test/tck/AtomicLongFieldUpdaterTest.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 java.util.concurrent.atomic.AtomicLongFieldUpdater;

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

public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
    volatile long x = 0;
    protected volatile long protectedField;
    private volatile long privateField;
    long w;
    float z;
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(AtomicLongFieldUpdaterTest.class);
    }

    // for testing subclass access
    static class AtomicLongFieldUpdaterTestSubclass extends AtomicLongFieldUpdaterTest {
        public void checkPrivateAccess() {
            try {
                AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                    AtomicLongFieldUpdater.newUpdater
                    (AtomicLongFieldUpdaterTest.class, "privateField");
                shouldThrow();
            } catch (RuntimeException success) {
                assertNotNull(success.getCause());
            }
        }

        public void checkCompareAndSetProtectedSub() {
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "protectedField");
            this.protectedField = 1;
            assertTrue(a.compareAndSet(this, 1, 2));
            assertTrue(a.compareAndSet(this, 2, -4));
            assertEquals(-4, a.get(this));
            assertFalse(a.compareAndSet(this, -5, 7));
            assertEquals(-4, a.get(this));
            assertTrue(a.compareAndSet(this, -4, 7));
            assertEquals(7, a.get(this));
        }
    }

    static class UnrelatedClass {
        public void checkPackageAccess(AtomicLongFieldUpdaterTest obj) {
            obj.x = 72L;
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "x");
            assertEquals(72L, a.get(obj));
            assertTrue(a.compareAndSet(obj, 72L, 73L));
            assertEquals(73L, a.get(obj));
        }

        public void checkPrivateAccess(AtomicLongFieldUpdaterTest obj) {
            try {
                AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                    AtomicLongFieldUpdater.newUpdater
                    (AtomicLongFieldUpdaterTest.class, "privateField");
                throw new AssertionError("should throw");
            } catch (RuntimeException success) {
                assertNotNull(success.getCause());
            }
        }
    }

    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
        return AtomicLongFieldUpdater.newUpdater
            (AtomicLongFieldUpdaterTest.class, fieldName);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            updaterFor("y");
            shouldThrow();
        } catch (RuntimeException success) {
            assertNotNull(success.getCause());
        }
    }

    /**
     * construction with field not of given type throws IllegalArgumentException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * construction with non-volatile field throws IllegalArgumentException
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * construction using private field from subclass throws RuntimeException
     */
    public void testPrivateFieldInSubclass() {
        AtomicLongFieldUpdaterTestSubclass s =
            new AtomicLongFieldUpdaterTestSubclass();
        s.checkPrivateAccess();
    }

    /**
     * construction from unrelated class; package access is allowed,
     * private access is not
     */
    public void testUnrelatedClassAccess() {
        new UnrelatedClass().checkPackageAccess(this);
        new UnrelatedClass().checkPrivateAccess(this);
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.get(this));
        a.set(this, 2);
        assertEquals(2, a.get(this));
        a.set(this, -3);
        assertEquals(-3, a.get(this));
    }

    /**
     * get returns the last value lazySet by same thread
     */
    public void testGetLazySet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.get(this));
        a.lazySet(this, 2);
        assertEquals(2, a.get(this));
        a.lazySet(this, -3);
        assertEquals(-3, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertTrue(a.compareAndSet(this, 1, 2));
        assertTrue(a.compareAndSet(this, 2, -4));
        assertEquals(-4, a.get(this));
        assertFalse(a.compareAndSet(this, -5, 7));
        assertEquals(-4, a.get(this));
        assertTrue(a.compareAndSet(this, -4, 7));
        assertEquals(7, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing protected field value if
     * equal to expected else fails
     */
    public void testCompareAndSetProtected() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("protectedField");
        protectedField = 1;
        assertTrue(a.compareAndSet(this, 1, 2));
        assertTrue(a.compareAndSet(this, 2, -4));
        assertEquals(-4, a.get(this));
        assertFalse(a.compareAndSet(this, -5, 7));
        assertEquals(-4, a.get(this));
        assertTrue(a.compareAndSet(this, -4, 7));
        assertEquals(7, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing protected field value if
     * equal to expected else fails
     */
    public void testCompareAndSetProtectedInSubclass() {
        AtomicLongFieldUpdaterTestSubclass s =
            new AtomicLongFieldUpdaterTestSubclass();
        s.checkCompareAndSetProtectedSub();
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        x = 1;
        final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(this, 1, 2));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertEquals(3, a.get(this));
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        do {} while (!a.weakCompareAndSet(this, 1, 2));
        do {} while (!a.weakCompareAndSet(this, 2, -4));
        assertEquals(-4, a.get(this));
        do {} while (!a.weakCompareAndSet(this, -4, 7));
        assertEquals(7, a.get(this));
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.getAndSet(this, 0));
        assertEquals(0, a.getAndSet(this, -10));
        assertEquals(-10, a.getAndSet(this, 1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.getAndAdd(this, 2));
        assertEquals(3, a.get(this));
        assertEquals(3, a.getAndAdd(this, -4));
        assertEquals(-1, a.get(this));
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.getAndDecrement(this));
        assertEquals(0, a.getAndDecrement(this));
        assertEquals(-1, a.getAndDecrement(this));
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.getAndIncrement(this));
        assertEquals(2, a.get(this));
        a.set(this, -2);
        assertEquals(-2, a.getAndIncrement(this));
        assertEquals(-1, a.getAndIncrement(this));
        assertEquals(0, a.getAndIncrement(this));
        assertEquals(1, a.get(this));
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(3, a.addAndGet(this, 2));
        assertEquals(3, a.get(this));
        assertEquals(-1, a.addAndGet(this, -4));
        assertEquals(-1, a.get(this));
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(0, a.decrementAndGet(this));
        assertEquals(-1, a.decrementAndGet(this));
        assertEquals(-2, a.decrementAndGet(this));
        assertEquals(-2, a.get(this));
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(2, a.incrementAndGet(this));
        assertEquals(2, a.get(this));
        a.set(this, -2);
        assertEquals(-1, a.incrementAndGet(this));
        assertEquals(0, a.incrementAndGet(this));
        assertEquals(1, a.incrementAndGet(this));
        assertEquals(1, a.get(this));
    }

