Added new tests to RecyclableArrayListTest for Clear and IndexOf.

Recyclable.CollectionsTests/RecyclableArrayListTests.cs

@@ -254,5 +254,36 @@ namespace Recyclable.CollectionsTests
 				.And.ContainInConsecutiveOrder(testData)
 				.And.BeEquivalentTo(testData);
 		}
+		[Fact]
+		public void ClearShouldRemoveAllItems()
+		{
+			// Prepare
+			var testData = _testData.ToArray();
+			var list = new RecyclableArrayList<int>(testData);
+			_ = list.Count.Should().NotBe(0);
+
+			// Act		
+			list.Clear();
+
+			// Validate			
+			_ = list.Count.Should().Be(0);
+			_ = list.Should().HaveCount(0);
+
+		}
+
+		[Fact]
+		public void IndexOfShouldFindTheIndexes()
+		{
+			// Prepare
+			var testData = _testData.ToArray();
+			using var list = new RecyclableArrayList<int>(testData);
+
+			// Act & Validate
+			foreach (var index in _testData.ToArray())
+			{
+				var actual = list.IndexOf(index);
+				_ = actual.Should().Be(index - 1);
+			}
+		}
 	}
 }