Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18567#discussion_r126274671
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/SparkSessionBuilderSuite.scala ---
    @@ -17,13 +17,15 @@
     
     package org.apache.spark.sql
     
    +import org.scalatest.BeforeAndAfterEach
    +
     import org.apache.spark.{SparkConf, SparkContext, SparkFunSuite}
     import org.apache.spark.sql.internal.SQLConf
     
     /**
      * Test cases for the builder pattern of [[SparkSession]].
      */
    -class SparkSessionBuilderSuite extends SparkFunSuite {
    +class SparkSessionBuilderSuite extends SparkFunSuite with 
BeforeAndAfterEach {
     
       private var initialSession: SparkSession = _
    --- End diff --
    
    Seems this is only used in the first test case? shall we just move it to 
the first test case?


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