385 |
|
fail("all threads generate the same pseudo-random sequence"); |
386 |
|
} |
387 |
|
|
388 |
+ |
/** |
389 |
+ |
* Repeated calls to nextBytes produce at least values of different signs for every byte |
390 |
+ |
*/ |
391 |
+ |
public void testNextBytes() { |
392 |
+ |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
393 |
+ |
int n = rnd.nextInt(20); |
394 |
+ |
byte[] bytes = new byte[n]; |
395 |
+ |
outer: |
396 |
+ |
for (int i = 0; i < n; i++) { |
397 |
+ |
for (int tries = NCALLS; tries-->0; ) { |
398 |
+ |
byte before = bytes[i]; |
399 |
+ |
rnd.nextBytes(bytes); |
400 |
+ |
byte after = bytes[i]; |
401 |
+ |
if (after * before < 0) |
402 |
+ |
continue outer; |
403 |
+ |
} |
404 |
+ |
fail("not enough variation in random bytes"); |
405 |
+ |
} |
406 |
+ |
} |
407 |
+ |
|
408 |
|
} |