call := plugin.NewDriverCall(expandVolumeCmd)
	call.AppendSpec(spec, plugin.host, nil)

	devicePath, err := plugin.getDeviceMountPath(spec)
	if err != nil {
		return newSize, err
	}
	call.Append(devicePath)
	call.Append(strconv.FormatInt(newSize.Value(), 10))
	call.Append(strconv.FormatInt(oldSize.Value(), 10))

	_, err = call.Run()

    assertEquals(map.size(), oldSize - 1);
    assertFalse(map.containsKey(key));
    assertEquals(subMap.size(), oldSize - 2);
  }

  public void testTailMapClearThrough() {
    SortedMap<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }
    int oldSize = map.size();
    if (map.size() < 2 || !supportsClear) {

    assertEquals(map.size(), oldSize - 1);
    assertFalse(map.containsKey(key));
    assertEquals(subMap.size(), oldSize - 2);
  }

  public void testTailMapClearThrough() {
    SortedMap<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }
    int oldSize = map.size();
    if (map.size() < 2 || !supportsClear) {

		}
		if _, loaded := record.LoadOrStore(size, nil); loaded {
			t.Errorf("detected duplicated cache size metric for %d", size)
		}
		newSize := uint64(size)
		oldSize := cacheSize.Swap(newSize)
		if oldSize > newSize {
			t.Errorf("cache size decreased from %d to %d", oldSize, newSize)
		}
	}
	transformer := &envelopeTransformer{}

	want := sets.NewInt()
	startCh := make(chan struct{})
	wg := sync.WaitGroup{}

      if (collection.isEmpty()) {
        return false;
      }
      int oldSize = size(); // calls refreshIfEmpty
      boolean changed = delegate.addAll(collection);
      if (changed) {
        int newSize = delegate.size();
        totalSize += (newSize - oldSize);
        if (oldSize == 0) {
          addToMap();
        }
      }
      return changed;
    }

    @Override

	return &expanderDefaults{plugin}
}

func (e *expanderDefaults) ExpandVolumeDevice(spec *volume.Spec, newSize resource.Quantity, oldSize resource.Quantity) (resource.Quantity, error) {
	klog.Warning(logPrefix(e.plugin), "using default expand for volume ", spec.Name(), ", to size ", newSize, " from ", oldSize)
	return newSize, nil
}

	if !ok {
		return nil
	}
	oldPvc, ok := a.GetOldObject().(*api.PersistentVolumeClaim)
	if !ok {
		return nil
	}

	oldSize := oldPvc.Spec.Resources.Requests[api.ResourceStorage]
	newSize := pvc.Spec.Resources.Requests[api.ResourceStorage]

	if newSize.Cmp(oldSize) <= 0 {
		return nil
	}

	if oldPvc.Status.Phase != api.ClaimBound {

      if (collection.isEmpty()) {
        return false;
      }
      int oldSize = size(); // calls refreshIfEmpty
      boolean changed = delegate.addAll(collection);
      if (changed) {
        int newSize = delegate.size();
        totalSize += (newSize - oldSize);
        if (oldSize == 0) {
          addToMap();
        }
      }
      return changed;
    }

    @Override

  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require({SUPPORTS_REMOVE, SUPPORTS_PUT})
  public void testPropagatesRemoveThenAddToMultimap() {
    int oldSize = getNumElements();

    Collection<V> result = multimap().asMap().get(k0());
    assertTrue(result.remove(v0()));

    assertFalse(multimap().containsKey(k0()));

  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require({SUPPORTS_REMOVE, SUPPORTS_PUT})
  public void testPropagatesRemoveLastThenAddToMultimap() {
    int oldSize = getNumElements();

    Collection<V> result = multimap().get(k0());
    assertTrue(result.remove(v0()));

    assertFalse(multimap().containsKey(k0()));
    assertFalse(multimap().containsEntry(k0(), v0()));