How to unit test private members of a class in swift? [duplicate] - ios

Question

This question already has answers here:
Swift - Unit testing private variables and methods
(8 answers)
Closed 1 year ago.
I have a class with few public and private members like below :
public class ReviewManager {
public static let shared = ReviewManager()
private static let startDateKey = "StartDate"
private static let popupLastSeenKey = "LastSeen"
private static let lastVersionPromptedForReview = "lastVersionPromptedForReview"
private(set) var startDate: Date {
get {
Date()
}
set { }
}
private(set) var lastPopupDate: Date? {
get {
}
set {
}
}
private(set) var lastVersionPromptedForReview: String {
get {
}
set {
}
}
private(set) var appCurrentVersion: String {
get {
// Get the current bundle version for the app
guard let currentVersion = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
else {
logError("Expected to find a bundle version in the info dictionary")
return ""
}
return currentVersion
}
set { }
}
private func requestReview() {
SKStoreReviewController.requestReview()
lastPopupDate = Date()
lastVersionPromptedForReview = appCurrentVersion
}
public func requestReviewIfPossible() {
let today = Date()
if lastPopupDate == nil {
if allowedToPresentToday() && allowedToPresentForThisVersion() {
requestReview()
}
} else {
if let lastPopupDate = lastPopupDate {
if allowedToPresentToday() && allowedToPresentForThisVersion() {
requestReview()
}
}
}
}
private func allowedToPresentToday() -> Bool {
let calendar = Calendar(identifier: .gregorian)
let today = Date()
let components = calendar.dateComponents([.weekday], from: today!)
return components.weekday == 5 || components.weekday == 6
}
private func allowedToPresentForThisVersion() -> Bool {
let allowedToShowForThisVersion = (appCurrentVersion != lastVersionPromptedForReview) ? true : false
return allowedToShowForThisVersion
}
}
Now I want to write Unit tests for all the private functions in this class. I can access private properties in this class by making access modifier as
private(set)
But private functions can not be accessed outside the class.
Is there any way to unit test private functions in Swift ?

Answer 1

Completely echo #luk2302, in that you should be testing the public interface. But if you feel you really must, perhaps consider creating a wrapper function around the private function to expose it. You could make this compile conditionally, say in this example only in DEBUG mode, so it doesn't pollute your production code:
class MyClass {
private func myPrivateFunc() -> Void {
print("Hello")
}
}
#if DEBUG
extension MyClass {
func myPublicFunc() -> Void {
myPrivateFunc()
}
}
#endif
let myClass = MyClass()
myClass.myPublicFunc()