chore: optimize the integration test UI

frontend/appflowy_flutter/integration_test/util/expectation.dart

@@ -0,0 +1,76 @@
+import 'package:appflowy/generated/locale_keys.g.dart';
+import 'package:appflowy/plugins/document/presentation/banner.dart';
+import 'package:appflowy/workspace/presentation/home/home_stack.dart';
+import 'package:appflowy/workspace/presentation/home/menu/app/section/item.dart';
+import 'package:easy_localization/easy_localization.dart';
+import 'package:flowy_infra_ui/flowy_infra_ui.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+const String readme = 'Read me';
+
+extension Expectation on WidgetTester {
+  /// Expect to see the home page and with a default read me page.
+  void expectToSeeHomePage() {
+    expect(find.byType(HomeStack), findsOneWidget);
+    expect(find.textContaining(readme), findsOneWidget);
+  }
+
+  /// Expect to see the page name on the home page.
+  void expectToSeePageName(String name) {
+    final pageName = findPageName(name);
+    expect(pageName, findsOneWidget);
+  }
+
+  /// Expect not to see the page name on the home page.
+  void expectNotToSeePageName(String name) {
+    final pageName = findPageName(name);
+    expect(pageName, findsNothing);
+  }
+
+  /// Expect to see the document banner.
+  void expectToSeeDocumentBanner() {
+    expect(find.byType(DocumentBanner), findsOneWidget);
+  }
+
+  /// Expect not to see the document banner.
+  void expectNotToSeeDocumentBanner() {
+    expect(find.byType(DocumentBanner), findsNothing);
+  }
+
+  /// Expect to the markdown file export success dialog.
+  void expectToExportSuccess() {
+    final exportSuccess = find.byWidgetPredicate(
+      (widget) =>
+          widget is FlowyText &&
+          widget.title == LocaleKeys.settings_files_exportFileSuccess.tr(),
+    );
+    expect(exportSuccess, findsOneWidget);
+  }
+
+  /// Expect to see the add button and icon button inside the document.
+  void expectToSeePluginAddCoverAndIconButton() {
+    final addCover = find.textContaining(
+      LocaleKeys.document_plugins_cover_addCover.tr(),
+    );
+    final addIcon = find.textContaining(
+      LocaleKeys.document_plugins_cover_addIcon.tr(),
+    );
+    expect(addCover, findsOneWidget);
+    expect(addIcon, findsOneWidget);
+  }
+
+  /// Expect to see the user name on the home page
+  void expectToSeeUserName(String name) {
+    final userName = find.byWidgetPredicate(
+      (widget) => widget is FlowyText && widget.title == name,
+    );
+    expect(userName, findsOneWidget);
+  }
+
+  /// Find the page name on the home page.
+  Finder findPageName(String name) {
+    return find.byWidgetPredicate(
+      (widget) => widget is ViewSectionItem && widget.view.name == name,
+    );
+  }
+}