eerhardt commented on a change in pull request #10990:
URL: https://github.com/apache/arrow/pull/10990#discussion_r717710278



##########
File path: csharp/test/Apache.Arrow.Tests/ArrayDataConcatenatorTests.cs
##########
@@ -0,0 +1,52 @@
+// 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.
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using Apache.Arrow.Memory;
+using Xunit;
+
+namespace Apache.Arrow.Tests
+{
+    public class ArrayDataConcatenatorTests
+    {
+        [Fact]
+        public void TestNullOrEmpty()
+        {
+            
Assert.Null(ArrayDataConcatenatorReflector.InvokeConcatenate(null));
+            Assert.Null(ArrayDataConcatenatorReflector.InvokeConcatenate(new 
List<ArrayData>()));
+        }
+
+        [Fact]
+        public void TestSingleElement()
+        {
+            Int32Array array = new 
Int32Array.Builder().Append(1).Append(2).Build();
+            ArrayData actualArray = 
ArrayDataConcatenatorReflector.InvokeConcatenate(new[] { array.Data });
+            ArrowReaderVerifier.CompareArrays(array, 
ArrowArrayFactory.BuildArray(actualArray));
+        }
+
+        private static class ArrayDataConcatenatorReflector
+        {
+            private static readonly Type s_arrayDataConcatenatorType = 
Assembly.Load("Apache.Arrow").GetType("Apache.Arrow.ArrayDataConcatenator");

Review comment:
       ```suggestion
               private static readonly Type s_arrayDataConcatenatorType = 
typeof(ArrayData).Assembly.GetType("Apache.Arrow.ArrayDataConcatenator");
   ```




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