### Question:
BatchUpdateGroup implements UpdateGroup { @Override public void complete() { session.execute(batchStatement); } BatchUpdateGroup(Session session, Executor executor);  BatchUpdateGroup(Session session, BatchStatement batchStatement, Executor executor);  BatchUpdateGroup(Session session, BatchStatement.Type batchType, Executor executor); void addUpdate(Statement statement); @Override void complete(); @Override ListenableFuture<Void> completeAsync(); BatchStatement getBatchStatement();  }### Answer:
@Test public void testComplete() { BatchUpdateGroup group = new BatchUpdateGroup(getSession(), Executors.newSingleThreadExecutor()); group.addUpdate(QueryBuilder.insertInto("foo").value("bar", "baz")); getSession().execute(SchemaBuilder.createTable("foo").addPartitionKey("bar", DataType.varchar())); group.complete(); assertEquals(1, getSession().execute("select bar from foo").all().size()); }