iOS UI Test Does Not Recognize Items in NSUserDefaults - ios

Question

I am writing a demo app where I store items in NSUserDefaults. The iOS UI Test looks like this:
func test_should_create_account_successfully() {
app.textFields["usernameTextField"].tapAndType(text: "johndoe")
app.textFields["passwordTextField"].tapAndType(text: "password")
app.buttons["registerButton"].tap()
let users = dataAccess.getUsers()
XCTAssertTrue(users.count > 0)
}
The registerButton tap fired the following code:
#IBAction func saveButtonClicked() {
let user = User(username: self.usernameTextField.text!, password: self.passwordTextField.text!)
self.dataAccess.saveUser(user)
}
DataAccess class is defined below:
func saveUser(_ user:User) {
user.userId = UUID().uuidString
var users = getUsers()
users.append(user)
let usersData = NSKeyedArchiver.archivedData(withRootObject: users)
// save the user
let userDefaults = UserDefaults.standard
userDefaults.setValue(usersData, forKey: "users")
userDefaults.synchronize()
}
func getUsers() -> [User] {
let userDefaults = UserDefaults.standard
let usersData = userDefaults.value(forKey: "users") as? Data
if usersData == nil {
return [User]()
}
let users = NSKeyedUnarchiver.unarchiveObject(with: usersData!) as! [User]
return users
}
The problem is that the following line always return 0 users:
let users = dataAccess.getUsers()
This only happens in iOS UI Test and not in normal Unit Test target.
UPDATE: User class is NSCoding Protocol compatible
public class User : NSObject, NSCoding {
var username :String!
var password :String!
var userId :String!
init(username :String, password :String) {
self.username = username
self.password = password
}
public func encode(with aCoder: NSCoder) {
aCoder.encode(self.userId,forKey: "userId")
aCoder.encode(self.username, forKey: "username")
aCoder.encode(self.password, forKey: "password")
}
public required init?(coder aDecoder: NSCoder) {
self.userId = aDecoder.decodeObject(forKey: "userId") as! String
self.username = aDecoder.decodeObject(forKey: "username") as! String
self.password = aDecoder.decodeObject(forKey: "password") as! String
}
}

Answer 1

It is because your class User is not properly encoded do it like this sample class (in swift 3):
class User: NSObject, NSCoding {
let name : String
let url : String
let desc : String
init(tuple : (String,String,String)){
self.name = tuple.0
self.url = tuple.1
self.desc = tuple.2
}
func getName() -> String {
return name
}
func getURL() -> String{
return url
}
func getDescription() -> String {
return desc
}
func getTuple() -> (String, String, String) {
return (self.name,self.url,self.desc)
}
required init(coder aDecoder: NSCoder) {
self.name = aDecoder.decodeObject(forKey: "name") as? String ?? ""
self.url = aDecoder.decodeObject(forKey: "url") as? String ?? ""
self.desc = aDecoder.decodeObject(forKey: "desc") as? String ?? ""
}
func encode(with aCoder: NSCoder) {
aCoder.encode(self.name, forKey: "name")
aCoder.encode(self.url, forKey: "url")
aCoder.encode(self.desc, forKey: "desc")
}
}
then save and get it from UserDefaults like this:
func save() {
let data = NSKeyedArchiver.archivedData(withRootObject: object)
UserDefaults.standard.set(data, forKey:"userData" )
}
func get() -> MyObject? {
guard let data = UserDefaults.standard.object(forKey: "userData") as? Data else { return nil }
return NSKeyedUnarchiver.unarchiveObject(with: data) as? MyObject
}