ExampleOfProtocols.swift

class RGBRandomColor: RGBColorProtocol {
    var red: Double = Constants.random
    var green: Double = Constants.random
    var blue: Double = Constants.random
}

class RGBUserColor: RGBColorProtocol {
    static let initial: Double = 188/255

    var red: Double = RGBInitialColor.initial
    var green: Double = RGBInitialColor.initial
    var blue: Double = RGBInitialColor.initial
}

class RGBTestStartColor: RGBColorProtocol {
    var red: Double = 19/255
    var green: Double = 84/255
    var blue: Double = 122/255
}

class RGBTestEndColor: RGBColorProtocol {
    var red: Double = 128/255
    var green: Double = 208/255
    var blue: Double = 199/255
}

struct Constants {
    static var random: Double {
        Double.random(in: 0...1)
    }
}

class RGBRandomGradient: GradientProtocol {
    var startColor: ColorProtocol = RGBRandomColor()
    var endColor: ColorProtocol = RGBRandomColor()
}

class RGBUserGradient: GradientProtocol {
    var startColor: ColorProtocol = RGBUserColor()
    var endColor: ColorProtocol = RGBUserColor()
}

class RGBTestGradient: GradientProtocol {
    var startColor: ColorProtocol = RGBTestStartColor()
    var endColor: ColorProtocol = RGBTestEndColor()
}