Add support unit tests for ConcurrentHashSet, apache#1117 (apache#1128)

* Add support unit tests for ConcurrentHashSet, apache#1117

* Add Harmony Support_ unit tests, apache#1117

* Add IReadOnlySet for .NET 5+

src/Lucene.Net.Tests/Support/Support_CollectionTest.cs

@@ -0,0 +1,115 @@
+// Adapted from Apache Harmony tests via J2N: https://github.com/NightOwl888/J2N/blob/main/tests/NUnit/J2N.Tests/Collections/Support_CollectionTest.cs
+using Lucene.Net.Util;
+using System.Collections.Generic;
+using JCG = J2N.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.
+     */
+
+    public class Support_CollectionTest : LuceneTestCase
+    {
+        readonly ICollection<int> col; // must contain the Integers 0 to 99
+
+        // LUCENENET: removed unused string argument and overload
+        public Support_CollectionTest(/*String p1,*/ ICollection<int> c)
+            //: base(p1)
+        {
+            col = c;
+        }
+
+        public void RunTest()
+        {
+            new Support_UnmodifiableCollectionTest(col).RunTest();
+
+            // setup
+            ICollection<int> myCollection = new JCG.SortedSet<int>();
+            myCollection.Add(101);
+            myCollection.Add(102);
+            myCollection.Add(103);
+
+            // add
+            //assertTrue("CollectionTest - a) add did not work", col.Add(new Integer(
+            //        101)));
+            col.Add(101); // Does not return in .NET
+            assertTrue("CollectionTest - b) add did not work", col
+                    .Contains(101));
+
+            // remove
+            assertTrue("CollectionTest - a) remove did not work", col
+                    .Remove(101));
+            assertTrue("CollectionTest - b) remove did not work", !col
+                    .Contains(101));
+
+            if (col is ISet<int> set)
+            {
+                // addAll
+                //assertTrue("CollectionTest - a) addAll failed", set
+                //        .UnionWith(myCollection));
+                set.UnionWith(myCollection); // Does not return in .NET
+                assertTrue("CollectionTest - b) addAll failed", set
+                        .IsSupersetOf(myCollection));
+
+                // containsAll
+                assertTrue("CollectionTest - a) containsAll failed", set
+                        .IsSupersetOf(myCollection));
+                col.Remove(101);
+                assertTrue("CollectionTest - b) containsAll failed", !set
+                        .IsSupersetOf(myCollection));
+
+                // removeAll
+                //assertTrue("CollectionTest - a) removeAll failed", set
+                //        .ExceptWith(myCollection));
+                //assertTrue("CollectionTest - b) removeAll failed", !set
+                //        .ExceptWith(myCollection)); // should not change the colletion
+                //                                   // the 2nd time around
+
+                set.ExceptWith(myCollection); // Does not return in .NET
+                assertTrue("CollectionTest - c) removeAll failed", !set
+                        .Contains(102));
+                assertTrue("CollectionTest - d) removeAll failed", !set
+                        .Contains(103));
+
+                // retianAll
+                set.UnionWith(myCollection);
+                //assertTrue("CollectionTest - a) retainAll failed", set
+                //        .IntersectWith(myCollection));
+                //assertTrue("CollectionTest - b) retainAll failed", !set
+                //        .IntersectWith(myCollection)); // should not change the colletion
+                //                                   // the 2nd time around
+
+                set.IntersectWith(myCollection); // Does not return in .NET
+                assertTrue("CollectionTest - c) retainAll failed", set
+                        .IsSupersetOf(myCollection));
+                assertTrue("CollectionTest - d) retainAll failed", !set
+                        .Contains(0));
+                assertTrue("CollectionTest - e) retainAll failed", !set
+                        .Contains(50));
+
+            }
+
+            // clear
+            col.Clear();
+            assertTrue("CollectionTest - a) clear failed", col.Count == 0);
+            assertTrue("CollectionTest - b) clear failed", !col
+                    .Contains(101));
+
+        }
+
+    }
+}

