fix tests

Author: Andy Landy

tests/test_utils.py

@@ -167,7 +167,7 @@ def run_code_in_jupyter(tmp_path, lines: List[str]) -> str:
     out_path = tmp_path / 'output.ipynb'
     run_cmd([
         'jupyter', 'nbconvert', '--execute', '--allow-errors', '--to',
-        'notebook', '--output', out_path.relative_to(inp_path.parent), str(inp_path),
+        'notebook', '--output', str(out_path.relative_to(inp_path.parent)), str(inp_path),
     ])
 
     with out_path.open('r') as inp: