Add min is white 16 bit gray big endian test file

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -143,6 +143,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         [WithFile(Flower16BitGrayLittleEndian, PixelTypes.Rgba32)]
         [WithFile(Flower16BitGray, PixelTypes.Rgba32)]
         [WithFile(Flower16BitGrayMinIsWhiteLittleEndian, PixelTypes.Rgba32)]
+        [WithFile(Flower16BitGrayMinIsWhiteBigEndian, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 

tests/ImageSharp.Tests/TestImages.cs

@@ -586,6 +586,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string Flower16BitGray = "Tiff/flower-minisblack-16.tiff";
             public const string Flower16BitGrayLittleEndian = "Tiff/flower-minisblack-16_lsb.tiff";
             public const string Flower16BitGrayMinIsWhiteLittleEndian = "Tiff/flower-miniswhite-16_lsb.tiff";
+            public const string Flower16BitGrayMinIsWhiteBigEndian = "Tiff/flower-miniswhite-16.tiff";
             public const string Issues1716Rgb161616BitLittleEndian = "Tiff/Issues/Issue1716.tiff";
 
             public const string SmallRgbDeflate = "Tiff/rgb_small_deflate.tiff";

tests/Images/Input/Tiff/flower-miniswhite-16.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d8f2c2afd8f1645717087bd2edbc3e8a46b88a54a4996c0e9350fdd652b5c382
+size 6588