Adding test for not equals for all colours.

tests/ImageSharp.Tests/Colors/ColorEqualityTests.cs

@@ -36,9 +36,56 @@ namespace ImageSharp.Tests.Colors
                { new Short4(Vector4.One * 0x7FFF), new Short4(Vector4.One * 0x7FFF) },
            };
 
+        public static readonly TheoryData<object, object> NotEqualityData =
+           new TheoryData<object, object>()
+           {
+                // Valid object against null
+                { new Alpha8(.5F), null },
+                { new Argb(Vector4.One), null },
+                { new Bgr565(Vector3.One), null },
+                { new Bgra4444(Vector4.One), null },
+                { new Bgra5551(Vector4.One), null },
+                { new Byte4(Vector4.One * 255), null },
+                { new HalfSingle(-1F), null },
+                { new HalfVector2(0.1f, -0.3f), null },
+                { new HalfVector4(Vector4.One), null },
+                { new NormalizedByte2(-Vector2.One), null },
+                { new NormalizedByte4(Vector4.One), null },
+                { new NormalizedShort2(Vector2.One), null },
+                { new NormalizedShort4(Vector4.One), null },
+                { new Rg32(Vector2.One), null },
+                { new Rgba1010102(Vector4.One), null },
+                { new Rgba64(Vector4.One), null },
+                { new Short2(Vector2.One * 0x7FFF), null },
+                { new Short4(Vector4.One * 0x7FFF), null },
+
+                // Valid objects of the same type but not equal
+                { new Alpha8(.5F), new Alpha8(.8F) },
+                { new Argb(Vector4.One), new Argb(Vector4.Zero) },
+                { new Bgr565(Vector3.One), new Bgr565(Vector3.Zero) },
+                { new Bgra4444(Vector4.One), new Bgra4444(Vector4.Zero) },
+                { new Bgra5551(Vector4.One), new Bgra5551(Vector4.Zero) },
+                { new Byte4(Vector4.One * 255), new Byte4(Vector4.Zero * 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.Zero) },
+                { new NormalizedByte2(-Vector2.One), new NormalizedByte2(-Vector2.Zero) },
+                { new NormalizedByte4(Vector4.One), new NormalizedByte4(Vector4.Zero) },
+                { new NormalizedShort2(Vector2.One), new NormalizedShort2(Vector2.Zero) },
+                { new NormalizedShort4(Vector4.One), new NormalizedShort4(Vector4.Zero) },
+                { new Rg32(Vector2.One), new Rg32(Vector2.Zero) },
+                { new Rgba1010102(Vector4.One), new Rgba1010102(Vector4.Zero) },
+                { new Rgba64(Vector4.One), new Rgba64(Vector4.Zero) },
+                { new Short2(Vector2.One * 0x7FFF), new Short2(Vector2.Zero * 0x7FFF) },
+                { new Short4(Vector4.One * 0x7FFF), new Short4(Vector4.Zero * 0x7FFF) },
+
+                // Valid objects of different type
+                { new Alpha8(.5F), new Argb(Vector4.Zero) },
+           };
+
         [Theory]
         [MemberData("EqualityData")]
-        public void EqualsOperator(object first, object second)
+        public void Equality(object first, object second)
         {
             // Act
             var equal = first.Equals(second);
@@ -47,5 +94,15 @@ namespace ImageSharp.Tests.Colors
             Assert.True(equal);
         }
 
+        [Theory]
+        [MemberData("NotEqualityData")]
+        public void NotEquality(object first, object second)
+        {
+            // Act
+            var equal = first.Equals(second);
+
+            // Assert
+            Assert.False(equal);
+        }
     }
 }