A test for roundtrip timestamp parsing

Author: MaxGekk

sql/catalyst/src/test/scala/org/apache/spark/sql/util/DateTimeFormatterSuite.scala

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+/*
+ * 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.sql.util
+
+import java.util.Locale
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.catalyst.util.{DateFormatter, DateTimeFormatter, DateTimeTestUtils}
+
+class DateTimeFormatterSuite  extends SparkFunSuite {
+
+  test("roundtrip parsing timestamps using timezones") {
+    DateTimeTestUtils.outstandingTimezones.foreach { timeZone =>
+      val timestamp = "2018-12-02T11:22:33.123456"
+      val formatter = DateTimeFormatter("yyyy-MM-dd'T'HH:mm:ss.SSSSSS", timeZone, Locale.US)
+      val micros = formatter.parse(timestamp)
+      val formatted = formatter.format(micros)
+      assert(timestamp === formatted)
+    }
+  }
+}