actions test [nfc]: Have prepare take an optional ackedPushToken

We'll use this soon for testing the unregister-token part of logging
out.

Author: chrisbobbe

test/widgets/actions_test.dart

@@ -30,14 +30,16 @@ void main() {
 
   Future<void> prepare(WidgetTester tester, {
     UnreadMessagesSnapshot? unreadMsgs,
+    String? ackedPushToken = '123',
   }) async {
     addTearDown(testBinding.reset);
-    await testBinding.globalStore.add(eg.selfAccount, eg.initialSnapshot(
+    final selfAccount = eg.selfAccount.copyWith(ackedPushToken: Value(ackedPushToken));
+    await testBinding.globalStore.add(selfAccount, eg.initialSnapshot(
       unreadMsgs: unreadMsgs));
-    store = await testBinding.globalStore.perAccount(eg.selfAccount.id);
+    store = await testBinding.globalStore.perAccount(selfAccount.id);
     connection = store.connection as FakeApiConnection;
 
-    await tester.pumpWidget(TestZulipApp(accountId: eg.selfAccount.id,
+    await tester.pumpWidget(TestZulipApp(accountId: selfAccount.id,
       child: const Scaffold(body: Placeholder())));
     await tester.pump();
     context = tester.element(find.byType(Placeholder));