Test the Discord.Color structure (#786)

This provides tests to ensure the following:
- Creating a Color
- Creating a Default Color
- Accessing a Color's Raw Value
- Accessing a Color's translated RGB values

test/Discord.Net.Tests/Tests.Colors.cs

@@ -0,0 +1,86 @@
+using System;
+using Xunit;
+
+namespace Discord
+{
+    public class ColorTests
+    {
+        [Fact]
+        public void Color_New()
+        {
+            Assert.Equal(0u, new Color().RawValue);
+            Assert.Equal(uint.MinValue, new Color(uint.MinValue).RawValue);
+            Assert.Equal(uint.MaxValue, new Color(uint.MaxValue).RawValue);
+        }
+        public void Color_Default()
+        {
+            Assert.Equal(0u, Color.Default.RawValue);
+            Assert.Equal(0, Color.Default.R);
+            Assert.Equal(0, Color.Default.G);
+            Assert.Equal(0, Color.Default.B);
+        }
+        [Fact]
+        public void Color_FromRgb_Byte()
+        {
+            Assert.Equal(0xFF0000u, new Color((byte)255, (byte)0, (byte)0).RawValue);
+            Assert.Equal(0x00FF00u, new Color((byte)0, (byte)255, (byte)0).RawValue);
+            Assert.Equal(0x0000FFu, new Color((byte)0, (byte)0, (byte)255).RawValue);
+            Assert.Equal(0xFFFFFFu, new Color((byte)255, (byte)255, (byte)255).RawValue);
+        }
+        [Fact]
+        public void Color_FromRgb_Int()
+        {
+            Assert.Equal(0xFF0000u, new Color(255, 0, 0).RawValue);
+            Assert.Equal(0x00FF00u, new Color(0, 255, 0).RawValue);
+            Assert.Equal(0x0000FFu, new Color(0, 0, 255).RawValue);
+            Assert.Equal(0xFFFFFFu, new Color(255, 255, 255).RawValue);
+        }
+        [Fact]
+        public void Color_FromRgb_Int_OutOfRange()
+        {
+            Assert.Throws<ArgumentOutOfRangeException>("r", () => new Color(-1024, 0, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("r", () => new Color(1024, 0, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("g", () => new Color(0, -1024, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("g", () => new Color(0, 1024, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("b", () => new Color(0, 0, -1024));
+            Assert.Throws<ArgumentOutOfRangeException>("b", () => new Color(0, 0, 1024));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new Color(-1024, -1024, -1024));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new Color(1024, 1024, 1024));
+        }
+        [Fact]
+        public void Color_FromRgb_Float()
+        {
+            Assert.Equal(0xFF0000u, new Color(1.0f, 0, 0).RawValue);
+            Assert.Equal(0x00FF00u, new Color(0, 1.0f, 0).RawValue);
+            Assert.Equal(0x0000FFu, new Color(0, 0, 1.0f).RawValue);
+            Assert.Equal(0xFFFFFFu, new Color(1.0f, 1.0f, 1.0f).RawValue);
+        }
+        [Fact]
+        public void Color_FromRgb_Float_OutOfRange()
+        {
+            Assert.Throws<ArgumentOutOfRangeException>("r", () => new Color(-2.0f, 0, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("r", () => new Color(2.0f, 0, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("g", () => new Color(0, -2.0f, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("g", () => new Color(0, 2.0f, 0));
+            Assert.Throws<ArgumentOutOfRangeException>("b", () => new Color(0, 0, -2.0f));
+            Assert.Throws<ArgumentOutOfRangeException>("b", () => new Color(0, 0, 2.0f));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new Color(-2.0f, -2.0f, -2.0f));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new Color(2.0f, 2.0f, 2.0f));
+        }
+        [Fact]
+        public void Color_Red()
+        {
+            Assert.Equal(0xAF, new Color(0xAF1390).R);
+        }
+        [Fact]
+        public void Color_Green()
+        {
+            Assert.Equal(0x13, new Color(0xAF1390).G);
+        }
+        [Fact]
+        public void Color_Blue()
+        {
+            Assert.Equal(0x90, new Color(0xAF1390).B);
+        }
+    }
+}