add tests

tests/pickle_test.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from dataclasses import asdict
+from dataclasses import dataclass
+from typing import Sequence
+
+import pandas as pd
+import polars as pl
+
+import narwhals.stable.v1 as nw
+
+
+def test_dataclass() -> None:
+    # https://github.com/narwhals-dev/narwhals/issues/1486
+    @dataclass
+    class Foo:
+        a: Sequence[int]
+
+    # dry-run to check that none of these error
+    asdict(Foo(pd.Series([1, 2, 3])))
+    asdict(Foo(pl.Series([1, 2, 3])))  # type: ignore[arg-type]
+    asdict(Foo(nw.from_native(pl.Series([1, 2, 3]), series_only=True)))  # type: ignore[arg-type]
+    asdict(Foo(nw.from_native(pd.Series([1, 2, 3]), series_only=True)))  # type: ignore[arg-type]