test: fixup cudf failures (#2181)

Author: MarcoGorelli

tests/expr_and_series/cum_sum_test.py

@@ -54,6 +54,9 @@ def test_lazy_cum_sum_grouped(
         request.applymarker(pytest.mark.xfail)
     if "polars" in str(constructor) and POLARS_VERSION < (1, 9):
         pytest.skip(reason="too old version")
+    if "cudf" in str(constructor):
+        # https://github.com/rapidsai/cudf/issues/18159
+        request.applymarker(pytest.mark.xfail)
 
     df = nw.from_native(
         constructor(
@@ -100,6 +103,9 @@ def test_lazy_cum_sum_ordered_by_nulls(
         request.applymarker(pytest.mark.xfail)
     if "polars" in str(constructor) and POLARS_VERSION < (1, 9):
         pytest.skip(reason="too old version")
+    if "cudf" in str(constructor):
+        # https://github.com/rapidsai/cudf/issues/18159
+        request.applymarker(pytest.mark.xfail)
 
     df = nw.from_native(
         constructor(

tests/expr_and_series/rolling_sum_test.py

@@ -136,6 +136,9 @@ def test_rolling_sum_expr_lazy_grouped(
         pytest.skip()
     if any(x in str(constructor) for x in ("dask", "pyarrow_table", "duckdb")):
         request.applymarker(pytest.mark.xfail)
+    if "cudf" in str(constructor) and center:
+        # center is not implemented for offset-based windows
+        request.applymarker(pytest.mark.xfail)
     if "modin" in str(constructor):
         # unreliable
         pytest.skip()

tests/expr_and_series/str/to_datetime_test.py

@@ -219,6 +219,9 @@ def test_to_datetime_tz_aware(
     if "sqlframe" in str(constructor):
         # https://github.com/eakmanrq/sqlframe/issues/325
         request.applymarker(pytest.mark.xfail)
+    if "cudf" in str(constructor):
+        # cuDF does not yet support timezone-aware datetimes
+        request.applymarker(pytest.mark.xfail)
     context = (
         pytest.raises(NotImplementedError)
         if any(x in str(constructor) for x in ("duckdb", "sqlframe")) and format is None

tests/expr_and_series/struct_/field_test.py

@@ -15,9 +15,7 @@ def test_get_field_expr(
     request: pytest.FixtureRequest,
     constructor: Constructor,
 ) -> None:
-    if any(
-        backend in str(constructor) for backend in ("dask", "modin", "cudf", "sqlframe")
-    ):
+    if any(backend in str(constructor) for backend in ("dask", "modin", "sqlframe")):
         request.applymarker(pytest.mark.xfail)
     if "pandas" in str(constructor) and PANDAS_VERSION < (2, 2, 0):
         pytest.skip()
@@ -54,7 +52,7 @@ def test_get_field_series(
     request: pytest.FixtureRequest,
     constructor_eager: ConstructorEager,
 ) -> None:
-    if any(backend in str(constructor_eager) for backend in ("modin", "cudf")):
+    if any(backend in str(constructor_eager) for backend in ("modin",)):
         request.applymarker(pytest.mark.xfail)
     if "pandas" in str(constructor_eager) and PANDAS_VERSION < (2, 2, 0):
         pytest.skip()