fix(ui_oauth_apple): set default scope to 'email' and add a way to provide custom scopes

packages/firebase_ui_auth/example/macos/Podfile

@@ -1,4 +1,4 @@
-platform :osx, '10.12'
+platform :osx, '10.13'
 
 # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
 ENV['COCOAPODS_DISABLE_STATS'] = 'true'

packages/firebase_ui_auth/example/test_driver/apple_sign_in_test.dart

@@ -109,6 +109,18 @@ void main() async {
     },
     skip: !provider.supportsPlatform(defaultTargetPlatform),
   );
+
+  group('AppleProvider', () {
+    test('has default scopes', () {
+      final provider = AppleProvider();
+      expect(provider.firebaseAuthProvider.scopes, ['email']);
+    });
+
+    test('provides a way to pass custom scopes', () {
+      final provider = AppleProvider(scopes: {'email', 'name'});
+      expect(provider.firebaseAuthProvider.scopes, ['email', 'name']);
+    });
+  });
 }
 
 class MockListener<T> extends Mock {
@@ -144,14 +156,16 @@ class MockApp extends Mock implements FirebaseApp {}
 
 class MockAuth extends Mock implements FirebaseAuth {
   @override
-  Future<UserCredential> signInWithAuthProvider(Object provider) async {
+  Future<UserCredential> signInWithProvider(Object provider) async {
     return super.noSuchMethod(
       Invocation.method(#signInWithAuthProvider, [provider]),
-      returnValue: Future.delayed(const Duration(milliseconds: 50))
-          .then((_) => MockCredential()),
+      returnValue: Future.delayed(const Duration(milliseconds: 10)).then(
+        (_) => MockCredential(),
+      ),
       returnValueForMissingStub:
-          Future.delayed(const Duration(milliseconds: 50))
-              .then((_) => MockCredential()),
+          Future.delayed(const Duration(milliseconds: 10)).then(
+        (_) => MockCredential(),
+      ),
     );
   }
 }

packages/firebase_ui_auth/example/test_driver/firebase_ui_auth_e2e.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 
@@ -36,8 +37,10 @@ Future<void> main() async {
     phone_verification.main();
     google_sign_in.main();
     twitter_sign_in.main();
-    apple_sign_in.main();
     facebook_sign_in.main();
+    apple_sign_in.main();
+  } else if (defaultTargetPlatform == TargetPlatform.macOS) {
+    apple_sign_in.main();
   }
 
   layout.main();

packages/firebase_ui_oauth_apple/lib/src/provider.dart

@@ -11,9 +11,21 @@ class AppleProvider extends OAuthProvider {
   @override
   final style = const AppleProviderButtonStyle();
 
+  /// {@template ui.auth.oauth.apple_provider.scopes}
+  /// The scopes that will be passed down to the [fba.AppleAuthProvider].
+  /// {@endtemplate}
+  final Set<String> scopes;
+
   @override
   fba.AppleAuthProvider firebaseAuthProvider = fba.AppleAuthProvider();
 
+  AppleProvider({
+    /// {@macro ui.auth.oauth.apple_provider.scopes}
+    this.scopes = const <String>{'email'},
+  }) {
+    scopes.forEach(firebaseAuthProvider.addScope);
+  }
+
   @override
   void mobileSignIn(AuthAction action) {
     authListener.onBeforeSignIn();