TF-3493 Refactor integration test code for performance and maintainability

Signed-off-by: dab246 <tdvu@linagora.com>

integration_test/base/base_test_scenario.dart

@@ -0,0 +1,18 @@
+
+import '../mixin/requires_login_mixin.dart';
+import '../mixin/scenario_utils_mixin.dart';
+import 'base_scenario.dart';
+
+abstract class BaseTestScenario extends BaseScenario
+    with RequiresLoginMixin, ScenarioUtilsMixin {
+
+  const BaseTestScenario(super.$);
+
+  @override
+  Future<void> execute() async {
+    await executeLoginScenario();
+    await runTestLogic();
+  }
+
+  Future<void> runTestLogic();
+}

integration_test/base/test_base.dart

@@ -3,10 +3,17 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:patrol/patrol.dart';
 import 'package:tmail_ui_user/main.dart' as app;
 
+import 'base_scenario.dart';
+
 class TestBase {
+  static final TestBase _instance = TestBase._internal();
+  factory TestBase() => _instance;
+
+  TestBase._internal();
+
   void runPatrolTest({
     required String description,
-    required Function(PatrolIntegrationTester $) test,
+    required BaseScenario Function(PatrolIntegrationTester $) scenarioBuilder,
   }) {
     patrolTest(
       description,
@@ -19,15 +26,19 @@ class TestBase {
         findTimeout: Duration(seconds: 10),
       ),
       framePolicy: LiveTestWidgetsFlutterBindingFramePolicy.benchmarkLive,
-    ($) async {
-      await app.runTmail();
-      // https://github.com/leancodepl/patrol/issues/1602#issuecomment-1665317814
-      final originalOnError = FlutterError.onError!;
-      FlutterError.onError = (FlutterErrorDetails details) {
-        originalOnError(details);
-      };
-      
-      await test($);
-    });
+      ($) async {
+        await setupTest();
+        await scenarioBuilder($).execute();
+      },
+    );
+  }
+
+  Future<void> setupTest() async {
+    await app.runTmail();
+
+    final originalOnError = FlutterError.onError!;
+    FlutterError.onError = (FlutterErrorDetails details) {
+      originalOnError(details);
+    };
   }
 }