fix(ci): resolve mypy and pytest errors

- Fixes a `mypy` error (`truthy-function`) by making the check for the optional `watchdog` dependency more explicit.
- Updates `pytest` tests to reflect the renaming of `load_kube_config` to `reload_kube_config_if_changed`.
- Removes obsolete patches from tests that were causing `AttributeError`.

This commit addresses the CI failures introduced in the previous commit.

Author: KKamJi98

kubernetes_monitoring.py

@@ -65,7 +65,7 @@
 
 
 # Kubeconfig 변경을 감지하는 핸들러
-if FileSystemEventHandler:
+if Observer is not None and FileSystemEventHandler is not None:
 
     class KubeConfigChangeHandler(FileSystemEventHandler):
         """Kubeconfig 파일 변경을 감지하여 플래그를 설정."""
@@ -98,7 +98,6 @@ def start_kube_config_watcher() -> None:
     observer.start()
 
 
-
 # 노드그룹 라벨을 변수로 분리 (기본값: node.kubernetes.io/app)
 NODE_GROUP_LABEL = "node.kubernetes.io/app"
 
@@ -2735,7 +2734,7 @@ def watch_pod_resources() -> None:
                                 console.print(
                                     "[bold red]NodeGroup 필터에 해당하는 노드를 찾을 수 없습니다. 필터를 리셋합니다.[/bold red]"
                                 )
-                                filter_nodegroup = "" # Reset filter
+                                filter_nodegroup = ""  # Reset filter
 
                     metrics, error, kubectl_cmd = _get_kubectl_top_pod(namespace)
                     if error:

tests/test_kubernetes_monitoring.py

@@ -86,29 +86,28 @@ def test_get_kubectl_top_pod_failure(mock_run):
 
 
 @patch("kubernetes_monitoring.config")
-def test_load_kube_config_success(mock_config):
-    """Test successful kube config loading"""
+def test_reload_kube_config_success(mock_config):
+    """Test successful kube config reloading"""
     mock_config.load_kube_config.return_value = None
 
-    # Should not raise an exception
-    kubernetes_monitoring.load_kube_config()
+    # Should return True on success
+    result = kubernetes_monitoring.reload_kube_config_if_changed(force=True)
+    assert result is True
     mock_config.load_kube_config.assert_called_once()
 
 
 @patch("kubernetes_monitoring.config")
-@patch("sys.exit")
-def test_load_kube_config_failure(mock_exit, mock_config):
-    """Test kube config loading failure"""
+def test_reload_kube_config_failure(mock_config):
+    """Test kube config reloading failure"""
     mock_config.load_kube_config.side_effect = Exception("Config error")
 
-    kubernetes_monitoring.load_kube_config()
-    mock_exit.assert_called_once_with(1)
+    result = kubernetes_monitoring.reload_kube_config_if_changed(force=True)
+    assert result is False
 
 
 @patch("kubernetes_monitoring.Prompt.ask")
 @patch("kubernetes_monitoring.client")
-@patch("kubernetes_monitoring.load_kube_config")
-def test_choose_namespace_success(mock_load_config, mock_client, mock_prompt):
+def test_choose_namespace_success(mock_client, mock_prompt):
     """Test successful namespace selection"""
     # Mock the namespace list
     mock_ns = MagicMock()
@@ -126,19 +125,16 @@ def test_choose_namespace_success(mock_load_config, mock_client, mock_prompt):
 
     # This should not raise an exception
     kubernetes_monitoring.choose_namespace()
-    mock_load_config.assert_called_once()
 
 
 @patch("kubernetes_monitoring.client")
-@patch("kubernetes_monitoring.load_kube_config")
-def test_choose_namespace_failure(mock_load_config, mock_client):
+def test_choose_namespace_failure(mock_client):
     """Test namespace selection failure"""
     mock_v1 = MagicMock()
     mock_v1.list_namespace.side_effect = Exception("API error")
     mock_client.CoreV1Api.return_value = mock_v1
 
     kubernetes_monitoring.choose_namespace()
-    assert mock_load_config.called
 
 
 def test_save_markdown_snapshot_success(tmp_path, monkeypatch):