Adding tests for .Equals for all colours.

tests/ImageSharp.Tests/Colors/ColorEqualityTests.cs

@@ -0,0 +1,51 @@
+// <copyright file="ColorEqualityTests.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Tests.Colors
+{
+    using System.Numerics;
+    using Xunit;
+
+    /// <summary>
+    /// Test implementations of IEquatable
+    /// </summary>
+    public class ColorEqualityTests
+    {
+        public static readonly TheoryData<object, object> EqualityData =
+           new TheoryData<object, object>()
+           {
+               { new Alpha8(.5F), new Alpha8(.5F) },
+               { new Argb(Vector4.One), new Argb(Vector4.One) },
+               { new Bgr565(Vector3.One), new Bgr565(Vector3.One) },
+               { new Bgra4444(Vector4.One), new Bgra4444(Vector4.One) },
+               { new Bgra5551(Vector4.One), new Bgra5551(Vector4.One) },
+               { new Byte4(Vector4.One * 255), new Byte4(Vector4.One * 255) },
+               { new HalfSingle(-1F), new HalfSingle(-1F) },
+               { new HalfVector2(0.1f, -0.3f), new HalfVector2(0.1f, -0.3f) },
+               { new HalfVector4(Vector4.One), new HalfVector4(Vector4.One) },
+               { new NormalizedByte2(-Vector2.One), new NormalizedByte2(-Vector2.One) },
+               { new NormalizedByte4(Vector4.One), new NormalizedByte4(Vector4.One) },
+               { new NormalizedShort2(Vector2.One), new NormalizedShort2(Vector2.One) },
+               { new NormalizedShort4(Vector4.One), new NormalizedShort4(Vector4.One) },
+               { new Rg32(Vector2.One), new Rg32(Vector2.One) },
+               { new Rgba1010102(Vector4.One), new Rgba1010102(Vector4.One) },
+               { new Rgba64(Vector4.One), new Rgba64(Vector4.One) },
+               { new Short2(Vector2.One * 0x7FFF), new Short2(Vector2.One * 0x7FFF) },
+               { new Short4(Vector4.One * 0x7FFF), new Short4(Vector4.One * 0x7FFF) },
+           };
+
+        [Theory]
+        [MemberData("EqualityData")]
+        public void EqualsOperator(object first, object second)
+        {
+            // Act
+            var equal = first.Equals(second);
+
+            // Assert
+            Assert.True(equal);
+        }
+
+    }
+}