Add colorspace equality tests

tests/ImageSharp.Tests/Colors/Colorspaces/ColorSpaceEqualityTests.cs

@@ -0,0 +1,237 @@
+// <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;
+    using System.Numerics;
+    using Xunit;
+
+    using ImageSharp.Colors.Spaces;
+
+    /// <summary>
+    /// Test implementations of IEquatable and IAlmostEquatable in our colorspaces
+    /// </summary>
+    public class ColorSpaceEqualityTests
+    {
+        public static readonly TheoryData<object, object, Type> EqualityData =
+           new TheoryData<object, object, Type>()
+           {
+               { new CieLab(Vector3.One), new CieLab(Vector3.One), typeof(CieLab) },
+               { new CieLch(Vector3.One), new CieLch(Vector3.One), typeof(CieLch) },
+               { new CieXyz(Vector3.One), new CieXyz(Vector3.One), typeof(CieXyz) },
+           };
+
+        public static readonly TheoryData<object, object, Type> NotEqualityDataNulls =
+            new TheoryData<object, object, Type>()
+            {
+                // Valid object against null
+               { new CieLab(Vector3.One), null, typeof(CieLab) },
+               { new CieLch(Vector3.One), null, typeof(CieLch) },
+               { new CieXyz(Vector3.One), null, typeof(CieXyz) },
+            };
+
+        public static readonly TheoryData<object, object, Type> NotEqualityDataDifferentObjects =
+           new TheoryData<object, object, Type>()
+           {
+                // Valid objects of different types but not equal
+                { new CieLab(Vector3.One), new CieLch(Vector3.Zero), null },
+                { new CieXyz(Vector3.One), new HunterLab(Vector3.Zero), null },
+                { new Rgb(Vector3.One), new LinearRgb(Vector3.Zero), null },
+                { new Rgb(Vector3.One), new Lms(Vector3.Zero), null },
+           };
+
+        public static readonly TheoryData<object, object, Type> NotEqualityData =
+           new TheoryData<object, object, Type>()
+           {
+                // Valid objects of the same type but not equal
+               { new CieLab(Vector3.One), new CieLab(Vector3.Zero), typeof(CieLab) },
+               { new CieLch(Vector3.One), new CieLch(Vector3.Zero), typeof(CieLch) },
+               { new CieXyz(Vector3.One), new CieXyz(Vector3.Zero), typeof(CieXyz) },
+           };
+
+        public static readonly TheoryData<object, object, Type, float> AlmostEqualsData =
+            new TheoryData<object, object, Type, float>()
+            {
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, 0F), typeof(CieLab), 0F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, 0F), typeof(CieLab), .001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, 0F), typeof(CieLab), .0001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, 0F), typeof(CieLab), .0005F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, .001F, 0F), typeof(CieLab), .001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, .0001F), typeof(CieLab), .0001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(.0005F, 0F, 0F), typeof(CieLab), .0005F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380F, 380F, 380F), typeof(CieXyz), 0F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380.001F, 380F, 380F), typeof(CieXyz), .01F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380F, 380.001F, 380F), typeof(CieXyz), .01F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380F, 380F, 380.001F), typeof(CieXyz), .01F },
+            };
+
+        public static readonly TheoryData<object, object, Type, float> AlmostNotEqualsData =
+            new TheoryData<object, object, Type, float>()
+            {
+                { new CieLab(0F, 0F, 0F), new CieLab(0.1F, 0F, 0F), typeof(CieLab), .001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0.1F, 0F), typeof(CieLab), .001F },
+                { new CieLab(0F, 0F, 0F), new CieLab(0F, 0F, 0.1F), typeof(CieLab), .001F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380.1F, 380F, 380F), typeof(CieXyz), .001F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380F, 380.1F, 380F), typeof(CieXyz), .001F },
+                { new CieXyz(380F, 380F, 380F), new CieXyz(380F, 380F, 380.1F), typeof(CieXyz), .001F },
+            };
+
+        [Theory]
+        [MemberData(nameof(EqualityData))]
+        public void Equality(object first, object second, Type type)
+        {
+            // Act
+            bool equal = first.Equals(second);
+
+            // Assert
+            Assert.True(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(NotEqualityDataNulls))]
+        [MemberData(nameof(NotEqualityDataDifferentObjects))]
+        [MemberData(nameof(NotEqualityData))]
+        public void NotEquality(object first, object second, Type type)
+        {
+            // Act
+            bool equal = first.Equals(second);
+
+            // Assert
+            Assert.False(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(EqualityData))]
+        public void HashCodeEqual(object first, object second, Type type)
+        {
+            // Act
+            bool equal = first.GetHashCode() == second.GetHashCode();
+
+            // Assert
+            Assert.True(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(NotEqualityDataDifferentObjects))]
+        public void HashCodeNotEqual(object first, object second, Type type)
+        {
+            // Act
+            bool equal = first.GetHashCode() == second.GetHashCode();
+
+            // Assert
+            Assert.False(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(EqualityData))]
+        public void EqualityObject(object first, object second, Type type)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic equal = firstObject.Equals(secondObject);
+
+            // Assert
+            Assert.True(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(NotEqualityData))]
+        public void NotEqualityObject(object first, object second, Type type)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic equal = firstObject.Equals(secondObject);
+
+            // Assert
+            Assert.False(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(EqualityData))]
+        public void EqualityOperator(object first, object second, Type type)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic equal = firstObject == secondObject;
+
+            // Assert
+            Assert.True(equal);
+        }
+
+        [Theory]
+        [MemberData(nameof(NotEqualityData))]
+        public void NotEqualityOperator(object first, object second, Type type)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic notEqual = firstObject != secondObject;
+
+            // Assert
+            Assert.True(notEqual);
+        }
+
+        [Theory]
+        [MemberData(nameof(AlmostEqualsData))]
+        public void AlmostEquals(object first, object second, Type type, float precision)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic almostEqual = firstObject.AlmostEquals(secondObject, precision);
+
+            // Assert
+            Assert.True(almostEqual);
+        }
+
+        [Theory]
+        [MemberData(nameof(AlmostNotEqualsData))]
+        public void AlmostNotEquals(object first, object second, Type type, float precision)
+        {
+            // Arrange
+            // Cast to the known object types, this is so that we can hit the
+            // equality operator on the concrete type, otherwise it goes to the
+            // default "object" one :)
+            dynamic firstObject = Convert.ChangeType(first, type);
+            dynamic secondObject = Convert.ChangeType(second, type);
+
+            // Act
+            dynamic almostEqual = firstObject.AlmostEquals(secondObject, precision);
+
+            // Assert
+            Assert.False(almostEqual);
+        }
+
+    }
+}