test: additional tests for error handling for yaml_dialog.py

tests/test_yaml_dialog.py

@@ -45,6 +45,97 @@ def test_load_yaml(qtbot, example_widget):
     os.remove(temp_file.name)  # Clean up
 
 
+def test_load_yaml_file_not_found(qtbot, example_widget, capsys):
+    def load_yaml_wrapper():
+        config = load_yaml(example_widget)
+        if config:
+            example_widget.config.update(config)
+
+    example_widget.import_button.clicked.connect(load_yaml_wrapper)
+
+    # Mock user selecting a non-existent file in the dialog
+    with patch(
+        "qtpy.QtWidgets.QFileDialog.getOpenFileName", return_value=("non_existent_file.yaml", "")
+    ):
+        example_widget.import_button.click()
+
+    # Catch the print output
+    captured = capsys.readouterr()
+    assert "The file non_existent_file.yaml was not found." in captured.out
+
+    assert example_widget.config == {}  # No update should happen
+
+
+def test_load_yaml_general_exception(qtbot, example_widget, capsys, monkeypatch):
+    # Mock the open function to raise a general exception
+    def mock_open(*args, **kwargs):
+        raise Exception("General error")
+
+    monkeypatch.setattr("builtins.open", mock_open)
+
+    def load_yaml_wrapper():
+        config = load_yaml(example_widget)
+        if config:
+            example_widget.config.update(config)
+
+    example_widget.import_button.clicked.connect(load_yaml_wrapper)
+
+    # Mock user selecting a file in the dialog
+    with patch("qtpy.QtWidgets.QFileDialog.getOpenFileName", return_value=("somefile.yaml", "")):
+        example_widget.import_button.click()
+
+    assert example_widget.config == {}
+
+
+def test_load_yaml_permission_error(qtbot, example_widget, monkeypatch, capsys):
+    # Create a temporary file and remove read permissions
+    with tempfile.NamedTemporaryFile(delete=False, suffix=".yaml") as temp_file:
+        temp_file_path = temp_file.name
+    os.chmod(temp_file_path, 0o000)  # Remove permissions
+
+    def load_yaml_wrapper():
+        config = load_yaml(example_widget)
+        if config:
+            example_widget.config.update(config)
+
+    example_widget.import_button.clicked.connect(load_yaml_wrapper)
+
+    # Mock user selecting the file in the dialog
+    with patch("qtpy.QtWidgets.QFileDialog.getOpenFileName", return_value=(temp_file_path, "")):
+        example_widget.import_button.click()
+
+    # Catch the print output
+    captured = capsys.readouterr()
+    assert "Permission denied for file" in captured.out
+
+    assert example_widget.config == {}  # No update should happen
+    os.remove(temp_file_path)  # Clean up
+
+
+def test_load_yaml_invalid_yaml(qtbot, example_widget, capsys):
+    # Create a temporary file with invalid YAML content
+    with tempfile.NamedTemporaryFile(delete=False, suffix=".yaml") as temp_file:
+        temp_file.write(b"\tinvalid_yaml: [unbalanced_brackets: ]")
+
+    def load_yaml_wrapper():
+        config = load_yaml(example_widget)
+        if config:
+            example_widget.config.update(config)
+
+    example_widget.import_button.clicked.connect(load_yaml_wrapper)
+
+    # Mock user selecting the file in the dialog
+    with patch("qtpy.QtWidgets.QFileDialog.getOpenFileName", return_value=(temp_file.name, "")):
+        example_widget.import_button.click()
+
+    # Catch the print output
+    captured = capsys.readouterr()
+    assert "Error parsing YAML file" in captured.out
+
+    assert example_widget.config == {}  # No update should happen
+    os.remove(temp_file.name)  # Clean up
+
+
 def test_save_yaml(qtbot, example_widget):
     # Create a temporary file
     with tempfile.NamedTemporaryFile(delete=False, suffix=".yaml") as temp_file: