test

src/framesvg/__init__.py

@@ -252,6 +252,10 @@ def create_animated_svg_string(frames: list[str], max_dims: dict[str, int], fps:
 
 def save_svg_to_file(svg_string: str, output_path: str) -> None:
     """Writes SVG string to file."""
+    if os.path.isdir(output_path):
+        msg = "'%s' is a directory, not a file."
+        logging.exception(msg, output_path)
+        raise IsADirectoryError(msg, output_path)
     try:
         with open(output_path, "w", encoding="utf-8") as f:
             f.write(svg_string)

tests/test_app.py

@@ -707,7 +707,7 @@ def test_save_svg_to_file_errors(tmp_path, sample_svg_content):
 
     output_directory = tmp_path / "output_dir"
     output_directory.mkdir()
-    with pytest.raises(PermissionError):
+    with pytest.raises(IsADirectoryError):
         save_svg_to_file(sample_svg_content, str(output_directory))
 
 
@@ -720,7 +720,7 @@ def test_convert_and_write_gif_to_animated_svg_integration(tmp_path):
 
     output_directory = tmp_path / "output_dir"
     output_directory.mkdir()
-    with pytest.raises(PermissionError):
+    with pytest.raises(IsADirectoryError):
         convert_and_write_gif_to_animated_svg(gif_input_path, str(output_directory))