
                    }
                }
            });
        try {
            assertFalse(ft.isDone());
            assertFalse(ft.isCancelled());
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            ft.run();
            t.join();
            assertTrue(ft.isDone());
            assertFalse(ft.isCancelled());
        } catch(InterruptedException e){
            unexpectedException();

        }       
    }

    /**
     * set in one thread causes timed get in another thread to retrieve value
     */
    public void testTimedGet1() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(MEDIUM_DELAY_MS);
                    } catch(InterruptedException e){
                        threadUnexpectedException();
                    }
                    return Boolean.TRUE;
                }
            });
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
                    } catch(TimeoutException success) {
                    } catch(Exception e){
                        threadUnexpectedException();
                    }
                }
            });
        try {
            assertFalse(ft.isDone());
            assertFalse(ft.isCancelled());
            t.start();
            ft.run();
            t.join();
            assertTrue(ft.isDone());
            assertFalse(ft.isCancelled());
        } catch(InterruptedException e){
            unexpectedException();
            
        }       
    }

    /**
     *  Cancelling a task causes timed get in another thread to throw CancellationException
     */
    public void testTimedGet_Cancellation() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(SMALL_DELAY_MS);
                        threadShouldThrow();
                    } catch(InterruptedException e) {
                    }
                    return Boolean.TRUE;
                }
            });
        try {
            Thread t1 = new Thread(new Runnable() {
                    public void run() {
                        try {
                            ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
                            threadShouldThrow();
                        } catch(CancellationException success) {}
                        catch(Exception e){
                            threadUnexpectedException();
                        }
                    }
                });
            Thread t2 = new Thread(ft);
            t1.start(); 
            t2.start();
            Thread.sleep(SHORT_DELAY_MS);
            ft.cancel(true);
            t1.join();
            t2.join();
        } catch(InterruptedException ie){
            unexpectedException();
        }
    }

    /**
     * Cancelling a task causes get in another thread to throw CancellationException
     */
    public void testGet_Cancellation() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    try {
                        Thread.sleep(MEDIUM_DELAY_MS);
                        threadShouldThrow();
                    } catch(InterruptedException e){
                    }
                    return Boolean.TRUE;
                }
            });
        try {
            Thread t1 = new Thread(new Runnable() {
                    public void run() {
                        try {
                            ft.get();
                            threadShouldThrow();
                        } catch(CancellationException success){
                        }
                        catch(Exception e){
                            threadUnexpectedException();
                        }
                    }
                });
            Thread t2 = new Thread(ft);
            t1.start(); 
            t2.start();
            Thread.sleep(SHORT_DELAY_MS);
            ft.cancel(true);
            t1.join();
            t2.join();
        } catch(InterruptedException success){
            unexpectedException();
        }
    }
    

    /**
     * A runtime exception in task causes get to throw ExecutionException
     */
    public void testGet_ExecutionException() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    int i = 5/0;
                    return Boolean.TRUE;
                }
            });
        try {
            ft.run();
            ft.get();
            shouldThrow();
        } catch(ExecutionException success){
        }
        catch(Exception e){
            unexpectedException();
        }
    }
  
    /**
     *  A runtime exception in task causes timed get to throw ExecutionException
     */
    public void testTimedGet_ExecutionException2() {
        final FutureTask ft = new FutureTask(new Callable() {
                public Object call() {
                    int i = 5/0;
                    return Boolean.TRUE;
                }
            });
        try {
            ft.run();
            ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
            shouldThrow();
        } catch(ExecutionException success) { 
        } catch(TimeoutException success) { } // unlikely but OK
        catch(Exception e){
            unexpectedException();
        }
    }
      

    /**
     * Interrupting a waiting get causes it to throw InterruptedException
     */
    public void testGet_InterruptedException() {
        final FutureTask ft = new FutureTask(new NoOpCallable());
        Thread t = new Thread(new Runnable() {
                public void run() {                 
                    try {
                        ft.get();
                        threadShouldThrow();
                    } catch(InterruptedException success){
                    } catch(Exception e){
                        threadUnexpectedException();
                    }
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch(Exception e){
            unexpectedException();
        }
    }

    /**
     *  Interrupting a waiting timed get causes it to throw InterruptedException
     */
    public void testTimedGet_InterruptedException2() {
        final FutureTask ft = new FutureTask(new NoOpCallable());
        Thread t = new Thread(new Runnable() {
                public void run() {                 
                    try {
                        ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
                        threadShouldThrow();
                    } catch(InterruptedException success){}
                    catch(Exception e){
                        threadUnexpectedException();
                    }
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch(Exception e){
            unexpectedException();
        }
    }
    
