Several hints removed & code cleaned up.

Recyclable.CollectionsTests/EnumerableWithoutCount.cs

@@ -4,7 +4,7 @@ namespace Recyclable.CollectionsTests
 {
 	public class EnumerableWithoutCount<T> : IEnumerable<T>
 	{
-		private IEnumerable<T> _testData;
+		private readonly IEnumerable<T> _testData;
 
 		public EnumerableWithoutCount(IEnumerable<T> testData)
 		{

Recyclable.CollectionsTests/ItemRangesIteratorTests.cs

@@ -127,7 +127,6 @@ namespace Recyclable.CollectionsTests
 					(9, 0, 1),
 				}
 			},
-
 		};
 	}
 }

Recyclable.CollectionsTests/RecyclableArrayListTests.cs

@@ -217,7 +217,6 @@ namespace Recyclable.CollectionsTests
 			// Validate			
 			_ = list.Count.Should().Be(0);
 			_ = list.Should().BeEmpty();
-
 		}
 
 		[Theory]
@@ -350,10 +349,7 @@ namespace Recyclable.CollectionsTests
 
 			// Act
 			var yieldedItems = new List<long>((int)itemsCount);
-			foreach (var item in list)
-			{
-				yieldedItems.Add(item);
-			}
+			yieldedItems.AddRange(list);
 
 			// Validate
 			_ = yieldedItems.Count.Should().Be((int)itemsCount);
@@ -549,8 +545,7 @@ namespace Recyclable.CollectionsTests
 				// Validate
 				_ = list.Count.Should().Be((int)(itemsCount - deleted));
 				_ = list.Should().ContainInConsecutiveOrder(testData.Take((int)(itemsCount - deleted)));
-
 			}
 		}
 	}
-} 
+}

Recyclable.CollectionsTests/RecyclableListTestData.cs

@@ -54,7 +54,6 @@ namespace Recyclable.CollectionsTests
 							CreateTestData(itemsCount).ToRecyclableList(sourceBlockSize),
 							itemsCount
 					};
-
 				}
 
 				yield return new object[] { $"IList<int>(itemsCount: {itemsCount})", new CustomIList<long>(CreateTestData(itemsCount)), itemsCount };
@@ -64,7 +63,7 @@ namespace Recyclable.CollectionsTests
 		}
 
 		public static IEnumerable<object[]> SourceDataVariants => CreateSourceDataVariants().ToArray();
-			
+
 		private static IEnumerable<object[]> CreateSourceEmptyDataVariants() => new[]
 		{
 			new object[] { "int[]", Array.Empty<long>() },