[google_sign_in] Fix tests to recognize new request attribute. (flutter#5702)

Author: ditman

packages/google_sign_in/google_sign_in/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Fixes tests to recognize new default `forceCodeForRefreshToken` request attribute.
+
 ## 5.3.1
 
 * Fixes library_private_types_in_public_api, sort_child_properties_last and use_key_in_widget_constructors

packages/google_sign_in/google_sign_in/test/google_sign_in_test.dart

@@ -96,6 +96,7 @@ void main() {
             'scopes': <String>[],
             'hostedDomain': null,
             'clientId': fakeClientId,
+            'forceCodeForRefreshToken': false,
           }),
           isMethodCall('signIn', arguments: null),
         ],
@@ -431,5 +432,6 @@ Matcher _isSignInMethodCall({String signInOption = 'SignInOption.standard'}) {
     'scopes': <String>[],
     'hostedDomain': null,
     'clientId': null,
+    'forceCodeForRefreshToken': false,
   });
 }