    /**
     * A timed out timed get throws TimeoutException
     */
    public void testGet_TimeoutException() {
        try {
            FutureTask ft = new FutureTask(new NoOpCallable());
            ft.get(1,TimeUnit.MILLISECONDS);
            shouldThrow();
        } catch(TimeoutException success){}
        catch(Exception success){
            unexpectedException();
        }
    }
    
}
Revision:	1.8
Committed:	Mon Dec 22 00:48:55 2003 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.7:	+0 -10 lines
Log Message:	Add and adjust tests reflecting API changes
#	Content
1	/*
2	* Written by members of JCP JSR-166 Expert Group and released to the
3	* public domain. Use, modify, and redistribute this code in any way
4	* without acknowledgement. Other contributors include Andrew Wright,
5	* Jeffrey Hayes, Pat Fischer, Mike Judd.
6	*/
7
8	import junit.framework.*;
9	import java.util.concurrent.*;
10	import java.util.*;
11
12	public class FutureTaskTest extends JSR166TestCase {
13
14	public static void main(String[] args) {
15	junit.textui.TestRunner.run (suite());
16	}
17	public static Test suite() {
18	return new TestSuite(FutureTaskTest.class);
19	}
20
21	/**
22	* Subclass to expose protected methods
23	*/
24	static class PublicFutureTask extends FutureTask {
25	public PublicFutureTask(Callable r) { super(r); }
26	public boolean reset() { return super.reset(); }
27	public void setCancelled() { super.setCancelled(); }
28	public void set(Object x) { super.set(x); }
29	public void setException(Throwable t) { super.setException(t); }
30	}
31
32	/**
33	* Creating a future with a null callable throws NPE
34	*/
35	public void testConstructor() {
36	try {
37	FutureTask task = new FutureTask(null);
38	shouldThrow();
39	}
40	catch(NullPointerException success) {
41	}
42	}
43
44	/**
45	* creating a future with null runnable fails
46	*/
47	public void testConstructor2() {
48	try {
49	FutureTask task = new FutureTask(null, Boolean.TRUE);
50	shouldThrow();
51	}
52	catch(NullPointerException success) {
53	}
54	}
55
56	/**
57	* isDone is true when a task completes
58	*/
59	public void testIsDone() {
60	FutureTask task = new FutureTask( new NoOpCallable());
61	task.run();
62	assertTrue(task.isDone());
63	assertFalse(task.isCancelled());
64	}
65
66	/**
67	* reset of a done task succeeds and changes status to not done
68	*/
69	public void testReset() {
70	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
71	task.run();
72	assertTrue(task.isDone());
73	assertTrue(task.reset());
74	assertFalse(task.isDone());
75	}
76
77	/**
78	* Resetting after cancellation fails
79	*/
80	public void testResetAfterCancel() {
81	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
82	assertTrue(task.cancel(false));
83	task.run();
84	assertTrue(task.isDone());
85	assertTrue(task.isCancelled());
86	assertFalse(task.reset());
87	}
88
89
90	/**
91	* setCancelled of a new task causes isCancelled to be true
92	*/
93	public void testSetCancelled() {
94	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
95	assertTrue(task.cancel(false));
96	task.setCancelled();
97	assertTrue(task.isDone());
98	assertTrue(task.isCancelled());
99	}
100
101	/**
102	* setting value gauses get to return it
103	*/
104	public void testSet() {
105	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
106	task.set(one);
107	try {
108	assertEquals(task.get(), one);
109	}
110	catch(Exception e) {
111	unexpectedException();
112	}
113	}
114
115	/**
116	* setException causes get to throw ExecutionException
117	*/
118	public void testSetException() {
119	Exception nse = new NoSuchElementException();
120	PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
121	task.setException(nse);
122	try {
123	Object x = task.get();
124	shouldThrow();
125	}
126	catch(ExecutionException ee) {
127	Throwable cause = ee.getCause();
128	assertEquals(cause, nse);
129	}
130	catch(Exception e) {
131	unexpectedException();
132	}
133	}
134
135	/**
136	* Cancelling before running succeeds
137	*/
138	public void testCancelBeforeRun() {
139	FutureTask task = new FutureTask( new NoOpCallable());
