login test [nfc]: Pull out an attempt helper in AddAccountPage test

Author: chrisbobbe

test/widgets/login_test.dart

@@ -98,20 +98,24 @@ void main() {
       await testNavObserver.pumpPastTransition(tester);
     }
 
-    testWidgets('happy path', (tester) async {
-      await prepare(tester);
-
-      final serverSettings = eg.serverSettings();
-
-      await tester.enterText(find.byType(TextField),
-        serverSettings.realmUrl.toString());
+    Future<void> attempt(WidgetTester tester,
+        Uri realmUrl, Map<String, Object?> responseJson) async {
+      await tester.enterText(find.byType(TextField), realmUrl.toString());
       testBinding.globalStore.useCachedApiConnections = true;
       connection = testBinding.globalStore.apiConnection(
-        realmUrl: serverSettings.realmUrl,
+        realmUrl: realmUrl,
         zulipFeatureLevel: null);
-      connection.prepare(json: serverSettings.toJson());
+      connection.prepare(json: responseJson);
       await tester.tap(find.text('Continue'));
       await tester.pump(Duration.zero);
+    }
+
+    testWidgets('happy path', (tester) async {
+      await prepare(tester);
+
+      final serverSettings = eg.serverSettings();
+
+      await attempt(tester, serverSettings.realmUrl, serverSettings.toJson());
       checkNoDialog(tester);
       check(takePushedRoutes()).single.isA<WidgetRoute>().page.isA<LoginPage>()
         .serverSettings.realmUrl.equals(serverSettings.realmUrl);