From 55de3ccc52dfd1fd30969a852db03aecffb461c6 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Thu, 4 Apr 2024 16:06:13 +1000
Subject: [PATCH] Add more LAB tests

---
 .../CieLabAndCieLchuvConversionTests.cs       | 76 +++++++++++++++++++
 .../CieLabAndCieLuvConversionTests.cs         | 76 +++++++++++++++++++
 2 files changed, 152 insertions(+)
 create mode 100644 tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLchuvConversionTests.cs
 create mode 100644 tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLuvConversionTests.cs

diff --git a/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLchuvConversionTests.cs b/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLchuvConversionTests.cs
new file mode 100644
index 000000000..d7f2df95b
--- /dev/null
+++ b/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLchuvConversionTests.cs
@@ -0,0 +1,76 @@
+// 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="CieLchuv"/> conversions.
+/// </summary>
+/// <remarks>
+/// Test data generated using:
+/// <see href="http://www.brucelindbloom.com/index.html?ColorCalculator.html"/>
+/// </remarks>
+public class CieLabAndCieLchuvConversionTests
+{
+    private static readonly ApproximateColorProfileComparer Comparer = new(.0002F);
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 0, 0)]
+    [InlineData(30.66194, 200, 352.7564, 31.95653, 116.8745, 2.388602)]
+    public void Convert_Lchuv_to_Lab(float l, float c, float h, float l2, float a, float b)
+    {
+        // Arrange
+        CieLchuv input = new(l, c, h);
+        CieLab expected = new(l2, a, b);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D65, TargetWhitePoint = Illuminants.D50 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLchuv> inputSpan = new CieLchuv[5];
+        inputSpan.Fill(input);
+
+        Span<CieLab> actualSpan = new CieLab[5];
+
+        // Act
+        CieLab actual = converter.Convert<CieLchuv, CieLab>(input);
+        converter.Convert<CieLchuv, 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, 0, 0)]
+    [InlineData(36.0555, 303.6901, 10.01514, 29.4713573, 200, 352.6346)]
+    public void Convert_Lab_to_Lchuv(float l, float a, float b, float l2, float c, float h)
+    {
+        // Arrange
+        CieLab input = new(l, a, b);
+        CieLchuv expected = new(l2, c, h);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D50, TargetWhitePoint = Illuminants.D65 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLab> inputSpan = new CieLab[5];
+        inputSpan.Fill(input);
+
+        Span<CieLchuv> actualSpan = new CieLchuv[5];
+
+        // Act
+        CieLchuv actual = converter.Convert<CieLab, CieLchuv>(input);
+        converter.Convert<CieLab, CieLchuv>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+}
diff --git a/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLuvConversionTests.cs b/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLuvConversionTests.cs
new file mode 100644
index 000000000..17df78bdf
--- /dev/null
+++ b/tests/ImageSharp.Tests/ColorProfiles/CieLabAndCieLuvConversionTests.cs
@@ -0,0 +1,76 @@
+// 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="CieLuv"/> conversions.
+/// </summary>
+/// <remarks>
+/// Test data generated using:
+/// <see href="http://www.brucelindbloom.com/index.html?ColorCalculator.html"/>
+/// </remarks>
+public class CieLabAndCieLuvConversionTests
+{
+    private static readonly ApproximateColorProfileComparer Comparer = new(.0002F);
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 0, 0)]
+    [InlineData(10, 36.0555, 303.6901, 10.6006718, -17.24077, 82.8835)]
+    public void Convert_CieLuv_to_CieLab(float l, float u, float v, float l2, float a, float b)
+    {
+        // Arrange
+        CieLuv input = new(l, u, v);
+        CieLab expected = new(l2, a, b);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D65, TargetWhitePoint = Illuminants.D50 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLuv> inputSpan = new CieLuv[5];
+        inputSpan.Fill(input);
+
+        Span<CieLab> actualSpan = new CieLab[5];
+
+        // Act
+        CieLab actual = converter.Convert<CieLuv, CieLab>(input);
+        converter.Convert<CieLuv, 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, 0, 0)]
+    [InlineData(10.0151367, -23.9644356, 17.0226, 10.0000038, -12.830183, 15.1829338)]
+    public void Convert_CieLab_to_CieLuv(float l, float a, float b, float l2, float u, float v)
+    {
+        // Arrange
+        CieLab input = new(l, a, b);
+        CieLuv expected = new(l2, u, v);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D50, TargetWhitePoint = Illuminants.D65 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLab> inputSpan = new CieLab[5];
+        inputSpan.Fill(input);
+
+        Span<CieLuv> actualSpan = new CieLuv[5];
+
+        // Act
+        CieLuv actual = converter.Convert<CieLab, CieLuv>(input);
+        converter.Convert<CieLab, CieLuv>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+}