140	assertTrue(task.cancel(false));
141	task.run();
142	assertTrue(task.isDone());
143	assertTrue(task.isCancelled());
144	}
145
146	/**
147	* Cancel(true) before run succeeds
148	*/
149	public void testCancelBeforeRun2() {
150	FutureTask task = new FutureTask( new NoOpCallable());
151	assertTrue(task.cancel(true));
152	task.run();
153	assertTrue(task.isDone());
154	assertTrue(task.isCancelled());
155	}
156
157	/**
158	* cancel of a completed task fails
159	*/
160	public void testCancelAfterRun() {
161	FutureTask task = new FutureTask( new NoOpCallable());
162	task.run();
163	assertFalse(task.cancel(false));
164	assertTrue(task.isDone());
165	assertFalse(task.isCancelled());
166	}
167
168	/**
169	* cancel(true) interrupts a running task
170	*/
171	public void testCancelInterrupt() {
172	FutureTask task = new FutureTask( new Callable() {
173	public Object call() {
174	try {
175	Thread.sleep(MEDIUM_DELAY_MS);
176	threadShouldThrow();
177	}
178	catch (InterruptedException success) {}
179	return Boolean.TRUE;
180	} });
181	Thread t = new Thread(task);
182	t.start();
183
184	try {
185	Thread.sleep(SHORT_DELAY_MS);
186	assertTrue(task.cancel(true));
187	t.join();
188	assertTrue(task.isDone());
189	assertTrue(task.isCancelled());
190	} catch(InterruptedException e){
191	unexpectedException();
192	}
193	}
194
195
196	/**
197	* cancel(false) does not interrupt a running task
198	*/
199	public void testCancelNoInterrupt() {
200	FutureTask task = new FutureTask( new Callable() {
201	public Object call() {
202	try {
203	Thread.sleep(MEDIUM_DELAY_MS);
204	}
205	catch (InterruptedException success) {
206	threadFail("should not interrupt");
207	}
208	return Boolean.TRUE;
209	} });
210	Thread t = new Thread(task);
211	t.start();
212
213	try {
214	Thread.sleep(SHORT_DELAY_MS);
215	assertTrue(task.cancel(false));
216	t.join();
217	assertTrue(task.isDone());
218	assertTrue(task.isCancelled());
219	} catch(InterruptedException e){
220	unexpectedException();
221	}
222	}
223
224	/**
225	* set in one thread causes get in another thread to retrieve value
226	*/
227	public void testGet1() {
228	final FutureTask ft = new FutureTask(new Callable() {
229	public Object call() {
230	try {
231	Thread.sleep(MEDIUM_DELAY_MS);
232	} catch(InterruptedException e){
233	threadUnexpectedException();
234	}
235	return Boolean.TRUE;
236	}
237	});
238	Thread t = new Thread(new Runnable() {
239	public void run() {
240	try {
241	ft.get();
242	} catch(Exception e){
243	threadUnexpectedException();
244	}
245	}
246	});
247	try {
248	assertFalse(ft.isDone());
249	assertFalse(ft.isCancelled());
250	t.start();
251	Thread.sleep(SHORT_DELAY_MS);
252	ft.run();
253	t.join();
254	assertTrue(ft.isDone());
255	assertFalse(ft.isCancelled());
256	} catch(InterruptedException e){
257	unexpectedException();
258
259	}
260	}
261
262	/**
263	* set in one thread causes timed get in another thread to retrieve value
264	*/
265	public void testTimedGet1() {
266	final FutureTask ft = new FutureTask(new Callable() {
267	public Object call() {
268	try {
269	Thread.sleep(MEDIUM_DELAY_MS);
270	} catch(InterruptedException e){
271	threadUnexpectedException();
272	}
273	return Boolean.TRUE;
274	}
275	});
276	Thread t = new Thread(new Runnable() {
277	public void run() {
278	try {
279	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
280	} catch(TimeoutException success) {
281	} catch(Exception e){
282	threadUnexpectedException();
283	}
284	}
285	});
286	try {
287	assertFalse(ft.isDone());
288	assertFalse(ft.isCancelled());
289	t.start();
290	ft.run();
291	t.join();
292	assertTrue(ft.isDone());
293	assertFalse(ft.isCancelled());
294	} catch(InterruptedException e){
295	unexpectedException();
296
297	}
298	}
299
300	/**
301	* Cancelling a task causes timed get in another thread to throw CancellationException
302	*/
303	public void testTimedGet_Cancellation() {
304	final FutureTask ft = new FutureTask(new Callable() {
305	public Object call() {
306	try {
307	Thread.sleep(SMALL_DELAY_MS);
308	threadShouldThrow();
309	} catch(InterruptedException e) {
