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* Expert Group and released to the public domain, as explained at |
4 |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
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*/ |
6 |
< |
import junit.framework.*; |
7 |
< |
import java.util.*; |
6 |
> |
|
7 |
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import java.util.SplittableRandom; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.atomic.LongAdder; |
10 |
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|
11 |
+ |
import junit.framework.Test; |
12 |
+ |
import junit.framework.TestSuite; |
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+ |
|
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public class SplittableRandomTest extends JSR166TestCase { |
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|
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public static void main(String[] args) { |
17 |
< |
junit.textui.TestRunner.run(suite()); |
17 |
> |
main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(SplittableRandomTest.class); |
50 |
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Integer.getInteger("SplittableRandomTest.reps", 4); |
51 |
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|
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|
/** |
53 |
+ |
* Repeated calls to next (only accessible via reflection) produce |
54 |
+ |
* at least two distinct results, and repeated calls produce all |
55 |
+ |
* possible values. |
56 |
+ |
*/ |
57 |
+ |
public void testNext() throws ReflectiveOperationException { |
58 |
+ |
SplittableRandom rnd = new SplittableRandom(); |
59 |
+ |
try { |
60 |
+ |
java.lang.reflect.Method m |
61 |
+ |
= SplittableRandom.class.getDeclaredMethod( |
62 |
+ |
"next", new Class[] { int.class }); |
63 |
+ |
m.setAccessible(true); |
64 |
+ |
|
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+ |
int i; |
66 |
+ |
{ |
67 |
+ |
int val = new java.util.Random().nextInt(4); |
68 |
+ |
for (i = 0; i < NCALLS; i++) { |
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+ |
int q = (int) m.invoke(rnd, new Object[] { 2 }); |
70 |
+ |
if (val == q) break; |
71 |
+ |
} |
72 |
+ |
assertTrue(i < NCALLS); |
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+ |
} |
74 |
+ |
|
75 |
+ |
{ |
76 |
+ |
int r = (int) m.invoke(rnd, new Object[] { 3 }); |
77 |
+ |
for (i = 0; i < NCALLS; i++) { |
78 |
+ |
int q = (int) m.invoke(rnd, new Object[] { 3 }); |
79 |
+ |
assertTrue(q < (1<<3)); |
80 |
+ |
if (r != q) break; |
81 |
+ |
} |
82 |
+ |
assertTrue(i < NCALLS); |
83 |
+ |
} |
84 |
+ |
} catch (SecurityException acceptable) {} |
85 |
+ |
} |
86 |
+ |
|
87 |
+ |
/** |
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* Repeated calls to nextInt produce at least two distinct results |
89 |
|
*/ |
90 |
|
public void testNextInt() { |
195 |
|
*/ |
196 |
|
public void testNextIntBounded() { |
197 |
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SplittableRandom sr = new SplittableRandom(); |
198 |
+ |
for (int i = 0; i < 2; i++) assertEquals(0, sr.nextInt(1)); |
199 |
|
// sample bound space across prime number increments |
200 |
|
for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) { |
201 |
|
int f = sr.nextInt(bound); |
265 |
|
*/ |
266 |
|
public void testNextLongBounded() { |
267 |
|
SplittableRandom sr = new SplittableRandom(); |
268 |
+ |
for (int i = 0; i < 2; i++) assertEquals(0L, sr.nextLong(1L)); |
269 |
|
for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) { |
270 |
|
long f = sr.nextLong(bound); |
271 |
|
assertTrue(0 <= f && f < bound); |
447 |
|
for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) { |
448 |
|
for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) { |
449 |
|
final int lo = least, hi = bound; |
450 |
< |
r.ints(size, lo, hi).parallel(). |
451 |
< |
forEach(x -> {if (x < lo || x >= hi) |
452 |
< |
fails.getAndIncrement(); }); |
450 |
> |
r.ints(size, lo, hi).parallel().forEach( |
451 |
> |
x -> { |
452 |
> |
if (x < lo || x >= hi) |
453 |
> |
fails.getAndIncrement(); }); |
454 |
|
} |
455 |
|
} |
456 |
|
assertEquals(0, fails.get()); |
466 |
|
for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) { |
467 |
|
for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) { |
468 |
|
final long lo = least, hi = bound; |
469 |
< |
r.longs(size, lo, hi).parallel(). |
470 |
< |
forEach(x -> {if (x < lo || x >= hi) |
471 |
< |
fails.getAndIncrement(); }); |
469 |
> |
r.longs(size, lo, hi).parallel().forEach( |
470 |
> |
x -> { |
471 |
> |
if (x < lo || x >= hi) |
472 |
> |
fails.getAndIncrement(); }); |
473 |
|
} |
474 |
|
} |
475 |
|
assertEquals(0, fails.get()); |
485 |
|
for (double least = 0.00011; least < 1.0e20; least *= 9) { |
486 |
|
for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) { |
487 |
|
final double lo = least, hi = bound; |
488 |
< |
r.doubles(size, lo, hi).parallel(). |
489 |
< |
forEach(x -> {if (x < lo || x >= hi) |
490 |
< |
fails.getAndIncrement(); }); |
488 |
> |
r.doubles(size, lo, hi).parallel().forEach( |
489 |
> |
x -> { |
490 |
> |
if (x < lo || x >= hi) |
491 |
> |
fails.getAndIncrement(); }); |
492 |
|
} |
493 |
|
} |
494 |
|
assertEquals(0, fails.get()); |