src/Lucene.Net.Tests/Support/Support_SetTest.cs

@@ -0,0 +1,48 @@
+// Adapted from Apache Harmony tests: https://github.com/apache/harmony/blob/trunk/classlib/support/src/test/java/tests/support/Support_SetTest.java
+using Lucene.Net.Util;
+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.
+     */
+
+    public class Support_SetTest : LuceneTestCase
+    {
+        ISet<int> set; // must contain the Integers 0 to 99
+
+        // LUCENENET: removed unused string argument and overload
+        public Support_SetTest(/*String p1,*/ ISet<int> s)
+            //: base(p1)
+        {
+            set = s;
+        }
+
+        public void RunTest() {
+            // add
+            assertTrue("Set Test - Adding a duplicate element changed the set",
+                !set.Add(50));
+            assertTrue("Set Test - Removing an element did not change the set", set
+                .Remove(50));
+            assertTrue(
+                "Set Test - Adding and removing a duplicate element failed to remove it",
+                !set.Contains(50));
+            set.Add(50);
+            new Support_CollectionTest(set).RunTest();
+        }
+    }
+}

src/Lucene.Net.Tests/Support/Support_UnmodifiableCollectionTest.cs

@@ -0,0 +1,112 @@
+// Adapted from Apache Harmony tests via J2N: https://github.com/NightOwl888/J2N/blob/main/tests/NUnit/J2N.Tests/Collections/Support_UnmodifiableCollectionTest.cs
+
+using Lucene.Net.Util;
+using System.Collections.Generic;
+using System.Linq;
+
+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.
+     */
+
+    public class Support_UnmodifiableCollectionTest : LuceneTestCase
+    {
+        readonly ICollection<int> col;
+
+        // must be a collection containing the Integers 0 to 99 (which will iterate
+        // in order)
+
+        // LUCENENET: removed unused string argument and overload
+        public Support_UnmodifiableCollectionTest(/*String p1,*/ ICollection<int> c)
+        //: base(p1)
+        {
+            col = c;
+        }
+
+        public void RunTest()
+        {
+
+            // contains
+            assertTrue("UnmodifiableCollectionTest - should contain 0", col
+                    .Contains(0));
+            assertTrue("UnmodifiableCollectionTest - should contain 50", col
+                    .Contains(50));
+            assertTrue("UnmodifiableCollectionTest - should not contain 100", !col
+                    .Contains(100));
+
+            // containsAll
+            HashSet<int> hs = new HashSet<int>();
+            hs.Add(0);
+            hs.Add(25);
+            hs.Add(99);
+            assertTrue(
+                    "UnmodifiableCollectionTest - should contain set of 0, 25, and 99",
+                    col.Intersect(hs).Count() == hs.Count); // Contains all
+            hs.Add(100);
+            assertTrue(
+                    "UnmodifiableCollectionTest - should not contain set of 0, 25, 99 and 100",
+                    col.Intersect(hs).Count() != hs.Count); // Doesn't contain all
+
+            // isEmpty
+            assertTrue("UnmodifiableCollectionTest - should not be empty", col.Count > 0);
+
+            // iterator
+            IEnumerator<int> it = col.GetEnumerator();
+            SortedSet<int> ss = new SortedSet<int>();
+            while (it.MoveNext())
+            {
+                ss.Add(it.Current);
+            }
+            it = ss.GetEnumerator();
+            for (int counter = 0; it.MoveNext(); counter++)
+            {
+                int nextValue = it.Current;
+                assertTrue(
+                        "UnmodifiableCollectionTest - Iterator returned wrong value.  Wanted: "
+                                + counter + " got: " + nextValue,
+                        nextValue == counter);
+            }
+
+            // size
+            assertTrue(
+                    "UnmodifiableCollectionTest - returned wrong size.  Wanted 100, got: "
+                            + col.Count, col.Count == 100);
+
+            // toArray
+            object[] objArray;
+            objArray = col.Cast<object>().ToArray();
+            it = ss.GetEnumerator(); // J2N: Bug in Harmony, this needs to be reset to run
+            for (int counter = 0; it.MoveNext(); counter++)
+            {
+                assertTrue(
+                        "UnmodifiableCollectionTest - toArray returned incorrect array",
+                        (int)objArray[counter] == it.Current);
+            }
+
+            // toArray (Object[])
+            var intArray = new int[100];
+            col.CopyTo(intArray, 0);
+            it = ss.GetEnumerator(); // J2N: Bug in Harmony, this needs to be reset to run
+            for (int counter = 0; it.MoveNext(); counter++)
+            {
+                assertTrue(
+                        "UnmodifiableCollectionTest - CopyTo(object[], int) filled array incorrectly",
+                        intArray[counter] == it.Current);
+            }
+        }
+    }
+}