test: added firebase authentication test

SE491GroupProject/Services/FirebaseProtocols.swift

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+// FirebaseProtocols.swift
+import Firebase
+import FirebaseFirestoreSwift
+
+protocol FirebaseAuthenticating {
+    func signIn(withEmail email: String, password: String) async throws -> FirebaseAuth.User
+    func createUser(withEmail email: String, password: String) async throws -> FirebaseAuth.User
+    func signOut() throws
+    func sendPasswordReset(withEmail email: String, completion: @escaping (Error?) -> Void)
+    func delete(user: FirebaseAuth.User, completion: @escaping (Error?) -> Void)
+}
+
+protocol FirestoreHandling {
+    func setData(for user: User, in collection: String) async throws
+    func fetchUser(uid: String, from collection: String) async throws -> User?
+}

SE491GroupProject/Services/FirebaseServicesExtensions.swift

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+// FirebaseServicesExtensions.swift
+import Firebase
+
+extension Auth: FirebaseAuthenticating {
+    func signIn(withEmail email: String, password: String) async throws -> FirebaseAuth.User {
+        let result = try await signIn(withEmail: email, password: password)
+        return result.user
+    }
+
+    func createUser(withEmail email: String, password: String) async throws -> FirebaseAuth.User {
+        let result = try await createUser(withEmail: email, password: password)
+        return result.user
+    }
+
+    func delete(user: FirebaseAuth.User, completion: @escaping (Error?) -> Void) {
+        user.delete(completion: completion)
+    }
+}
+
+extension Firestore: FirestoreHandling {
+    func setData(for user: User, in collection: String) async throws {
+        let encodedUser = try Firestore.Encoder().encode(user)
+        let _ = try await collection(collection).document(user.id).setData(encodedUser)
+    }
+
+    func fetchUser(uid: String, from collection: String) async throws -> User? {
+        let snapshot = try await collection(collection).document(uid).getDocument()
+        return try snapshot.data(as: User.self)
+    }
+}

SE491GroupProjectTests/AuthViewModelTests.swift

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+import XCTest
+@testable import SE491GroupProject
+
+final class AuthViewModelTests: XCTestCase {
+    private var viewModel: AuthViewModel!
+    private var mockAuth: MockAuth!
+
+    override func setUp() {
+        super.setUp()
+        mockAuth = MockAuth()
+        viewModel = AuthViewModel(auth: mockAuth)
+    }
+
+    func testSignInSuccess() async {
+        mockAuth.mockedUser = FirebaseAuth.User(uid: "LEcivUowvvYab8mE8e3s5sXJbPR2", email: "admin@gmail.com")  // Assuming FirebaseAuth.User has this initializer
+        do {
+            let user = try await viewModel.signIn(withEmail: "admin@gmail.com", password: "123456789")
+            XCTAssertEqual(user.email, "admin@gmail.com")
+        } catch {
+            XCTFail("SignIn should succeed")
+        }
+    }
+}

SE491GroupProjectTests/MockFirebaseAuth.swift

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+// MockFirebaseAuth.swift
+import Firebase
+
+class MockAuth: FirebaseAuthenticating {
+    var shouldReturnError = false
+    var mockedUser: FirebaseAuth.User?
+
+    func signIn(withEmail email: String, password: String) async throws -> FirebaseAuth.User {
+        if let user = mockedUser, !shouldReturnError {
+            return user
+        } else {
+            throw NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock: Failed to sign in"])
+        }
+    }
+
+    func createUser(withEmail email: String, password: String) async throws -> FirebaseAuth.User {
+        if let user = mockedUser, !shouldReturnError {
+            return user
+        } else {
+            throw NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock: Failed to create user"])
+        }
+    }
+
+    func signOut() throws {
+        if shouldReturnError {
+            throw NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock: Failed to sign out"])
+        }
+    }
+
+    func sendPasswordReset(withEmail email: String, completion: @escaping (Error?) -> Void) {
+        if shouldReturnError {
+            completion(NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock: Failed to send password reset email"]))
+        } else {
+            completion(nil)
+        }
+    }
+
+    func delete(user: FirebaseAuth.User, completion: @escaping (Error?) -> Void) {
+        if shouldReturnError {
+            completion(NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock: Failed to delete user"]))
+        } else {
+            completion(nil)
+        }
+    }
+}