}
Revision:	1.32
Committed:	Mon Nov 9 18:42:41 2015 UTC (8 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.31:	+4 -3 lines
Log Message:	improve tests for caller class != declaring class
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* 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	1.19	* 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	1.21	import java.util.concurrent.atomic.AtomicLongFieldUpdater;
10	dl	1.1
11	jsr166	1.27	import junit.framework.Test;
12			import junit.framework.TestSuite;
13
14	dl	1.2	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
15	dl	1.1	volatile long x = 0;
16	dl	1.30	protected volatile long protectedField;
17			private volatile long privateField;
18	dl	1.4	long w;
19	dl	1.30	float z;
20	jsr166	1.12	public static void main(String[] args) {
21	jsr166	1.29	main(suite(), args);
22	dl	1.1	}
23			public static Test suite() {
24			return new TestSuite(AtomicLongFieldUpdaterTest.class);
25			}
26
27	dl	1.30	// for testing subclass access
28			static class AtomicLongFieldUpdaterTestSubclass extends AtomicLongFieldUpdaterTest {
29			public void checkPrivateAccess() {
30			try {
31			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
32			AtomicLongFieldUpdater.newUpdater
33			(AtomicLongFieldUpdaterTest.class, "privateField");
34			shouldThrow();
35			} catch (RuntimeException success) {
36			assertNotNull(success.getCause());
37			}
38			}
39
40			public void checkCompareAndSetProtectedSub() {
41	jsr166	1.32	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
42			AtomicLongFieldUpdater.newUpdater
43			(AtomicLongFieldUpdaterTest.class, "protectedField");
44			this.protectedField = 1;
45	dl	1.30	assertTrue(a.compareAndSet(this, 1, 2));
46			assertTrue(a.compareAndSet(this, 2, -4));
47			assertEquals(-4, a.get(this));
48			assertFalse(a.compareAndSet(this, -5, 7));
49			assertEquals(-4, a.get(this));
50			assertTrue(a.compareAndSet(this, -4, 7));
51			assertEquals(7, a.get(this));
52			}
53			}
54
55			static class UnrelatedClass {
56	jsr166	1.31	public void checkPackageAccess(AtomicLongFieldUpdaterTest obj) {
57			obj.x = 72L;
58			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
59			AtomicLongFieldUpdater.newUpdater
60			(AtomicLongFieldUpdaterTest.class, "x");
61			assertEquals(72L, a.get(obj));
62			assertTrue(a.compareAndSet(obj, 72L, 73L));
63			assertEquals(73L, a.get(obj));
64			}
65
66			public void checkPrivateAccess(AtomicLongFieldUpdaterTest obj) {
67	dl	1.30	try {
68			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
69			AtomicLongFieldUpdater.newUpdater
70	jsr166	1.31	(AtomicLongFieldUpdaterTest.class, "privateField");
71			throw new AssertionError("should throw");
72			} catch (RuntimeException success) {
73			assertNotNull(success.getCause());
74	dl	1.30	}
75			}
76			}
77
78	jsr166	1.24	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
79			return AtomicLongFieldUpdater.newUpdater
80			(AtomicLongFieldUpdaterTest.class, fieldName);
81			}
82
83	dl	1.3	/**
84	dl	1.7	* Construction with non-existent field throws RuntimeException
85	dl	1.3	*/
86	jsr166	1.12	public void testConstructor() {
87	jsr166	1.11	try {
88	jsr166	1.24	updaterFor("y");
89	dl	1.3	shouldThrow();
90	jsr166	1.25	} catch (RuntimeException success) {
91	jsr166	1.26	assertNotNull(success.getCause());
92	jsr166	1.25	}
93	dl	1.1	}
94
95	dl	1.3	/**
96	jsr166	1.25	* construction with field not of given type throws IllegalArgumentException
97	dl	1.3	*/
98	jsr166	1.12	public void testConstructor2() {
99	jsr166	1.11	try {
100	jsr166	1.24	updaterFor("z");
101	dl	1.3	shouldThrow();
102	jsr166	1.25	} catch (IllegalArgumentException success) {}
103	dl	1.1	}
104
105	dl	1.3	/**
106	jsr166	1.25	* construction with non-volatile field throws IllegalArgumentException
107	dl	1.3	*/
108	jsr166	1.12	public void testConstructor3() {
109	jsr166	1.11	try {
110	jsr166	1.24	updaterFor("w");
