}
@Test
public void openCloseOpen() {
MemoryDocumentStore ds = new MemoryDocumentStore();
MemoryBlobStore bs = new MemoryBlobStore();
MongoMK mk1 = createMK(1, 0, ds, bs);
mk1.commit("/", "+\"a\": {}", null, null);
mk1.commit("/", "-\"a\"", null, null);
mk1.runBackgroundOperations();