add debug assertion

narwhals-dev · Feb 22, 2024 · 13580c6 · 13580c6
1 parent 65f8457
commit 13580c6
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/narwhals/pandas_like/utils.py b/narwhals/pandas_like/utils.py
@@ -201,6 +201,8 @@ def func(df: DataFrame | LazyFrame) -> list[Series]:
                 out.append(_out)
             else:
                 out.append(plx._create_series_from_scalar(_out, column))
+        if expr._output_names is not None:
+            assert [s._series.name for s in out] == expr._output_names
         return out
 
     root_names = copy(expr._root_names)