kotlin_testing_pt3_example

kotlin_testing_pt3_example.kt

class User(
        private val firstName: String,
        private val lastName: String,
        private val age: Int) {

    val fullName = "$firstName $lastName"

    val canDrink = (age >= 18)

    val friends: MutableList<User> = mutableListOf()

    fun addFriend(user: User) {
       if (user !in friends) {
            friends.add(user)

            user.addFriend(this)
        }
    }
}