refactor: Switch from maestro to flutter integration tests

integration_test/flows/auth_flows.dart

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+import 'package:fluffychat/pages/sign_in/view_model/model/public_homeserver_data.dart';
+import 'package:flutter/material.dart';
+
+import '../data/environment_constants.dart';
+import '../utils/fluffy_chat_tester.dart';
+
+extension AuthFlows on FluffyChatTester {
+  Future<void> login() async {
+    await waitFor('Sign in');
+    await tapOn('Sign in');
+    await enterText(TextField, 'http://$homeserver', index: 0);
+    await tapOn(RadioListTile<PublicHomeserverData>, index: 0);
+    await tapOn('Continue');
+    await waitFor('Log in to http://$homeserver');
+    await enterText(TextField, user1Name, index: 0);
+    await enterText(TextField, user1Pw, index: 1);
+    await tapOn('Login');
+  }
+
+  Future<void> logout() async {
+    await tapOn(Key('accounts_and_settings_buttons'));
+    await tapOn('Settings');
+    await scrollUntilVisible('Logout');
+    await tapOn('Logout');
+    await tapOn(Key('ok_cancel_alert_dialog_ok_button'));
+    await waitFor('Sign in');
+  }
+
+  Future<void> skipNoNotificationsDialog() async {
+    if (await isVisible('Push notifications not available')) {
+      await tapOn('Do not show again');
+    }
+  }
+
+  Future<bool> ensureLoggedIn() async {
+    if (await isVisible('Sign in') == false) return false;
+
+    await login();
+    await tapOn(CloseButton);
+    await tapOn('Skip');
+    await skipNoNotificationsDialog();
+    return true;
+  }
+}

integration_test/flows/basic_messaging.dart

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+import 'package:fluffychat/pages/chat_list/chat_list.dart';
+import 'package:fluffychat/widgets/chat_settings_popup_menu.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../utils/fluffy_chat_tester.dart';
+import 'auth_flows.dart';
+
+Future<void> basicMessaging(WidgetTester widgetTester) => widgetTester
+    .startFluffyChatTest()
+    .then((tester) => tester._basicMessaging());
+
+extension on FluffyChatTester {
+  Future<void> _basicMessaging() async {
+    final shouldLogout = await ensureLoggedIn();
+
+    // Create a new group chat
+    await tapOn(FloatingActionButton);
+    await tapOn('Create group');
+    await enterText(TextField, 'Test Group 01');
+    await tapOn('Create a group and invite users');
+    await waitFor('Invite contact');
+    await goBack();
+
+    // Send a message
+    const testMessage = 'Hello from integration test!';
+    await enterText(Key('chat_input_field'), testMessage);
+    await tapOn(Key('send_button'));
+
+    // Ensure message is visible
+    await waitFor(testMessage);
+
+    // Archive the chat
+    await tapOn(ChatSettingsPopupMenu);
+    await tapOn('Leave');
+    await waitFor('Are you sure?');
+    await tapOn('Leave');
+    await waitFor(ChatList);
+
+    if (shouldLogout) await logout();
+  }
+}

integration_test/flows/login_and_chat_backup.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import '../utils/fluffy_chat_tester.dart';
+import 'auth_flows.dart';
+
+Future<void> loginAndChatBackup(WidgetTester widgetTester) => widgetTester
+    .startFluffyChatTest()
+    .then((tester) => tester._loginAndChatBackup());
+
+extension on FluffyChatTester {
+  Future<void> _loginAndChatBackup() async {
+    await login();
+
+    // Skip bootstrap
+    await tapOn('Copy to clipboard');
+    await tapOn('Next');
+    await tapOn('Close');
+
+    await skipNoNotificationsDialog();
+
+    await logout();
+  }
+}