add additional edge case to find models

src/dopt_sensor_anomalies/_find_paths.py

@@ -7,26 +7,43 @@ from dopt_sensor_anomalies.constants import LIB_ROOT_PATH, MODEL_FOLDER_NAME, ST
 
 
 def get_model_folder() -> Path:
+    """retrieves the folder which contains the trained and needed models for anomaly detection
+
+    Returns
+    -------
+    Path
+        the path containing the models
+
+    Raises
+    ------
+    FileNotFoundError
+        raised if the application's root folder is not found or the model folder is not present
+    """
+
     path_found = dopt_basics.io.search_folder_path(
         starting_path=LIB_ROOT_PATH, stop_folder_name=STOP_FOLDER_NAME
     )
     if path_found is None:
+        raise FileNotFoundError("The application's root directory could not be determined.")
+
+    model_folder = path_found / MODEL_FOLDER_NAME
+    if not model_folder.exists():
         raise FileNotFoundError(
             "The model folder was not found in the application's root directory."
         )
 
-    return path_found / MODEL_FOLDER_NAME
+    return model_folder
 
 
 def get_detection_models(model_folder: Path) -> t.DetectionModels:
     left_model_search = tuple(model_folder.glob("*left_hand_side*.pth"))
-    if not left_model_search:
+    if len(left_model_search) == 0:
         raise ValueError("No model for the left hand side found.")
     if len(left_model_search) > 1:
         raise ValueError("Too many models for the left hand side found.")
 
     right_model_search = tuple(model_folder.glob("*right_hand_side*.pth"))
-    if not right_model_search:
+    if len(right_model_search) == 0:
         raise ValueError("No model for the right hand side found.")
     elif len(right_model_search) > 1:
         raise ValueError("Too many models for the right hand side found.")

tests/test_find_paths.py

@@ -56,8 +56,20 @@ def temp_model_folder_only_right(tmp_path_factory) -> Path:
 
 
 @patch("dopt_sensor_anomalies._find_paths.STOP_FOLDER_NAME", "not-found")
-def test_get_model_folder_Fail_NotFound():
-    with pytest.raises(FileNotFoundError):
+def test_get_model_folder_Fail_NotFoundApplicationRoot():
+    with pytest.raises(
+        FileNotFoundError, match="application's root directory could not be determined"
+    ):
+        _ = _find_paths.get_model_folder()
+
+
+@patch("dopt_sensor_anomalies._find_paths.STOP_FOLDER_NAME", "lib")
+@patch("dopt_sensor_anomalies._find_paths.MODEL_FOLDER_NAME", "not-found")
+def test_get_model_folder_Fail_NotFoundModelFolder():
+    with pytest.raises(
+        FileNotFoundError,
+        match="model folder was not found in the application's root directory",
+    ):
         _ = _find_paths.get_model_folder()