Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/12016#discussion_r58281272 --- Diff: core/src/test/scala/org/apache/spark/partial/SumEvaluatorSuite.scala --- @@ -0,0 +1,107 @@ +/* + * 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() + // 38.0 - 7.1E-15 because that's how the maths shakes out + val targetMean = 38.0 - 7.1E-15 + + //Sanity check that equality works on BoundedDouble + assert(new BoundedDouble(2.0, 0.95, 1.1, 1.2) == new BoundedDouble(2.0, 0.95, 1.1, 1.2)) + + // actual test + assert(res == new BoundedDouble(targetMean, 0.950, Double.NegativeInfinity, Double.PositiveInfinity)) + } + + test("correct handling of count 0") { + + //setup + val counter = new StatCounter(List()) + // count of 10 because it's larger than 0, + // 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() + //assert + assert(res == new BoundedDouble(0, 0.0, Double.NegativeInfinity, Double.PositiveInfinity)) + } + + test("correct handling of NaN") { + + //setup + val counter = new StatCounter(List(1,Double.NaN,2)) --- End diff -- Try `./dev/lint-scala`
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