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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import java.util.Arrays; |
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import java.util.List; |
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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; |
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import java.lang.reflect.Method; |
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import java.util.function.Predicate; |
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import java.util.stream.Collectors; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class SplittableRandomTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(SplittableRandomTest.class); |
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*/ |
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public void testNextIntBounded() { |
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SplittableRandom sr = new SplittableRandom(); |
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for (int i = 0; i < 2; i++) assertEquals(0, sr.nextInt(1)); |
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// sample bound space across prime number increments |
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for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) { |
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int f = sr.nextInt(bound); |
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*/ |
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public void testNextLongBounded() { |
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SplittableRandom sr = new SplittableRandom(); |
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for (int i = 0; i < 2; i++) assertEquals(0L, sr.nextLong(1L)); |
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for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) { |
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long f = sr.nextLong(bound); |
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assertTrue(0 <= f && f < bound); |
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for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) { |
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for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) { |
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final int lo = least, hi = bound; |
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< |
r.ints(size, lo, hi).parallel(). |
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< |
forEach(x -> {if (x < lo || x >= hi) |
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< |
fails.getAndIncrement(); }); |
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> |
r.ints(size, lo, hi).parallel().forEach( |
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> |
x -> { |
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> |
if (x < lo || x >= hi) |
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> |
fails.getAndIncrement(); }); |
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} |
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} |
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assertEquals(0, fails.get()); |
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for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) { |
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for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) { |
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final long lo = least, hi = bound; |
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< |
r.longs(size, lo, hi).parallel(). |
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< |
forEach(x -> {if (x < lo || x >= hi) |
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< |
fails.getAndIncrement(); }); |
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> |
r.longs(size, lo, hi).parallel().forEach( |
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x -> { |
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> |
if (x < lo || x >= hi) |
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fails.getAndIncrement(); }); |
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} |
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} |
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assertEquals(0, fails.get()); |
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for (double least = 0.00011; least < 1.0e20; least *= 9) { |
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for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) { |
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final double lo = least, hi = bound; |
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< |
r.doubles(size, lo, hi).parallel(). |
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< |
forEach(x -> {if (x < lo || x >= hi) |
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< |
fails.getAndIncrement(); }); |
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> |
r.doubles(size, lo, hi).parallel().forEach( |
| 459 |
> |
x -> { |
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> |
if (x < lo || x >= hi) |
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> |
fails.getAndIncrement(); }); |
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} |
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} |
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assertEquals(0, fails.get()); |
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assertEquals(size, counter.sum()); |
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} |
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|
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/** |
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* SplittableRandom should implement most of Random's public methods |
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*/ |
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public void testShouldImplementMostRandomMethods() throws Throwable { |
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Predicate<Method> wasForgotten = method -> { |
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String name = method.getName(); |
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// some methods deliberately not implemented |
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if (name.equals("setSeed")) return false; |
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if (name.equals("nextFloat")) return false; |
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if (name.equals("nextGaussian")) return false; |
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try { |
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SplittableRandom.class.getMethod( |
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method.getName(), method.getParameterTypes()); |
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} catch (ReflectiveOperationException ex) { |
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return true; |
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} |
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return false; |
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}; |
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List<Method> forgotten = |
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Arrays.stream(java.util.Random.class.getMethods()) |
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.filter(wasForgotten) |
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.collect(Collectors.toList()); |
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if (!forgotten.isEmpty()) |
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throw new AssertionError("Please implement: " + forgotten); |
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} |
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|
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/** |
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* Repeated calls to nextBytes produce at least values of different signs for every byte |
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*/ |
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public void testNextBytes() { |
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SplittableRandom sr = new SplittableRandom(); |
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int n = sr.nextInt(1, 20); |
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byte[] bytes = new byte[n]; |
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outer: |
| 567 |
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for (int i = 0; i < n; i++) { |
| 568 |
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for (int tries = NCALLS; tries-->0; ) { |
| 569 |
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byte before = bytes[i]; |
| 570 |
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sr.nextBytes(bytes); |
| 571 |
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byte after = bytes[i]; |
| 572 |
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if (after * before < 0) |
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continue outer; |
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+ |
} |
| 575 |
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fail("not enough variation in random bytes"); |
| 576 |
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} |
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} |
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|
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/** |
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* Filling an empty array with random bytes succeeds without effect. |
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+ |
*/ |
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+ |
public void testNextBytes_emptyArray() { |
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new SplittableRandom().nextBytes(new byte[0]); |
| 584 |
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} |
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|
| 586 |
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public void testNextBytes_nullArray() { |
| 587 |
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try { |
| 588 |
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new SplittableRandom().nextBytes(null); |
| 589 |
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shouldThrow(); |
| 590 |
+ |
} catch (NullPointerException success) {} |
| 591 |
+ |
} |
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+ |
|
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} |
