app test: Make a prepare accept a list of accounts, instead of one

Also make it explicitly specify which account to log out in the list of
accounts.

Author: sm-sayedi

test/widgets/app_test.dart

@@ -319,13 +319,21 @@ void main() {
     });
 
     group('log out', () {
-      Future<(Widget, Widget)> prepare(WidgetTester tester, {required Account account}) async {
-        await setupChooseAccountPage(tester, accounts: [account]);
-
-        final findThreeDotsButton = find.descendant(
-          of: find.widgetWithText(Card, eg.selfAccount.realmUrl.toString()),
+      Future<(Widget, Widget)> prepare(WidgetTester tester, {
+        required List<Account> accounts,
+        required Account logoutAccount,
+      }) async {
+        assert(accounts.contains(logoutAccount));
+
+        await setupChooseAccountPage(tester, accounts: accounts);
+
+        final findAccountCard = find.ancestor(of: find.text(logoutAccount.realmUrl.toString()),
+          matching: find.ancestor(of: find.text(logoutAccount.email),
+            matching: find.byType(Card)));
+        final findThreeDotsButton = find.descendant(of: findAccountCard,
           matching: find.byIcon(Icons.adaptive.more));
 
+        await tester.scrollUntilVisible(findThreeDotsButton, 50);
         await tester.tap(findThreeDotsButton);
         await tester.pump();
         await tester.tap(find.descendant(
@@ -338,14 +346,16 @@ void main() {
       }
 
       testWidgets('user confirms logging out', (tester) async {
-        final (actionButton, _) = await prepare(tester, account: eg.selfAccount);
+        final (actionButton, _) = await prepare(tester,
+          accounts: [eg.selfAccount], logoutAccount: eg.selfAccount);
         await tester.tap(find.byWidget(actionButton));
         await tester.pump(TestGlobalStore.removeAccountDuration);
         check(testBinding.globalStore).accounts.isEmpty();
       });
 
       testWidgets('user cancels logging out', (tester) async {
-        final (_, cancelButton) = await prepare(tester, account: eg.selfAccount);
+        final (_, cancelButton) = await prepare(tester,
+          accounts: [eg.selfAccount], logoutAccount: eg.selfAccount);
         await tester.tap(find.byWidget(cancelButton));
         await tester.pumpAndSettle();
         check(testBinding.globalStore).accounts.deepEquals([eg.selfAccount]);