feat: ScrollQueue - added OnItemTrimmed event

ICD.Common.Utils.Tests/Collections/ScrollQueueTest.cs

@@ -2,6 +2,7 @@
 using ICD.Common.Properties;
 using NUnit.Framework;
 using ICD.Common.Utils.Collections;
+using ICD.Common.Utils.EventArguments;
 
 namespace ICD.Common.Utils.Tests.Collections
 {
@@ -76,5 +77,43 @@ namespace ICD.Common.Utils.Tests.Collections
 
 			Assert.AreEqual(0, test.Peek());
 		}
+
+		[Test, UsedImplicitly]
+		public void OnItemTrimmedTest()
+		{
+			ScrollQueue<int> test = new ScrollQueue<int>(3);
+
+			int? removedItem = null;
+
+			test.OnItemTrimmed += (sender, args) => removedItem = args.Data;
+
+			test.Enqueue(1);
+			test.Enqueue(2);
+			test.Enqueue(3);
+
+			Assert.IsNull(removedItem, "Raised Early");
+
+			test.Enqueue(4);
+
+			Assert.True(removedItem.HasValue, "Not Raised");
+			if (removedItem.HasValue)
+				Assert.AreEqual(1, removedItem.Value, "Incorrect Value");
+
+			removedItem = null;
+
+			test.Enqueue(5);
+
+			Assert.True(removedItem.HasValue, "Not Raised");
+			if (removedItem.HasValue)
+				Assert.AreEqual(2, removedItem.Value, "Incorrect Value");
+
+			removedItem = null;
+
+			test.MaxSize = 4;
+
+			test.Enqueue(6);
+
+			Assert.False(removedItem.HasValue, "Raised Early");
+		}
 	}
 }