111	dl	1.3	shouldThrow();
112	jsr166	1.25	} catch (IllegalArgumentException success) {}
113	dl	1.1	}
114
115	dl	1.3	/**
116	dl	1.30	* construction using private field from subclass throws RuntimeException
117			*/
118			public void testPrivateFieldInSubclass() {
119			AtomicLongFieldUpdaterTestSubclass s =
120			new AtomicLongFieldUpdaterTestSubclass();
121			s.checkPrivateAccess();
122			}
123
124			/**
125	jsr166	1.31	* construction from unrelated class; package access is allowed,
126			* private access is not
127	dl	1.30	*/
128			public void testUnrelatedClassAccess() {
129	jsr166	1.31	new UnrelatedClass().checkPackageAccess(this);
130			new UnrelatedClass().checkPrivateAccess(this);
131	dl	1.30	}
132
133			/**
134	jsr166	1.18	* get returns the last value set or assigned
135	dl	1.3	*/
136	jsr166	1.12	public void testGetSet() {
137	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
138	jsr166	1.24	a = updaterFor("x");
139	dl	1.1	x = 1;
140	jsr166	1.22	assertEquals(1, a.get(this));
141			a.set(this, 2);
142			assertEquals(2, a.get(this));
143			a.set(this, -3);
144			assertEquals(-3, a.get(this));
145	dl	1.1	}
146	dl	1.9
147			/**
148	jsr166	1.18	* get returns the last value lazySet by same thread
149	dl	1.9	*/
150	jsr166	1.12	public void testGetLazySet() {
151	dl	1.9	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
152	jsr166	1.24	a = updaterFor("x");
153	dl	1.9	x = 1;
154	jsr166	1.22	assertEquals(1, a.get(this));
155			a.lazySet(this, 2);
156			assertEquals(2, a.get(this));
157			a.lazySet(this, -3);
158			assertEquals(-3, a.get(this));
159	dl	1.9	}
160
161	dl	1.3	/**
162	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
163	dl	1.3	*/
164	jsr166	1.12	public void testCompareAndSet() {
165	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
166	jsr166	1.24	a = updaterFor("x");
167	dl	1.1	x = 1;
168	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
169			assertTrue(a.compareAndSet(this, 2, -4));
170			assertEquals(-4, a.get(this));
171			assertFalse(a.compareAndSet(this, -5, 7));
172			assertEquals(-4, a.get(this));
173			assertTrue(a.compareAndSet(this, -4, 7));
174			assertEquals(7, a.get(this));
175	dl	1.1	}
176
177	dl	1.4	/**
178	dl	1.30	* compareAndSet succeeds in changing protected field value if
179			* equal to expected else fails
180			*/
181			public void testCompareAndSetProtected() {
182			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
183			a = updaterFor("protectedField");
184			protectedField = 1;
185			assertTrue(a.compareAndSet(this, 1, 2));
186			assertTrue(a.compareAndSet(this, 2, -4));
187			assertEquals(-4, a.get(this));
188			assertFalse(a.compareAndSet(this, -5, 7));
189			assertEquals(-4, a.get(this));
190			assertTrue(a.compareAndSet(this, -4, 7));
191			assertEquals(7, a.get(this));
192			}
193
194			/**
195			* compareAndSet succeeds in changing protected field value if
196			* equal to expected else fails
197			*/
198			public void testCompareAndSetProtectedInSubclass() {
199			AtomicLongFieldUpdaterTestSubclass s =
200			new AtomicLongFieldUpdaterTestSubclass();
201			s.checkCompareAndSetProtectedSub();
202			}
203
204			/**
205	dl	1.4	* compareAndSet in one thread enables another waiting for value
206			* to succeed
207			*/
208	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
209	dl	1.4	x = 1;
210	jsr166	1.24	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
211			a = updaterFor("x");
212	dl	1.4
213	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
214			public void realRun() {
215			while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
216			Thread.yield();
217			}});
218	jsr166	1.13
219			t.start();
220			assertTrue(a.compareAndSet(this, 1, 2));
221			t.join(LONG_DELAY_MS);
222			assertFalse(t.isAlive());
223	jsr166	1.23	assertEquals(3, a.get(this));
224	dl	1.4	}
225
226	dl	1.3	/**
227	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
228	jsr166	1.10	* to expected
