Test color to hue conversion

1 files changed, 74 insertions, 0 deletions

diff --git a/Xamarin.PropertyEditing.Tests/CommonColorTests.cs b/Xamarin.PropertyEditing.Tests/CommonColorTests.cs
new file mode 100644
index 0000000..84c683f
--- /dev/null
+++ b/Xamarin.PropertyEditing.Tests/CommonColorTests.cs
@@ -0,0 +1,74 @@
+using System.Collections;
+using NUnit.Framework;
+using Xamarin.PropertyEditing.Drawing;
+
+namespace Xamarin.PropertyEditing.Tests
+{
+	public class CommonColorTests
+	{
+		[Test, TestCaseSource (typeof(CommonColorTests), "HuesFromColors")]
+		public CommonColor HueFromColor (CommonColor color) => color.ToHue ();
+
+		private static IEnumerable HuesFromColors() {
+			// Shades of grey all map to red
+			yield return new TestCaseData (new CommonColor (0, 0, 0)).Returns (new CommonColor (255, 0, 0))
+				.SetName ("HueFromColorBlackHasRedHue");
+			yield return new TestCaseData (new CommonColor (255, 255, 255)).Returns (new CommonColor (255, 0, 0))
+				.SetName ("HueFromColorWhiteHasRedHue");
+			yield return new TestCaseData (new CommonColor (127, 127, 127)).Returns (new CommonColor (255, 0, 0))
+				.SetName ("HueFromColorGreyHasRedHue");
+			// Fully-saturated primary colors map to themselves
+			yield return new TestCaseData (new CommonColor (255, 0, 0)).Returns (new CommonColor (255, 0, 0))
+				.SetName ("HueFromColorRedHueHasRedHue");
+			yield return new TestCaseData (new CommonColor (0, 255, 0)).Returns (new CommonColor (0, 255, 0))
+				.SetName ("HueFromColorGreenHueHasGreenHue");
+			yield return new TestCaseData (new CommonColor (0, 0, 255)).Returns (new CommonColor (0, 0, 255))
+				.SetName ("HueFromColorBlueHueHasBlueHue");
+			yield return new TestCaseData (new CommonColor (255, 255, 0)).Returns (new CommonColor (255, 255, 0))
+				.SetName ("HueFromColorYellowHueHasYellowHue");
+			yield return new TestCaseData (new CommonColor (255, 0, 255)).Returns (new CommonColor (255, 0, 255))
+				.SetName ("HueFromColorPurpleHueHasPurpleHue");
+			yield return new TestCaseData (new CommonColor (0, 255, 255)).Returns (new CommonColor (0, 255, 255))
+				.SetName ("HueFromColorCyanHueHasCyanHue");
+			// Darker shades of primary colors map to the fully-saturated shade
+			yield return new TestCaseData (new CommonColor (127, 0, 0)).Returns (new CommonColor (255, 0, 0))
+				.SetName ("HueFromColorDarkRedHasRedHue");
+			yield return new TestCaseData (new CommonColor (0, 127, 0)).Returns (new CommonColor (0, 255, 0))
+				.SetName ("HueFromColorDarkGreenHasGreenHue");
+			yield return new TestCaseData (new CommonColor (0, 0, 127)).Returns (new CommonColor (0, 0, 255))
+				.SetName ("HueFromColorDarkBlueHasBlueHue");
+			yield return new TestCaseData (new CommonColor (127, 127, 0)).Returns (new CommonColor (255, 255, 0))
+				.SetName ("HueFromColorDarkYellowHasYellowHue");
+			yield return new TestCaseData (new CommonColor (127, 0, 127)).Returns (new CommonColor (255, 0, 255))
+				.SetName ("HueFromColorDarkPurpleHasPurpleHue");
+			yield return new TestCaseData (new CommonColor (0, 127, 127)).Returns (new CommonColor (0, 255, 255))
+				.SetName ("HueFromColorDarkCyanHasCyanHue");
+			// Saturated shades of non-primary colors map to themselves
+			yield return new TestCaseData (new CommonColor (255, 142, 0)).Returns (new CommonColor (255, 142, 0))
+				.SetName ("HueFromColorOrangeHueHasOrangeHue");
+			yield return new TestCaseData (new CommonColor (255, 0, 142)).Returns (new CommonColor (255, 0, 142))
+				.SetName ("HueFromColorPinkHueHasPinkHue");
+			yield return new TestCaseData (new CommonColor (142, 255, 0)).Returns (new CommonColor (142, 255, 0))
+				.SetName ("HueFromColorYellowishGreenHueHasYellowishGreenHue");
+			yield return new TestCaseData (new CommonColor (0, 255, 142)).Returns (new CommonColor (0, 255, 142))
+				.SetName ("HueFromColorBlueishGreenHueHasBlueishGreenHue");
+			yield return new TestCaseData (new CommonColor (142, 0, 255)).Returns (new CommonColor (142, 0, 255))
+				.SetName ("HueFromColorDeepPurpleHueHasDeepPurpleHue");
+			yield return new TestCaseData (new CommonColor (0, 142, 255)).Returns (new CommonColor (0, 142, 255))
+				.SetName ("HueFromColorBoringBlueHueHasBoringBlueHue");
+			// More random colors (and also check alpha is 255)
+			yield return new TestCaseData (new CommonColor (42, 142, 194, 78)).Returns (new CommonColor (0, 167, 255, 255))
+				.SetName ("HueFromColorPetroleumBlueHasSaturatedBlueHue");
+			yield return new TestCaseData (new CommonColor (142, 42, 194)).Returns (new CommonColor (167, 0, 255))
+				.SetName ("HueFromColorUglyPurpleHasSaturatedUglyPurpleHue");
+			yield return new TestCaseData (new CommonColor (142, 194, 42)).Returns (new CommonColor (167, 255, 0))
+				.SetName ("HueFromColorKhakiHasSaturatedGreenHue");
+			yield return new TestCaseData (new CommonColor (42, 194, 142)).Returns (new CommonColor (0, 255, 167))
+				.SetName ("HueFromColorDullGreenHasSaturatedGreenHue");
+			yield return new TestCaseData (new CommonColor (194, 42, 142)).Returns (new CommonColor (255, 0, 167))
+				.SetName ("HueFromColorPetroleumBlueHasSaturatedBlueHue");
+			yield return new TestCaseData (new CommonColor (194, 142, 42)).Returns (new CommonColor (255, 167, 0))
+				.SetName ("HueFromDullBrownHasOrangeHue");
+		}
+	}
+}