Add test for lossy with exif which does not contain enough data

tests/ImageSharp.Tests/Formats/WebP/WebpMetaDataTests.cs

@@ -150,5 +150,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Webp
             Assert.NotNull(actualExif);
             Assert.Equal(expectedExif.Values.Count, actualExif.Values.Count);
         }
+
+        [Theory]
+        [WithFile(TestImages.Webp.Lossy.WithExifNotEnoughData, PixelTypes.Rgba32)]
+        public void WebpDecoder_ThrowInvalidImageContentException_OnWithInvalidExifData<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel> =>
+            Assert.Throws<InvalidImageContentException>(
+                () =>
+                {
+                    using (provider.GetImage(WebpDecoder))
+                    {
+                    }
+                });
     }
 }

tests/ImageSharp.Tests/TestImages.cs

@@ -635,6 +635,7 @@ namespace SixLabors.ImageSharp.Tests
             {
                 public const string Earth = "Webp/earth_lossy.webp";
                 public const string WithExif = "Webp/exif_lossy.webp";
+                public const string WithExifNotEnoughData = "Webp/exif_lossy_not_enough_data.webp";
                 public const string WithIccp = "Webp/lossy_with_iccp.webp";
                 public const string WithXmp = "Webp/xmp_lossy.webp";
                 public const string BikeSmall = "Webp/bike_lossless_small.webp";

tests/Images/Input/Webp/exif_lossy_not_enough_data.webp

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fdf4e9b20af4168f4177d33f7f502906343bbaaae2af9b90e1531bd4452b317b
+size 40765