test: add context menu test

frontend/app_flowy/packages/appflowy_editor/test/service/selection_service_test.dart

@@ -1,4 +1,6 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:appflowy_editor/src/service/context_menu/context_menu.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter_test/flutter_test.dart';
 import '../infra/test_editor.dart';
 
@@ -79,5 +81,50 @@ void main() async {
         Selection.single(path: [1], startOffset: 0, endOffset: text.length),
       );
     });
+
+    testWidgets('Test secondary tap', (tester) async {
+      const text = 'Welcome to Appflowy 😁';
+      final editor = tester.editor
+        ..insertTextNode(text)
+        ..insertTextNode(text)
+        ..insertTextNode(text);
+      await editor.startTesting();
+
+      final secondTextNode = editor.nodeAtPath([1]) as TextNode;
+      final finder = find.byKey(secondTextNode.key!);
+
+      final rect = tester.getRect(finder);
+      // secondary tap
+      await tester.tapAt(
+        rect.centerLeft + const Offset(10.0, 0.0),
+        buttons: kSecondaryButton,
+      );
+      await tester.pump();
+
+      const welcome = 'Welcome';
+      expect(
+        editor.documentSelection,
+        Selection.single(
+          path: [1],
+          startOffset: 0,
+          endOffset: welcome.length,
+        ), // Welcome
+      );
+
+      final contextMenu = find.byType(ContextMenu);
+      expect(contextMenu, findsOneWidget);
+
+      // test built in context menu items
+
+      // cut
+      await tester.tap(find.text('Cut'));
+      await tester.pump();
+      expect(
+        secondTextNode.toPlainText(),
+        text.replaceAll(welcome, ''),
+      );
+
+      // TODO: the copy and paste test is not working during test env.
+    });
   });
 }