RecyclableLongList.CopyFollowingItems performance improvements. Benchmarks added. Tests cleanup & normalization. Before cleanup.

Recyclable.Collections.Benchmarks/POC/RecyclableLongListHelpers.CopyFollowingItems.Benchmarks.cs

@@ -0,0 +1,36 @@
+using BenchmarkDotNet.Attributes;
+
+namespace Recyclable.Collections.Benchmarks.POC
+{
+	public enum RecyclableLongListHelpersCopyFollowingItemsBenchmarkType
+	{
+		Undefined,
+		Old,
+		New,
+	}
+
+	public class RecyclableLongListHelpersCopyFollowingItemsBenchmarks : RecyclableBenchmarkBase<RecyclableLongListHelpersCopyFollowingItemsBenchmarkType>
+	{
+		[Params(RecyclableLongListHelpersCopyFollowingItemsBenchmarkType.Old)]
+		public override RecyclableLongListHelpersCopyFollowingItemsBenchmarkType BaseDataType { get => base.BaseDataType; set => base.BaseDataType = value; }
+
+		[Params(RecyclableLongListHelpersCopyFollowingItemsBenchmarkType.New)]
+		public override RecyclableLongListHelpersCopyFollowingItemsBenchmarkType DataType { get => base.DataType; set => base.DataType = value; }
+
+		protected override Action GetTestMethod(RecyclableLongListHelpersCopyFollowingItemsBenchmarkType benchmarkType) => benchmarkType switch
+        {
+            RecyclableLongListHelpersCopyFollowingItemsBenchmarkType.Old => CopyFollowingItemsOld,
+            RecyclableLongListHelpersCopyFollowingItemsBenchmarkType.New => CopyFollowingItemsNew,
+            _ => throw CreateUnknownBenchmarkTypeException(benchmarkType),
+        };
+
+		protected override void PrepareData<RecyclableLongListHelpersCopyFollowingItemsBenchmarkType>(RecyclableLongListHelpersCopyFollowingItemsBenchmarkType benchmarkType)
+		{
+			base.PrepareData(RecyclableCollectionsBenchmarkSource.Array);
+			base.PrepareData(RecyclableCollectionsBenchmarkSource.RecyclableLongList);
+		}
+
+		public void CopyFollowingItemsOld() => RecyclableLongList<long>.Helpers.CopyFollowingItemsOld(TestObjectsAsRecyclableLongList, 0);
+		public void CopyFollowingItemsNew() => RecyclableLongList<long>.Helpers.CopyFollowingItems(TestObjectsAsRecyclableLongList, 0);
+	}
+}