test: catch some cudf failures (#1735)

pyproject.toml

@@ -187,6 +187,7 @@ omit = [
 exclude_also = [
   "if sys.version_info() <",
   "if .*implementation is Implementation.CUDF",
+  "if .*implementation.is_cudf",
   'request.applymarker\(pytest.mark.xfail',
   'backend_version <',
   'if "cudf" in str\(constructor'

tests/expr_and_series/clip_test.py

@@ -28,6 +28,9 @@ def test_clip_expr_expressified(
 ) -> None:
     if "modin_pyarrow" in str(constructor):
         request.applymarker(pytest.mark.xfail)
+    if "cudf" in str(constructor):
+        # https://github.com/rapidsai/cudf/issues/17682
+        request.applymarker(pytest.mark.xfail)
 
     data = {"a": [1, 2, 3, -4, 5], "lb": [3, 2, 1, 1, 1], "ub": [4, 4, 2, 2, 2]}
     df = nw.from_native(constructor(data))

tests/expr_and_series/lit_test.py

@@ -108,4 +108,8 @@ def test_date_lit(constructor: Constructor, request: pytest.FixtureRequest) -> N
         request.applymarker(pytest.mark.xfail)
     df = nw.from_native(constructor({"a": [1]}))
     result = df.with_columns(nw.lit(date(2020, 1, 1), dtype=nw.Date)).collect_schema()
-    assert result == {"a": nw.Int64, "literal": nw.Date}
+    if df.implementation.is_cudf():
+        # cudf has no date dtype
+        assert result == {"a": nw.Int64, "literal": nw.Datetime}
+    else:
+        assert result == {"a": nw.Int64, "literal": nw.Date}