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test: Fix tests for polars v2.0.0rc1 #399

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Merged
Oliver Borchert (borchero) merged 2 commits into from
Sep 3, 2026
Merged

test: Fix tests for polars v2.0.0rc1 #399

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a05b1ca
test: Fix tests for polars v2.0.0rc1
borchero Sep 3, 2026
d5bb90a
Update comment for lazy validation in test
borchero Sep 3, 2026
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7 changes: 5 additions & 2 deletions tests/schema/test_validate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
# SPDX-License-Identifier: BSD-3-Clause

from pathlib import Path
from typing import Literal

import polars as pl
import polars.exceptions as plexc
Expand Down Expand Up @@ -55,6 +56,7 @@ def _validate_and_collect(
df: pl.DataFrame | pl.LazyFrame,
*,
cast: bool = False,
engine: Literal["auto", "in-memory"] = "auto",
) -> pl.DataFrame:
# Whether validation is performed eagerly is now determined by the input type: an
# eager data frame raises within `validate`, a lazy frame raises upon collection.
Expand All @@ -64,7 +66,7 @@ def _validate_and_collect(
return result
else:
assert isinstance(result, pl.LazyFrame)
return result.collect()
return result.collect(engine=engine)


# -------------------------------------- SCHEMA -------------------------------------- #
Expand Down Expand Up @@ -146,7 +148,8 @@ def test_invalid_primary_key_with_examples(
ValidationError if eager else plexc.ComputeError,
match=r"'primary_key' failed for 2 rows; examples: \[\{'a': 1\}\]",
):
_validate_and_collect(MySchema, df)
# For lazy validation, Polars' streaming engine can fail fast and may only count the first batch.
_validate_and_collect(MySchema, df, engine="in-memory")


@pytest.mark.parametrize("df_type", [pl.DataFrame, pl.LazyFrame])
Expand Down