TST: Check error raised when inserting wrong length categorical column (#29523)

Author: ryankarlos

pandas/tests/frame/test_indexing.py

@@ -3881,3 +3881,11 @@ def test_loc_indexing_preserves_index_category_dtype(self):
 
  result = df.loc[["a"]].index.levels[0]
  tm.assert_index_equal(result, expected)
+
+ def test_wrong_length_cat_dtype_raises(self):
+ # GH29523
+ cat = pd.Categorical.from_codes([0, 1, 1, 0, 1, 2], ["a", "b", "c"])
+ df = pd.DataFrame({"bar": range(10)})
+ err = "Length of values does not match length of index"
+ with pytest.raises(ValueError, match=err):
+ df["foo"] = cat