From 13580c63c8109bd5a389f04cb2bae9bdbf36944e Mon Sep 17 00:00:00 2001
From: Marco Gorelli <33491632+MarcoGorelli@users.noreply.github.com>
Date: Thu, 22 Feb 2024 14:35:36 +0000
Subject: [PATCH] add debug assertion

---
 narwhals/pandas_like/utils.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/narwhals/pandas_like/utils.py b/narwhals/pandas_like/utils.py
index dbfcd8e16..243ac4aa9 100644
--- 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)