if ( retries != 1 ) {
                    // backoff, but don't delay the first attempt as there are various reasons that can be fixed
                    // immediately
                    Thread.sleep(500 + RAND.nextInt(1000));
                }
            }
            catch ( InterruptedException e ) {
                log.debug("interrupted sleep in send", e);
            }

            if ( request != null ) {

    for (int i = 0; i < iterations; i++) {
      List<Integer> list = Lists.newArrayList();
      for (int j = 0; j < elements; j++) {
        list.add(random.nextInt(10 * i + j + 1));
      }

      for (int seed = 1; seed < seeds; seed++) {
        int k = random.nextInt(10 * seed);
        assertEquals(ordering.sortedCopy(list).subList(0, k), ordering.leastOf(list, k));
      }
    }
  }

    for (int i = 0; i < iterations; i++) {
      List<Integer> list = Lists.newArrayList();
      for (int j = 0; j < elements; j++) {
        list.add(random.nextInt(10 * i + j + 1));
      }

      for (int seed = 1; seed < seeds; seed++) {
        int k = random.nextInt(10 * seed);
        assertEquals(ordering.sortedCopy(list).subList(0, k), ordering.leastOf(list, k));
      }
    }
  }

    assertNotNull(ArbitraryInstances.get(Ticker.class));
    assertFreshInstanceReturned(Random.class);
    assertEquals(
        ArbitraryInstances.get(Random.class).nextInt(),
        ArbitraryInstances.get(Random.class).nextInt());
  }

  public void testGet_concurrent() {
    assertTrue(ArbitraryInstances.get(BlockingDeque.class).isEmpty());
    assertTrue(ArbitraryInstances.get(BlockingQueue.class).isEmpty());

    CacheLoader<String, String> countingIdentityLoader =
        new CacheLoader<String, String>() {
          @Override
          public String load(String key) throws InterruptedException {
            int behavior = random.nextInt(4);
            if (behavior == 0) { // throw an exception
              exceptionCount.incrementAndGet();
              throw new RuntimeException("fake exception for test");

      assertFalse(len4.matches(c));
    }

    Random rand = new Random(1234);
    for (int testCase = 0; testCase < 100; testCase++) {
      char[] chars = randomChars(rand, rand.nextInt(63) + 1);
      CharMatcher m = SmallCharMatcher.from(bitSet(chars), new String(chars));
      checkExactMatches(m, chars);
    }
  }

  static void checkExactMatches(CharMatcher m, char[] chars) {

    final int max;

    private ListSizeDistribution(int min, int max) {
      this.min = min;
      this.max = max;
    }

    public int chooseSize(Random random) {
      return random.nextInt(max - min + 1) + min;
    }
  }

    final int max;

    private ListSizeDistribution(int min, int max) {
      this.min = min;
      this.max = max;
    }

    public int chooseSize(Random random) {
      return random.nextInt(max - min + 1) + min;
    }
  }

                    logger.debug("Created new class realm {}", realmId);

                    return classRealm;
                } catch (DuplicateRealmException e) {
                    realmId = id + '-' + random.nextInt();
                }
            }
        }
    }

    public ClassRealm getMavenApiRealm() {
        return mavenApiRealm;
    }

    @Override
    public ClassRealm getMaven4ApiRealm() {

    static final void randBytes ( Random r, byte[] buffer ) {
        // regular nextBytes is not reproducible if the reads are not aligned
        for ( int i = 0; i < buffer.length; i++ ) {
            buffer[ i ] = (byte) r.nextInt(256);
        }

    }