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

    https://github.com/apache/spark/pull/12016#discussion_r57724115
  
    --- Diff: 
core/src/test/scala/org/apache/spark/partial/SumEvaluatorSuite.scala ---
    @@ -0,0 +1,49 @@
    +/*
    + * 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.partial
    +
    +
    +import org.apache.spark._
    +import org.apache.spark.util.StatCounter
    +
    +class SumEvaluatorSuite extends SparkFunSuite with SharedSparkContext {
    +
    +  test("correct handling of count 1") {
    +
    +    //setup
    +    val counter = new StatCounter(List(2.0))
    +    // count of 10 because it's larger than 1,
    +    // and 0.95 because that's the default
    +    val evaluator = new SumEvaluator(10, 0.95)
    +    // arbitrarily assign id 1
    +    evaluator.merge(1, counter)
    +
    +    //execute
    +    val res = evaluator.currentResult()
    +    // Build version with known precisions for equality check
    +    val round_res = new BoundedDouble(res.mean.round.toDouble, 
res.confidence, res.low, res.high)
    --- End diff --
    
    I don't see a reason to round to the nearest integer. You can assert 
approximate equality in a test. But I think you can assert exact equality in 
this case since it's deterministic


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