Add unit tests for hashtable with classes as keys

Author: josesimoes

Tests/HashtableTests/HashtableTests.cs

@@ -677,6 +677,24 @@ public void Hashtable_InsertNullKey()
             }, "No exception was thrown when adding a NULL key.");
         }
 
+        [TestMethod]
+        public void Hashtable_ClassAsKey()
+        {
+            var hashtable = new Hashtable();
+
+            for (int i = 0; i < 100; i++)
+            {
+                SomeKey key = new SomeKey();
+
+                hashtable.Add(key, key.GetHashCode());
+            }
+
+            foreach (var key in hashtable.Keys)
+            {
+                Assert.AreEqual(key.GetHashCode(), (int)hashtable[key]);
+            }
+        }
+
         #region helper classes and methods
 
         /// <summary>
@@ -783,6 +801,10 @@ public static Hashtable CreateStringHashtable(int count, int start = 0)
             return hashtable;
         }
 
+        public class SomeKey
+        {
+        }
+
         private class Foo
         {
             public string StringValue { get; set; } = "Hello World";