From f56105393b2e9300dfba5cf4979578f7a99c176b Mon Sep 17 00:00:00 2001
From: Dmitry Pentin <riotbr3aker@gmail.com>
Date: Fri, 14 May 2021 19:14:53 +0300
Subject: [PATCH] Fixed a couple of failing tests

---
 src/ImageSharp/ImageFrameCollection.cs         | 7 ++++++-
 src/ImageSharp/ImageFrameCollection{TPixel}.cs | 7 ++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/ImageFrameCollection.cs b/src/ImageSharp/ImageFrameCollection.cs
index 53ab2bf7c1..ed36c16539 100644
--- a/src/ImageSharp/ImageFrameCollection.cs
+++ b/src/ImageSharp/ImageFrameCollection.cs
@@ -70,7 +70,12 @@ namespace SixLabors.ImageSharp
         /// <param name="source">The <seealso cref="ImageFrame"/> to clone and insert into the <seealso cref="ImageFrameCollection"/>.</param>
         /// <exception cref="ArgumentException">Frame must have the same dimensions as the image.</exception>
         /// <returns>The cloned <see cref="ImageFrame"/>.</returns>
-        public ImageFrame InsertFrame(int index, ImageFrame source) => this.NonGenericInsertFrame(index, source);
+        public ImageFrame InsertFrame(int index, ImageFrame source)
+        {
+            this.EnsureNotDisposed();
+
+            return this.NonGenericInsertFrame(index, source);
+        }
 
         /// <summary>
         /// Clones the <paramref name="source"/> frame and appends the clone to the end of the collection.
diff --git a/src/ImageSharp/ImageFrameCollection{TPixel}.cs b/src/ImageSharp/ImageFrameCollection{TPixel}.cs
index 92722494b1..13ae092c42 100644
--- a/src/ImageSharp/ImageFrameCollection{TPixel}.cs
+++ b/src/ImageSharp/ImageFrameCollection{TPixel}.cs
@@ -110,7 +110,12 @@ namespace SixLabors.ImageSharp
         }
 
         /// <inheritdoc />
-        public override int IndexOf(ImageFrame frame) => frame is ImageFrame<TPixel> specific ? this.IndexOf(specific) : -1;
+        public override int IndexOf(ImageFrame frame)
+        {
+            this.EnsureNotDisposed();
+
+            return frame is ImageFrame<TPixel> specific ? this.frames.IndexOf(specific) : -1;
+        }
 
         /// <summary>
         /// Determines the index of a specific <paramref name="frame"/> in the <seealso cref="ImageFrameCollection{TPixel}"/>.