NightOwl888 commented on code in PR #1129:
URL: https://github.com/apache/lucenenet/pull/1129#discussion_r1957255527


##########
src/Lucene.Net.Tests/Support/TestConcurrentSet.cs:
##########
@@ -0,0 +1,42 @@
+// Some tests adapted from Apache Harmony:
+// 
https://github.com/apache/harmony/blob/02970cb7227a335edd2c8457ebdde0195a735733/classlib/modules/concurrent/src/test/java/ConcurrentHashMapTest.java
+// 
https://github.com/apache/harmony/blob/02970cb7227a335edd2c8457ebdde0195a735733/classlib/modules/luni/src/test/api/common/org/apache/harmony/luni/tests/java/util/CollectionsTest.java
+
+using Lucene.Net.Support;
+using System.Collections.Generic;
+
+namespace Lucene.Net
+{
+    /*
+     * 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.
+     */
+
+    /// <summary>
+    /// Tests for <see cref="ConcurrentSet{T}"/>.
+    /// </summary>
+    /// <remarks>
+    /// See the <see cref="TestConcurrentSetBase"/> class for most of the test 
cases.
+    /// This class specializes the tests for the <see 
cref="ConcurrentSet{T}"/> class.
+    /// </remarks>
+    public class TestConcurrentSet : TestConcurrentSetBase
+    {
+        protected override ISet<T> NewSet<T>()
+            => new ConcurrentSet<T>(new HashSet<T>());

Review Comment:
   It would also be good to have a concurrency test that uses the `SyncRoot` 
property to synchronize external work while other threads are attempting to use 
the set, just to ensure it is implemented correctly.



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