import Randomizable

// conform Decodable to auto-implement Randomizable
struct User: Decodable, Randomizable {
    let id: ID
    let name: String

    struct ID: Decodable, Randomizable {
        let id: Int
    }
}

let user = User.randomValue()
// => User(id: ID(id: 1823), name: "raewfbaw")

struct User: Decodable, Randomizable {
    let name: String
    let profile: Profile

    struct Profile: Decodable, Randomizable {
        let email: String
        let birthday: Date?

        static func randomValue() -> Profile {
            return Profile(email: "\(String.randomValue())@test.com",
                           birthday: Date?.randomValue())
        }
    }
}

let user = User.randomValue()
// => User(name: "gaoaweja", profile: Profile(email: "iwelasm@test.com"
//                           birthday: 2018-11-02 16:25:17 +0000))

struct A: Decodable, Randomizable {
    let animal: Animal
    enum Animal: String, Decodable, CaseIterable, Randomizable {
        case cat
        case dog
        case rabbit
    }
}

A.randomValue()
// => A(animal: Animal.cat)