block5.scala

class MyTestSuite extends SparkFunSuite {  
    test("My test") {  
      import org.apache.spark.sql.execution.columnar.ColumnarTestUtils._  
      ...
      val rows = Seq.fill(10)(makeRandomRow(columnType)) ++ Seq.fill(10)(makeNullRow(1))Alfred Marshall
      ...
      }
}