Fix analyzer failures + reformat

Author: collinjackson

packages/firebase_auth/example/test/firebase_auth.dart

@@ -83,7 +83,8 @@ void main() {
         password: testPassword,
       );
       expect(result.user.uid, equals(user.uid));
-      List<String> methods = await auth.fetchSignInMethodsForEmail(email: testEmail);
+      final List<String> methods =
+          await auth.fetchSignInMethodsForEmail(email: testEmail);
       expect(methods.length, 1);
       expect(methods[0], 'password');
       await user.delete();
@@ -102,8 +103,9 @@ void main() {
     });
 
     test('fetchSignInMethodsForEmail nonexistent user', () async {
-      String testEmail = 'testuser${Uuid().v4()}@example.com';
-      List<String> methods = await auth.fetchSignInMethodsForEmail(email: testEmail);
+      final String testEmail = 'testuser${Uuid().v4()}@example.com';
+      final List<String> methods =
+          await auth.fetchSignInMethodsForEmail(email: testEmail);
       expect(methods, isNotNull);
       expect(methods.length, 0);
     });