229	dl	1.3	*/
230	jsr166	1.12	public void testWeakCompareAndSet() {
231	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
232	jsr166	1.24	a = updaterFor("x");
233	dl	1.1	x = 1;
234	jsr166	1.28	do {} while (!a.weakCompareAndSet(this, 1, 2));
235			do {} while (!a.weakCompareAndSet(this, 2, -4));
236	jsr166	1.22	assertEquals(-4, a.get(this));
237	jsr166	1.28	do {} while (!a.weakCompareAndSet(this, -4, 7));
238	jsr166	1.22	assertEquals(7, a.get(this));
239	dl	1.1	}
240
241	dl	1.3	/**
242	jsr166	1.18	* getAndSet returns previous value and sets to given value
243	dl	1.3	*/
244	jsr166	1.12	public void testGetAndSet() {
245	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
246	jsr166	1.24	a = updaterFor("x");
247	dl	1.1	x = 1;
248	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
249			assertEquals(0, a.getAndSet(this, -10));
250			assertEquals(-10, a.getAndSet(this, 1));
251	dl	1.1	}
252
253	dl	1.3	/**
254	dl	1.4	* getAndAdd returns previous value and adds given value
255	dl	1.3	*/
256	jsr166	1.12	public void testGetAndAdd() {
257	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
258	jsr166	1.24	a = updaterFor("x");
259	dl	1.1	x = 1;
260	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
261			assertEquals(3, a.get(this));
262			assertEquals(3, a.getAndAdd(this, -4));
263			assertEquals(-1, a.get(this));
264	dl	1.1	}
265
266	dl	1.3	/**
267	dl	1.4	* getAndDecrement returns previous value and decrements
268	dl	1.3	*/
269	jsr166	1.12	public void testGetAndDecrement() {
270	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
271	jsr166	1.24	a = updaterFor("x");
272	dl	1.1	x = 1;
273	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
274			assertEquals(0, a.getAndDecrement(this));
275			assertEquals(-1, a.getAndDecrement(this));
276	dl	1.1	}
277
278	dl	1.3	/**
279	dl	1.4	* getAndIncrement returns previous value and increments
280	dl	1.3	*/
281	jsr166	1.12	public void testGetAndIncrement() {
282	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
283	jsr166	1.24	a = updaterFor("x");
284	dl	1.1	x = 1;
285	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
286			assertEquals(2, a.get(this));
287			a.set(this, -2);
288			assertEquals(-2, a.getAndIncrement(this));
289			assertEquals(-1, a.getAndIncrement(this));
290			assertEquals(0, a.getAndIncrement(this));
291			assertEquals(1, a.get(this));
292	dl	1.1	}
293
294	dl	1.3	/**
295	dl	1.4	* addAndGet adds given value to current, and returns current value
296	dl	1.3	*/
297	jsr166	1.12	public void testAddAndGet() {
298	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
299	jsr166	1.24	a = updaterFor("x");
300	dl	1.1	x = 1;
301	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
302			assertEquals(3, a.get(this));
303			assertEquals(-1, a.addAndGet(this, -4));
304			assertEquals(-1, a.get(this));
305	dl	1.1	}
306
307	dl	1.3	/**
308	jsr166	1.18	* decrementAndGet decrements and returns current value
309	dl	1.3	*/
310	jsr166	1.12	public void testDecrementAndGet() {
311	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
312	jsr166	1.24	a = updaterFor("x");
313	dl	1.1	x = 1;
314	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
315			assertEquals(-1, a.decrementAndGet(this));
316			assertEquals(-2, a.decrementAndGet(this));
317			assertEquals(-2, a.get(this));
318	dl	1.1	}
319
320	dl	1.3	/**
321	dl	1.4	* incrementAndGet increments and returns current value
322	dl	1.3	*/
323	jsr166	1.12	public void testIncrementAndGet() {
324	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
325	jsr166	1.24	a = updaterFor("x");
326	dl	1.1	x = 1;
327	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
328			assertEquals(2, a.get(this));
329			a.set(this, -2);
330			assertEquals(-1, a.incrementAndGet(this));
331			assertEquals(0, a.incrementAndGet(this));
332			assertEquals(1, a.incrementAndGet(this));
333			assertEquals(1, a.get(this));
334	dl	1.1	}
335
336			}