UT style improve

Author: TJX2014

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/DateExpressionsSuite.scala

@@ -1147,13 +1147,14 @@ class DateExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper {
     }
   }
 
-  test("[SPARK-31710][SQL] Adds TIMESTAMP_SECONDS,...") {
+  test("SPARK-31710:Adds TIMESTAMP_SECONDS, " +
+    "TIMESTAMP_MILLIS and TIMESTAMP_MICROS functions") {
     checkEvaluation(SecondsToTimestamp(Literal(1230219000)), 1230219000L * MICROS_PER_SECOND)
     checkEvaluation(SecondsToTimestamp(Literal(-1230219000)), -1230219000L * MICROS_PER_SECOND)
     checkEvaluation(SecondsToTimestamp(Literal(null, IntegerType)), null)
     checkEvaluation(MillisToTimestamp(Literal(1230219000123L)), 1230219000123L * MICROS_PER_MILLIS)
-    checkEvaluation(MillisToTimestamp(Literal(-1230219000123L)),
-      -1230219000123L * MICROS_PER_MILLIS)
+    checkEvaluation(MillisToTimestamp(
+      Literal(-1230219000123L)), -1230219000123L * MICROS_PER_MILLIS)
     checkEvaluation(MillisToTimestamp(Literal(null, IntegerType)), null)
     checkEvaluation(MicrosToTimestamp(Literal(1230219000123123L)), 1230219000123123L)
     checkEvaluation(MicrosToTimestamp(Literal(-1230219000123123L)), -1230219000123123L)