public void CSSColorParseConstTest()
{
var color = CSSColor.ParseConstant("black");
color.Should().NotBeNull();
color.A.Should().BeGreaterOrEqualTo(255);
color.R.Should().BeGreaterOrEqualTo(0);
color.G.Should().BeGreaterOrEqualTo(0);
color.B.Should().BeGreaterOrEqualTo(0);
}