Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19950#discussion_r157343164
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/ml/tree/impl/TreePointSuite.scala ---
    @@ -0,0 +1,39 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *    http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.spark.ml.tree.impl
    +
    +import org.apache.spark.{SparkConf, SparkFunSuite}
    +import org.apache.spark.serializer.KryoSerializer
    +
    +class TreePointSuite extends SparkFunSuite{
    +  test("Kryo class register") {
    +    val conf = new SparkConf(false)
    +    conf.set("spark.kryo.registrationRequired", "true")
    +
    +    val ser = new KryoSerializer(conf).newInstance()
    +
    +    def check(p: TreePoint): Unit = {
    --- End diff --
    
    Is there much value in defining this method?


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