static void shuffle(Object[] keys) {
    int size = keys.length;
    for (int i = size; i > 1; i--) {
      int r = rng.nextInt(i);
      Object t = keys[i - 1];
      keys[i - 1] = keys[r];
      keys[r] = t;
    }
  }
@test
@synopsis Times and checks basic map operations
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/cm/MapCheckJUnitTest.java