Add tests for fax4 compression

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

@@ -23,14 +23,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
     {
         public static readonly string[] MultiframeTestImages = Multiframes;
 
-        public static readonly string[] NotSupportedImages = NotSupported;
-
         private static TiffDecoder TiffDecoder => new TiffDecoder();
 
         private static MagickReferenceDecoder ReferenceDecoder => new MagickReferenceDecoder();
 
         [Theory]
-        [WithFileCollection(nameof(NotSupportedImages), PixelTypes.Rgba32)]
+        [WithFile(Calliphora_RgbJpeg, PixelTypes.Rgba32)]
+        [WithFile(RgbJpeg, PixelTypes.Rgba32)]
+        [WithFile(RgbUncompressedTiled, PixelTypes.Rgba32)]
+        [WithFile(MultiframeDifferentSize, PixelTypes.Rgba32)]
+        [WithFile(MultiframeDifferentVariants, PixelTypes.Rgba32)]
         public void ThrowsNotSupported<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel> => Assert.Throws<NotSupportedException>(() => provider.GetImage(TiffDecoder));
 
@@ -356,6 +358,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         public void TiffDecoder_CanDecode_Fax3Compressed<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 
+        [Theory]
+        [WithFile(Fax4Compressed, PixelTypes.Rgba32)]
+        [WithFile(Fax4CompressedLowerOrderBitsFirst, PixelTypes.Rgba32)]
+        [WithFile(Calliphora_Fax4Compressed, PixelTypes.Rgba32)]
+        public void TiffDecoder_CanDecode_Fax4Compressed<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
+
         [Theory]
         [WithFile(CcittFax3LowerOrderBitsFirst, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_Compressed_LowerOrderBitsFirst<TPixel>(TestImageProvider<TPixel> provider)

tests/ImageSharp.Tests/TestImages.cs

@@ -534,6 +534,8 @@ namespace SixLabors.ImageSharp.Tests
             public const string Calliphora_Fax4Compressed = "Tiff/Calliphora_ccitt_fax4.tiff";
             public const string Calliphora_HuffmanCompressed = "Tiff/Calliphora_huffman_rle.tiff";
             public const string Calliphora_BiColorUncompressed = "Tiff/Calliphora_bicolor_uncompressed.tiff";
+            public const string Fax4Compressed = "Tiff/basi3p02_fax4.tiff";
+            public const string Fax4CompressedLowerOrderBitsFirst = "Tiff/basi3p02_fax4_lowerOrderBitsFirst.tiff";
 
             public const string CcittFax3AllTermCodes = "Tiff/ccitt_fax3_all_terminating_codes.tiff";
             public const string CcittFax3AllMakeupCodes = "Tiff/ccitt_fax3_all_makeup_codes.tiff";
@@ -658,8 +660,6 @@ namespace SixLabors.ImageSharp.Tests
             public static readonly string[] Multiframes = { MultiframeDeflateWithPreview, MultiframeLzwPredictor /*, MultiFrameDifferentSize, MultiframeDifferentSizeTiled, MultiFrameDifferentVariants,*/ };
 
             public static readonly string[] Metadata = { SampleMetadata };
-
-            public static readonly string[] NotSupported = { Calliphora_RgbJpeg, RgbJpeg, RgbUncompressedTiled, MultiframeDifferentSize, MultiframeDifferentVariants, Calliphora_Fax4Compressed, Fax4_Motorola };
         }
     }
 }

tests/Images/Input/Tiff/Calliphora_ccitt_fax4.tiff

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7a2c95aec08b96bca30af344f7d9952a603a951802ce534a5f2c5f563795cbd2
-size 117704
+oid sha256:b8c7f712f9e7d1feeeb55e7743f6ce7d66bc5292f4786ea8526d95057d73145e
+size 4534

tests/Images/Input/Tiff/basi3p02_fax4.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:185ae3c4174b323adcf811d125cd77b71768406845923f50395c0baebff57b7c
+size 282

tests/Images/Input/Tiff/basi3p02_fax4_lowerOrderBitsFirst.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a19eb117f194718575681a81a4fbe7fe4a1b82b99113707295194090fb935784
+size 282

tests/Images/Input/Tiff/basi3p02_fax4_minisblack.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:af0d8f3c18f96228aa369bc295201a1bfe1b044c23991ff168401adc5402ebb6
+size 308