[SPARK-7320] [SQL] [Minor] Move the testData into beforeAll()

Follow up of #6340, to avoid the test report missing once it fails.

Author: Cheng Hao <hao.cheng@intel.com>

Closes #6312 from chenghao-intel/rollup_minor and squashes the following commits:

b03a25f [Cheng Hao] simplify the testData instantiation
09b7e8b [Cheng Hao] move the testData into beforeAll()

sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveDataFrameAnalyticsSuite.scala

@@ -17,25 +17,21 @@
 
 package org.apache.spark.sql.hive
 
-import org.apache.spark.sql.QueryTest
+import org.apache.spark.sql.{DataFrame, QueryTest}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.hive.test.TestHive
 import org.apache.spark.sql.hive.test.TestHive._
 import org.apache.spark.sql.hive.test.TestHive.implicits._
 import org.scalatest.BeforeAndAfterAll
 
-case class TestData2Int(a: Int, b: Int)
-
 // TODO ideally we should put the test suite into the package `sql`, as
 // `hive` package is optional in compiling, however, `SQLContext.sql` doesn't
 // support the `cube` or `rollup` yet.
 class HiveDataFrameAnalyticsSuite extends QueryTest with BeforeAndAfterAll {
-  val testData =
-    TestHive.sparkContext.parallelize(
-      TestData2Int(1, 2) ::
-        TestData2Int(2, 4) :: Nil).toDF()
+  private var testData: DataFrame = _
 
   override def beforeAll() {
+    testData = Seq((1, 2), (2, 4)).toDF("a", "b")
     TestHive.registerDataFrameAsTable(testData, "mytable")
   }