Test a bad case when we get duplicates of choose-account route

Signed-off-by: Zixuan James Li <[email protected]>

test/widgets/store_test.dart

@@ -123,6 +123,50 @@ void main() {
       .contains('consider MaterialAccountWidgetRoute');
   });
 
+  testWidgets('PerAccountStoreWidget when log out, no duplicate choose-account page', (tester) async {
+    Route<void>? newRoute, oldRoute;
+    final testNavObserver = TestNavigatorObserver()
+      ..onReplaced = (route, prevRoute) {
+        assert(newRoute == null && oldRoute == null);
+        newRoute = route!;
+        oldRoute = prevRoute!;
+      };
+    // A route to remove is a root level home route
+    const loadPerAccountDuration = Duration(seconds: 30);
+    assert(loadPerAccountDuration > kTryAnotherAccountWaitPeriod);
+    testBinding.globalStore.loadPerAccountDuration = loadPerAccountDuration;
+    testBinding.globalStore.loadPerAccountException = ZulipApiException(
+      routeName: '/register', code: 'INVALID_API_KEY', httpStatus: 400,
+      data: {}, message: '');
+    await testBinding.globalStore.insertAccount(eg.selfAccount.toCompanion(false));
+    await tester.pumpWidget(ZulipApp(navigatorObservers: [testNavObserver]));
+    await tester.pump(); // start to load account
+
+    final pushedRoutes = <Route<void>>[];
+    final removedRoutes = <Route<void>>[];
+    testNavObserver.onPushed = (route, prevRoute) => pushedRoutes.add(route);
+    testNavObserver.onRemoved = (route, prevRoute) => removedRoutes.add(route);
+    await tester.pump(kTryAnotherAccountWaitPeriod);
+    await tester.tap(find.text('Try another account'));
+    await tester.pump(); // tap the button
+    check(pushedRoutes).single.isA<WidgetRoute>().page.isA<ChooseAccountPage>();
+    pushedRoutes.clear();
+
+    await tester.pump(loadPerAccountDuration); // got the error
+    await tester.pump(TestGlobalStore.removeAccountDuration);
+
+    checkErrorDialog(tester,
+      expectedTitle: 'Could not connect',
+      expectedMessage:
+        'Your account at https://chat.example/ could not be authenticated.'
+        ' Please try logging in again or use another account.');
+    // Ended up with two choose-account page routes on the stack, not good.
+    check(newRoute).isA<WidgetRoute>().page.isA<ChooseAccountPage>();
+    check(oldRoute).isA<WidgetRoute>().page.isA<HomePage>();
+    check(testBinding.globalStore.takeDoRemoveAccountCalls())
+      .single.equals(eg.selfAccount.id);
+  });
+
   testWidgets('PerAccountStoreWidget when log out, replace root level route', (tester) async {
     Route<void>? newRoute, oldRoute;
     final testNavObserver = TestNavigatorObserver()