diff --git a/test/features/base/extensions/context_menu_action_list_ext_test.dart b/test/features/base/extensions/context_menu_action_list_ext_test.dart
new file mode 100644
index 000000000..b01ff2f56
--- /dev/null
+++ b/test/features/base/extensions/context_menu_action_list_ext_test.dart
@@ -0,0 +1,100 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/base/extensions/context_menu_action_list_extension.dart';
+import 'package:tmail_ui_user/features/base/widget/context_menu/context_menu_item_action.dart';
+
+/// Fake subclass to test grouping
+class FakeContextMenuAction extends ContextMenuItemAction<String> {
+  FakeContextMenuAction(super.action, {super.key, super.category});
+
+  @override
+  String get actionName => action;
+}
+
+void main() {
+  group('ContextMenuActionListExt.groupByCategory', () {
+    test('should group actions by category correctly', () {
+      // Arrange
+      final actions = [
+        FakeContextMenuAction('Cut', category: 0),
+        FakeContextMenuAction('Copy', category: 0),
+        FakeContextMenuAction('Paste', category: 1),
+        FakeContextMenuAction('SelectAll', category: 2),
+        FakeContextMenuAction('Other', category: -1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.length, 4);
+      expect(grouped.keys, orderedEquals([0, 1, 2, -1])); // sorted, -1 last
+
+      expect(grouped[0]!.map((a) => a.action).toList(), ['Cut', 'Copy']);
+      expect(grouped[1]!.map((a) => a.action).toList(), ['Paste']);
+      expect(grouped[2]!.map((a) => a.action).toList(), ['SelectAll']);
+      expect(grouped[-1]!.map((a) => a.action).toList(), ['Other']);
+    });
+
+    test('should return empty map when list is empty', () {
+      // Arrange
+      final actions = <FakeContextMenuAction>[];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped, isEmpty);
+    });
+
+    test('should correctly sort integer keys ascending and move -1 to bottom',
+        () {
+      // Arrange
+      final actions = [
+        FakeContextMenuAction('ActionA', category: 3),
+        FakeContextMenuAction('ActionB', category: 1),
+        FakeContextMenuAction('ActionC', category: -1),
+        FakeContextMenuAction('ActionD', category: 2),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.keys.toList(), orderedEquals([1, 2, 3, -1]));
+    });
+
+    test('should handle multiple actions with same category', () {
+      // Arrange
+      final actions = [
+        FakeContextMenuAction('Cut', category: 0),
+        FakeContextMenuAction('Copy', category: 0),
+        FakeContextMenuAction('Paste', category: 1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped[0]!.length, 2);
+      expect(grouped[1]!.length, 1);
+    });
+
+    test('should place all -1 category items at the end regardless of order',
+        () {
+      // Arrange
+      final actions = [
+        FakeContextMenuAction('Unknown1', category: -1),
+        FakeContextMenuAction('Edit', category: 0),
+        FakeContextMenuAction('Unknown2', category: -1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.keys.toList(), orderedEquals([0, -1]));
+      expect(
+          grouped[-1]!.map((a) => a.action).toList(), ['Unknown1', 'Unknown2']);
+    });
+  });
+}
diff --git a/test/features/base/extensions/popup_menu_action_list_extension_test.dart b/test/features/base/extensions/popup_menu_action_list_extension_test.dart
new file mode 100644
index 000000000..dac42392b
--- /dev/null
+++ b/test/features/base/extensions/popup_menu_action_list_extension_test.dart
@@ -0,0 +1,99 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/base/extensions/popup_menu_action_list_extension.dart';
+import 'package:tmail_ui_user/features/base/model/popup_menu_item_action.dart';
+
+/// A simple fake implementation of PopupMenuItemAction
+class FakePopupAction extends PopupMenuItemAction<String> {
+  FakePopupAction(super.action, {super.key, super.category});
+
+  @override
+  String get actionName => action;
+}
+
+void main() {
+  group('PopupMenuActionListExtension.groupByCategory', () {
+    test('should group actions by category correctly', () {
+      // Arrange
+      final actions = [
+        FakePopupAction('A1', category: 1),
+        FakePopupAction('A2', category: 1),
+        FakePopupAction('B1', category: 2),
+        FakePopupAction('C1', category: 3),
+        FakePopupAction('NoCategory', category: -1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.length, 4);
+      expect(grouped.keys, orderedEquals([1, 2, 3, -1])); // sorted with -1 last
+
+      expect(grouped[1]!.map((e) => e.action), ['A1', 'A2']);
+      expect(grouped[2]!.map((e) => e.action), ['B1']);
+      expect(grouped[3]!.map((e) => e.action), ['C1']);
+      expect(grouped[-1]!.map((e) => e.action), ['NoCategory']);
+    });
+
+    test('should return empty map when list is empty', () {
+      // Arrange
+      final actions = <FakePopupAction>[];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped, isEmpty);
+    });
+
+    test('should correctly sort integer keys ascending and move -1 to bottom',
+        () {
+      // Arrange
+      final actions = [
+        FakePopupAction('A', category: 5),
+        FakePopupAction('B', category: 2),
+        FakePopupAction('C', category: -1),
+        FakePopupAction('D', category: 3),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.keys.toList(), orderedEquals([2, 3, 5, -1]));
+    });
+
+    test('should handle multiple actions with same category', () {
+      // Arrange
+      final actions = [
+        FakePopupAction('A1', category: 0),
+        FakePopupAction('A2', category: 0),
+        FakePopupAction('B1', category: 1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped[0]!.length, 2);
+      expect(grouped[1]!.length, 1);
+    });
+
+    test('should place all -1 category items at the end regardless of position',
+        () {
+      // Arrange
+      final actions = [
+        FakePopupAction('No1', category: -1),
+        FakePopupAction('Cat1', category: 0),
+        FakePopupAction('No2', category: -1),
+      ];
+
+      // Act
+      final grouped = actions.groupByCategory();
+
+      // Assert
+      expect(grouped.keys.toList(), orderedEquals([0, -1]));
+      expect(grouped[-1]!.map((e) => e.action).toList(), ['No1', 'No2']);
+    });
+  });
+}