feat: send bus message on skill load (#727)

* feat: send bus message on skill load

* Update ovos_core/skill_manager.py

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update test/unittests/test_skill_manager.py

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* fix AI suggestion formatting

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: mikejgray

ovos_core/skill_manager.py

@@ -355,6 +355,8 @@ def _load_plugin_skill(self, skill_id, skill_plugin):
         skill_loader = self._get_plugin_skill_loader(skill_id, skill_class=skill_plugin)
         try:
             load_status = skill_loader.load(skill_plugin)
+            if load_status:
+                self.bus.emit(Message("mycroft.skill.loaded", {"skill_id": skill_id}))
         except Exception:
             LOG.exception(f'Load of skill {skill_id} failed!')
             load_status = False

test/unittests/test_skill_manager.py

@@ -175,3 +175,105 @@ def test_activate_skill(self):
         self.skill_manager.activate_skill(message)
         test_skill_loader.activate.assert_called_once()
         message.response.assert_called_once()
+
+    def test_load_plugin_skill_success(self):
+        """Test successful plugin skill loading emits the correct message."""
+        skill_id = 'test.plugin.skill'
+        mock_plugin = Mock()
+
+        # Setup mock loader following existing patterns
+        mock_loader = Mock(spec=SkillLoader)
+        mock_loader.skill_id = skill_id
+        mock_loader.load.return_value = True
+
+        # Mock _get_plugin_skill_loader to return our mock
+        self.skill_manager._get_plugin_skill_loader = Mock(return_value=mock_loader)
+
+        # Reset message tracking
+        self.message_bus_mock.message_types = []
+        self.message_bus_mock.message_data = []
+        self.skill_manager.plugin_skills = {}
+
+        # Call the method
+        result = self.skill_manager._load_plugin_skill(skill_id, mock_plugin)
+
+        # Verify message was emitted
+        self.assertIn('mycroft.skill.loaded', self.message_bus_mock.message_types)
+        loaded_msg_idx = self.message_bus_mock.message_types.index('mycroft.skill.loaded')
+        self.assertEqual(
+            {'skill_id': skill_id},
+            self.message_bus_mock.message_data[loaded_msg_idx]
+        )
+
+        # Verify loader was called
+        mock_loader.load.assert_called_once_with(mock_plugin)
+
+        # Verify skill was added to plugin_skills
+        self.assertIn(skill_id, self.skill_manager.plugin_skills)
+        self.assertEqual(mock_loader, self.skill_manager.plugin_skills[skill_id])
+
+        # Verify return value
+        self.assertEqual(result, mock_loader)
+
+    def test_load_plugin_skill_failure(self):
+        """Test failed plugin skill loading is handled gracefully."""
+        skill_id = 'test.failing.skill'
+        mock_plugin = Mock()
+
+        # Setup mock loader to raise exception
+        mock_loader = Mock(spec=SkillLoader)
+        mock_loader.skill_id = skill_id
+        mock_loader.load.side_effect = Exception("Skill load failed!")
+
+        # Mock _get_plugin_skill_loader to return our mock
+        self.skill_manager._get_plugin_skill_loader = Mock(return_value=mock_loader)
+
+        # Reset message tracking
+        self.message_bus_mock.message_types = []
+        self.message_bus_mock.message_data = []
+        self.skill_manager.plugin_skills = {}
+
+        # Call the method
+        result = self.skill_manager._load_plugin_skill(skill_id, mock_plugin)
+
+        # Verify NO success message was emitted
+        self.assertNotIn('mycroft.skill.loaded', self.message_bus_mock.message_types)
+
+        # Verify exception was logged
+        self.log_mock.exception.assert_called_once()
+
+        # Verify skill was still added to plugin_skills (even on failure)
+        self.assertIn(skill_id, self.skill_manager.plugin_skills)
+        self.assertEqual(mock_loader, self.skill_manager.plugin_skills[skill_id])
+
+        # Verify return value is None on failure
+        self.assertIsNone(result)
+
+    def test_load_plugin_skill_returns_false(self):
+        """Test plugin skill loading that returns False (load failed gracefully)."""
+        skill_id = 'test.false.skill'
+        mock_plugin = Mock()
+
+        # Setup mock loader to return False (failed but no exception)
+        mock_loader = Mock(spec=SkillLoader)
+        mock_loader.skill_id = skill_id
+        mock_loader.load.return_value = False
+
+        # Mock _get_plugin_skill_loader to return our mock
+        self.skill_manager._get_plugin_skill_loader = Mock(return_value=mock_loader)
+
+        # Reset message tracking
+        self.message_bus_mock.message_types = []
+        self.skill_manager.plugin_skills = {}
+
+        # Call the method
+        result = self.skill_manager._load_plugin_skill(skill_id, mock_plugin)
+
+        # Verify NO success message was emitted (load returned False)
+        self.assertNotIn('mycroft.skill.loaded', self.message_bus_mock.message_types)
+
+        # Verify skill was added to plugin_skills
+        self.assertIn(skill_id, self.skill_manager.plugin_skills)
+
+        # Verify return value is None when load returns False
+        self.assertIsNone(result)