akshitzaveri

// Checking if unit tests are running
if ProcessInfo.processInfo.environment["unit_tests"] == "true" {
  print("Setting up Firebase emulator localhost:8080")
  let settings = Firestore.firestore().settings
  settings.host = "localhost:8080"
  settings.isPersistenceEnabled = false
  settings.isSSLEnabled = false
  Firestore.firestore().settings = settings
}

akshitzaveri

init?(from document: [String: Any]) {
  guard let idString = document["id"] as? String,
    let id = Int(idString),
    let name = document["name"] as? String,
    let priceString = document["pricePerUnit"] as? String,
    let price = Double(priceString) else { return nil }

  self.init(id: id, name: name, pricePerUnit: price)
}

akshitzaveri

typealias GetProductsCompletionHandler = ([Product]) -> Void

func getProductsFromCart(_ completion: @escaping GetProductsCompletionHandler) {
  self.db.collection("cart").getDocuments { (snapshot, error) in

    // Handle error
    if error != nil {
      completion([])
      return
    }

akshitzaveri

func test_WhenProductIsNotNilAndAddToCartIsCalled_ThenTheProductIsAdded() {
  // given
  self.viewModel.product = Product(id: 1, name: "Grey T-Shirt", pricePerUnit: 20)
  let exp = self.expectation(description: "Waiting for async operation")

  // when
  self.viewModel.addToCart { (result) in
    // then
    switch result {
    case .success:

akshitzaveri

import XCTest
import Firebase

extension XCTestCase {

  func clearFirestore() {
    let semaphore = DispatchSemaphore(value: 0)
    let projectId = FirebaseApp.app()!.options.projectID!
    let url = URL(string: "http://localhost:8080/emulator/v1/projects/\(projectId)/databases/(default)/documents")!
    var request = URLRequest(url: url)

akshitzaveri

override func tearDownWithError() throws {
  self.viewModel = nil
  self.clearFirestore()
}

akshitzaveri

self.stackView.setCustomSpacing(32, after: self.secondLabel)

akshitzaveri

import Foundation

protocol Animal {
  func walk()
  func run()
}

class Elephant: Animal {
  func walk() {
    print("I am walking")

akshitzaveri

import Foundation

@objc protocol Animal {
  func walk()
  @objc optional func run()
}

class Elephant: NSObject, Animal {
  func walk() {
    print("I am walking")

akshitzaveri

import Foundation

protocol Animal {
  func walk()
  func run()
}

extension Animal {
  func run() {
  }