public void testToString() throws Exception {
   IntAllocator ibs = new IntAllocator(LO_RANGE, HI_RANGE);
   assertEquals("IntAllocator{allocated = []}", ibs.toString());
   ibs.allocate();
   assertEquals("IntAllocator{allocated = [100]}", ibs.toString());
   for (int i = 200; i < 211; i = i + 4) {
     ibs.reserve(i);
     ibs.reserve(i + 1);
     ibs.reserve(i + 2);
   }
   assertEquals("IntAllocator{allocated = [100, 200..202, 204..206, 208..210]}", ibs.toString());
 }
  public void testAllocateAndFree() throws Exception {
    Set<Integer> set = new HashSet<Integer>();
    for (int i = 0; i < TEST_ITERATIONS; ++i) {
      if (getBool(rand)) {
        int trial = iAll.allocate();
        assertFalse("Already allocated " + trial, set.contains(trial));
        set.add(trial);
      } else {
        if (!set.isEmpty()) {
          int trial = extractOne(set);
          assertFalse("Allocator agreed to reserve " + trial, iAll.reserve(trial));
          iAll.free(trial);
        }
      }
    }

    for (int trial : set) {
      assertFalse("Integer " + trial + " should be allocated!", iAll.reserve(trial));
    }
  }