@Test
public void checkMemoryDrop() {

  OrientDB orientDB = new OrientDB("embedded:", OrientDBConfig.defaultConfig());
  OrientGraphFactory factory =
      new OrientGraphFactory(orientDB, "_dropDB", ODatabaseType.MEMORY, "admin", "admin");
  factory.getNoTx();
  Assert.assertEquals(true, orientDB.exists("_dropDB"));
  factory.drop();
}