Initial implementation for AppLockSetupFlowCoordinator. (#1949)

Rename AppLockSettingsScreen to AppLockSetupSettingsScreen.
Implement forced logout and persist PIN entry attempts.

UnitTests/Sources/AppLock/AppLockScreenViewModelTests.swift

@@ -20,6 +20,7 @@ import XCTest
 
 @MainActor
 class AppLockScreenViewModelTests: XCTestCase {
+    var appSettings: AppSettings!
     var appLockService: AppLockService!
     var keychainController: KeychainControllerMock!
     var viewModel: AppLockScreenViewModelProtocol!
@@ -28,8 +29,9 @@ class AppLockScreenViewModelTests: XCTestCase {
     
     override func setUp() {
         AppSettings.reset()
+        appSettings = AppSettings()
         keychainController = KeychainControllerMock()
-        appLockService = AppLockService(keychainController: keychainController, appSettings: AppSettings())
+        appLockService = AppLockService(keychainController: keychainController, appSettings: appSettings)
         viewModel = AppLockScreenViewModel(appLockService: appLockService)
     }
     
@@ -51,4 +53,60 @@ class AppLockScreenViewModelTests: XCTestCase {
         // The app should become unlocked.
         XCTAssertEqual(result, .appUnlocked)
     }
+    
+    func testForgotPIN() {
+        // Given a fresh launch of the app.
+        XCTAssertNil(context.alertInfo, "No alert should be shown initially.")
+        
+        // When the user has forgotten their PIN.
+        context.send(viewAction: .forgotPIN)
+        
+        // Then an alert should be shown before logging out.
+        XCTAssertEqual(context.alertInfo?.id, .confirmResetPIN, "An alert should be shown before logging out.")
+    }
+    
+    func testUnlockFailure() async throws {
+        // Given an invalid PIN code.
+        let pinCode = "2024"
+        keychainController.pinCodeReturnValue = "2023"
+        XCTAssertEqual(context.viewState.numberOfPINAttempts, 0, "The shouldn't be any attempts yet.")
+        XCTAssertFalse(context.viewState.isSubtitleWarning, "No warning should be shown yet.")
+        XCTAssertNil(context.alertInfo, "No alert should be shown yet.")
+        
+        // When entering it on the lock screen.
+        viewModel.context.pinCode = pinCode
+        context.send(viewAction: .submitPINCode)
+        
+        // Then a failed attempt should be shown.
+        XCTAssertEqual(context.viewState.numberOfPINAttempts, 1, "A failed attempt should have been recorded.")
+        XCTAssertTrue(context.viewState.isSubtitleWarning, "A warning should now be shown.")
+        XCTAssertNil(context.alertInfo, "No alert should be shown yet.")
+        
+        // When entering twice more
+        context.send(viewAction: .submitPINCode)
+        context.send(viewAction: .submitPINCode)
+        
+        // Then an alert should be shown
+        XCTAssertEqual(context.viewState.numberOfPINAttempts, 3, "All the attempts should have been recorded.")
+        XCTAssertTrue(context.viewState.isSubtitleWarning, "The warning should still be shown.")
+        XCTAssertEqual(context.alertInfo?.id, .forcedLogout, "An alert should now be shown.")
+    }
+    
+    func testForceQuitRequiresLogout() {
+        // Given an app with a PIN set where the user attempted to unlock 3 times.
+        keychainController.pinCodeReturnValue = "2023"
+        appSettings.appLockNumberOfPINAttempts = 2
+        XCTAssertNil(context.alertInfo)
+        viewModel.context.pinCode = "0000"
+        context.send(viewAction: .submitPINCode)
+        XCTAssertEqual(appSettings.appLockNumberOfPINAttempts, 3, "The app should have 3 failed attempts before the force quit.")
+        XCTAssertEqual(context.alertInfo?.id, .forcedLogout, "The app should be showing the alert before the force quit.")
+        
+        // When force quitting the app and relaunching.
+        viewModel = nil
+        let freshViewModel = AppLockScreenViewModel(appLockService: appLockService)
+        
+        // Then the alert should remain in place
+        XCTAssertEqual(freshViewModel.context.alertInfo?.id, .forcedLogout, "The new view model from the fresh launch should also show the alert")
+    }
 }