LAB YCBCR tests

Author: JimBobSquarePants

tests/ImageSharp.Tests/ColorProfiles/CieLabAndYCbCrConversionTests.cs

@@ -0,0 +1,70 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using SixLabors.ImageSharp.ColorProfiles;
+
+namespace SixLabors.ImageSharp.Tests.ColorProfiles.Conversion;
+
+/// <summary>
+/// Tests <see cref="CieLab"/>-<see cref="YCbCr"/> conversions.
+/// </summary>
+public class CieLabAndYCbCrConversionTests
+{
+    private static readonly ApproximateColorProfileComparer Comparer = new(.0002F);
+
+    [Theory]
+    [InlineData(0, 128, 128, 0, 0, 0)]
+    [InlineData(87.4179, 133.9763, 247.5308, 55.06287, 82.54838, 23.1697)]
+    public void Convert_YCbCr_to_CieLab(float y, float cb, float cr, float l, float a, float b)
+    {
+        // Arrange
+        YCbCr input = new(y, cb, cr);
+        CieLab expected = new(l, a, b);
+        ColorProfileConverter converter = new();
+
+        Span<YCbCr> inputSpan = new YCbCr[5];
+        inputSpan.Fill(input);
+
+        Span<CieLab> actualSpan = new CieLab[5];
+
+        // Act
+        CieLab actual = converter.Convert<YCbCr, CieLab>(input);
+        converter.Convert<YCbCr, CieLab>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 128, 128)]
+    [InlineData(55.06287, 82.54838, 23.1697, 87.41701, 133.97232, 247.5314)]
+    public void Convert_CieLab_to_YCbCr(float l, float a, float b, float y, float cb, float cr)
+    {
+        // Arrange
+        CieLab input = new(l, a, b);
+        YCbCr expected = new(y, cb, cr);
+        ColorProfileConverter converter = new();
+
+        Span<CieLab> inputSpan = new CieLab[5];
+        inputSpan.Fill(input);
+
+        Span<YCbCr> actualSpan = new YCbCr[5];
+
+        // Act
+        YCbCr actual = converter.Convert<CieLab, YCbCr>(input);
+        converter.Convert<CieLab, YCbCr>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+}