gui-cs.Terminal.Gui/UnitTests/Drawing/ColorTests.cs

#nullable enable

namespace Terminal.Gui.DrawingTests;

public partial class ColorTests {

	[Theory]
	[CombinatorialData]
	public void Argb_Returns_Expected_Value ([CombinatorialValues (0, 255)] byte a, [CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 153, 51)] byte g, [CombinatorialRange (0, 128, 32)] byte b)
	{
		Color color = new (r, g, b, a);
		// Color.Rgba is expected to be a signed int32 in little endian order (a,b,g,r)
		ReadOnlySpan<byte> littleEndianBytes = [b, g, r, a];
		uint expectedArgb = BitConverter.ToUInt32 (littleEndianBytes);
		Assert.Equal (expectedArgb, color.Argb);
	}

	[Fact]
	public void Color_ColorName_Get_ReturnsClosestColorName ()
	{
		// Arrange
		var color = new Color (128, 64, 40); // Custom RGB color, closest to Yellow
		var expectedColorName = ColorName.Yellow;

		// Act
		var colorName = color.GetClosestNamedColor ();

		// Assert
		Assert.Equal (expectedColorName, colorName);
	}
	[Fact]
	public void Color_IsClosestToNamedColor_ReturnsExpectedValue ()
	{
		// Arrange
		var color1 = new Color (ColorName.Red);
		var color2 = new Color (197, 15, 31); // Red in RGB

		Assert.True (color1.IsClosestToNamedColor (ColorName.Red));

		Assert.True (color2.IsClosestToNamedColor (ColorName.Red));
	}

	[Theory]
	[MemberData (nameof (ColorTestsTheoryDataGenerators.FindClosestColor_ReturnsClosestColor), MemberType = typeof (ColorTestsTheoryDataGenerators))]
	public void FindClosestColor_ReturnsClosestColor (Color inputColor, ColorName expectedColorName)
	{
		var actualColorName = Color.GetClosestNamedColor (inputColor);

		Assert.Equal (expectedColorName, actualColorName);
	}


	[Theory]
	[CombinatorialData]
	public void Rgba_Returns_Expected_Value ([CombinatorialValues (0, 255)] byte a, [CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 153, 51)] byte g, [CombinatorialRange (0, 128, 32)] byte b)
	{
		Color color = new (r, g, b, a);
		// Color.Rgba is expected to be a signed int32 in little endian order (a,b,g,r)
		ReadOnlySpan<byte> littleEndianBytes = [b, g, r, a];
		int expectedRgba = BitConverter.ToInt32 (littleEndianBytes);
		Assert.Equal (expectedRgba, color.Rgba);
	}
}
public static partial class ColorTestsTheoryDataGenerators {

	public static TheoryData<Color, ColorName> FindClosestColor_ReturnsClosestColor ()
	{
		TheoryData<Color, ColorName> data = [];
		data.Add (new Color (0, 0), ColorName.Black);
		data.Add (new Color (255, 255, 255), ColorName.White);
		data.Add (new Color (5, 100, 255), ColorName.BrightBlue);
		data.Add (new Color (0, 255), ColorName.BrightGreen);
		data.Add (new Color (255, 70, 8), ColorName.BrightRed);
		data.Add (new Color (0, 128, 128), ColorName.Cyan);
		data.Add (new Color (128, 64, 32), ColorName.Yellow);
		return data;
	}
}