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/// Any old user class
class User { … }

/// Response enum to notify us about a success or failure
enum Response {
  case success
  case fail(Error)
}

/// Types that implement this protocol 

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class FollowerViewModelTest: XCTestCase {
  let disposeBag = DisposeBag()
  func testFollowersUpdate() {
    let testFollower = User()
    let mockNetworking = FollowerNetworkingMock(mockFollowers: [testFollower])
    // Create a scheduler that starts at 0
    let scheduler = TestScheduler(initialClock: 0)
    let viewModel = FollowUserViewModel(networkHandler: mockNetworking, scheduler: scheduler)
    let testCountObserver = scheduler.createTestObserver(Int.self)
    let testLatestFollowObserver = scheduler.createTestObserver(User.self)

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class FollowerViewModelTest: XCTestCase {
  // retain subscriptions while testing
  let disposeBag = DisposeBag()
  
  func testFollowersUpdate() {
    let testFollower = User()
    let mockNetworking = FollowerNetworkingMock(
    mockFollowers: [testFollower], 
      followResponse: .success
    )

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final class FollowUserViewModel {
  // same properties as above
  init(
    networkHandler: FollowNetworkHandler, 
    scheduler: SchedulerType // inject a scheduler type to the initializer
  ) {
    followSubject
      .observeOn(scheduler)
      // transformation 
      .disposed(by: disposeBag)

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//
//  FollowUserViewModel.swift
//  YourFavoriteInstruments
//
//  Created by Dean Silfen on 2/2/19.
//  Copyright © 2019 Dean Silfen. All rights reserved.
//

import RxSwift
import RxCocoa

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final class FollowUserViewModel {
  // Observer for our view to bind to when our user
  // wants to follow another user.
  let followUserObserver: AnyObserver<User> {
    return followSubject.asObserver()
  }
  private let disposeBag = DisposeBag()
  // This subject will listen for users to follow.
  private let followSubject = PublishSubject<User>()
  init(user: User, networkHandler: FollowNetworkHandler) {

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//: A UIKit based Playground for presenting user interface
  
import UIKit
import PlaygroundSupport

protocol GreetService {
  func greeting() -> String
}

class Greeter: GreetService{

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//: A UIKit based Playground for presenting user interface
  
import UIKit
import PlaygroundSupport

protocol GreetService {
  func greeting() -> String
}

class Greeter: GreetService{

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struct Dog {
  let name: String 
} 

let possibleDogNames: [String?] = [
  "barry",
  "scooby",
  "scrappy",
  nil,
  nil,

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/*

`map` is a method on sequence that will iterate over a sequence
and apply a closure to each element of that sequence. It will then
return the new sequence with the closure applied.

Using `map` simplifies code that needs to transform lists of data

for example, it could be used here to simplify your code.
*/