Add LinkedListSerializerTest

flink-table/flink-table-runtime-blink/src/test/java/org/apache/flink/table/runtime/typeutils/LinkedListSerializerTest.java

@@ -0,0 +1,72 @@
+/*
+ * 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.runtime.typeutils;
+
+import org.apache.flink.api.common.typeutils.SerializerTestBase;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+
+import java.util.LinkedList;
+import java.util.Random;
+
+/** A test for the {@link LinkedListSerializer}. */
+public class LinkedListSerializerTest extends SerializerTestBase<LinkedList<Long>> {
+
+    @Override
+    protected TypeSerializer<LinkedList<Long>> createSerializer() {
+        return new LinkedListSerializer<>(LongSerializer.INSTANCE);
+    }
+
+    @Override
+    protected int getLength() {
+        return -1;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    protected Class<LinkedList<Long>> getTypeClass() {
+        return (Class<LinkedList<Long>>) (Class<?>) LinkedList.class;
+    }
+
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    @Override
+    protected LinkedList<Long>[] getTestData() {
+        final Random rnd = new Random(123654789);
+
+        // empty lists
+        final LinkedList<Long> list1 = new LinkedList<>();
+
+        // single element lists
+        final LinkedList<Long> list2 = new LinkedList<>();
+        list2.add(12345L);
+
+        // longer lists
+        final LinkedList<Long> list3 = new LinkedList<>();
+        for (int i = 0; i < rnd.nextInt(200); i++) {
+            list3.add(rnd.nextLong());
+        }
+
+        final LinkedList<Long> list4 = new LinkedList<>();
+        for (int i = 0; i < rnd.nextInt(200); i++) {
+            list4.add(rnd.nextLong());
+        }
+
+        return (LinkedList<Long>[]) new LinkedList[] {list1, list2, list3, list4};
+    }
+}