310	}
311	return Boolean.TRUE;
312	}
313	});
314	try {
315	Thread t1 = new Thread(new Runnable() {
316	public void run() {
317	try {
318	ft.get(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
319	threadShouldThrow();
320	} catch(CancellationException success) {}
321	catch(Exception e){
322	threadUnexpectedException();
323	}
324	}
325	});
326	Thread t2 = new Thread(ft);
327	t1.start();
328	t2.start();
329	Thread.sleep(SHORT_DELAY_MS);
330	ft.cancel(true);
331	t1.join();
332	t2.join();
333	} catch(InterruptedException ie){
334	unexpectedException();
335	}
336	}
337
338	/**
339	* Cancelling a task causes get in another thread to throw CancellationException
340	*/
341	public void testGet_Cancellation() {
342	final FutureTask ft = new FutureTask(new Callable() {
343	public Object call() {
344	try {
345	Thread.sleep(MEDIUM_DELAY_MS);
346	threadShouldThrow();
347	} catch(InterruptedException e){
348	}
349	return Boolean.TRUE;
350	}
351	});
352	try {
353	Thread t1 = new Thread(new Runnable() {
354	public void run() {
355	try {
356	ft.get();
357	threadShouldThrow();
358	} catch(CancellationException success){
359	}
360	catch(Exception e){
361	threadUnexpectedException();
362	}
363	}
364	});
365	Thread t2 = new Thread(ft);
366	t1.start();
367	t2.start();
368	Thread.sleep(SHORT_DELAY_MS);
369	ft.cancel(true);
370	t1.join();
371	t2.join();
372	} catch(InterruptedException success){
373	unexpectedException();
374	}
375	}
376
377
378	/**
379	* A runtime exception in task causes get to throw ExecutionException
380	*/
381	public void testGet_ExecutionException() {
382	final FutureTask ft = new FutureTask(new Callable() {
383	public Object call() {
384	int i = 5/0;
385	return Boolean.TRUE;
386	}
387	});
388	try {
389	ft.run();
390	ft.get();
391	shouldThrow();
392	} catch(ExecutionException success){
393	}
394	catch(Exception e){
395	unexpectedException();
396	}
397	}
398
399	/**
400	* A runtime exception in task causes timed get to throw ExecutionException
401	*/
402	public void testTimedGet_ExecutionException2() {
403	final FutureTask ft = new FutureTask(new Callable() {
404	public Object call() {
405	int i = 5/0;
406	return Boolean.TRUE;
407	}
408	});
409	try {
410	ft.run();
411	ft.get(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
412	shouldThrow();
413	} catch(ExecutionException success) {
414	} catch(TimeoutException success) { } // unlikely but OK
415	catch(Exception e){
416	unexpectedException();
417	}
418	}
419
420
421	/**
422	* Interrupting a waiting get causes it to throw InterruptedException
423	*/
424	public void testGet_InterruptedException() {
425	final FutureTask ft = new FutureTask(new NoOpCallable());
426	Thread t = new Thread(new Runnable() {
427	public void run() {
428	try {
429	ft.get();
430	threadShouldThrow();
431	} catch(InterruptedException success){
432	} catch(Exception e){
433	threadUnexpectedException();
434	}
435	}
436	});
437	try {
438	t.start();
439	Thread.sleep(SHORT_DELAY_MS);
440	t.interrupt();
441	t.join();
442	} catch(Exception e){
443	unexpectedException();
444	}
445	}
446
447	/**
448	* Interrupting a waiting timed get causes it to throw InterruptedException
449	*/
450	public void testTimedGet_InterruptedException2() {
451	final FutureTask ft = new FutureTask(new NoOpCallable());
452	Thread t = new Thread(new Runnable() {
453	public void run() {
454	try {
455	ft.get(LONG_DELAY_MS,TimeUnit.MILLISECONDS);
456	threadShouldThrow();
457	} catch(InterruptedException success){}
458	catch(Exception e){
459	threadUnexpectedException();
460	}
461	}
462	});
463	try {
464	t.start();
465	Thread.sleep(SHORT_DELAY_MS);
466	t.interrupt();
467	t.join();
468	} catch(Exception e){
469	unexpectedException();
470	}
471	}
472
473	/**
474	* A timed out timed get throws TimeoutException
475	*/
476	public void testGet_TimeoutException() {
477	try {
478	FutureTask ft = new FutureTask(new NoOpCallable());
479	ft.get(1,TimeUnit.MILLISECONDS);
480	shouldThrow();
481	} catch(TimeoutException success){}
482	catch(Exception success){
483	unexpectedException();
484	}
485	}
486
487	}