Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4829#discussion_r145653182
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/batch/table/stringexpr/StringExpressionTest.scala
---
@@ -0,0 +1,51 @@
+/*
+ * 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.flink.table.api.batch.table.stringexpr
+
+import org.apache.flink.table.expressions.{ExpressionParser, Literal,
UnresolvedFieldReference}
+import org.junit.{Assert, Test}
+
+class StringExpressionTest {
--- End diff --
I've converted the test into an expression test (extending
`ExpressionTestBase`) and moved it to `org.apache.flink.table.expressions`.
---
