RecyclableCollectionsBenchmarks split into multiple files.

Recyclable.Collections.Benchmarks/Benchmarks/Contains_FirstItems.cs

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+using BenchmarkDotNet.Attributes;
+
+namespace Recyclable.Collections.Benchmarks
+{
+	public partial class RecyclableCollectionsBenchmarks
+	{
+		//[Benchmark(Baseline = false)]
+		public void Array_Contains_FirstItems()
+		{
+			var data = TestObjects;
+			var list = TestObjects;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing(Array.IndexOf(list, data[i]) >= 0);
+			}
+		}
+
+		//[Benchmark(Baseline = false)]
+		public void List_Contains_FirstItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing(list.Contains(data[i]));
+			}
+		}
+
+		//[Benchmark(Baseline = true)]
+		public void PooledList_Contains_FirstItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsPooledList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing(list.Contains(data[i]));
+			}
+		}
+
+		//[Benchmark(Baseline = false)]
+		public void RecyclableArrayList_Contains_FirstItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsRecyclableArrayList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing(list.Contains(data[i]));
+			}
+		}
+
+		//[Benchmark(Baseline = false)]
+		public void RecyclableList_Contains_FirstItems()
+		{
+			var data = TestObjects;
+			var list = TestObjectsAsRecyclableList;
+			var dataCount = TestObjectCount / 10 > 0 ? TestObjectCount / 10 : TestObjectCount;
+			for (var i = 0; i < dataCount; i++)
+			{
+				DoNothing(list.Contains(data[i]));
+			}
+		}
+	}
+}