coverage

narwhals/_dask/group_by.py

@@ -51,7 +51,7 @@ def var(
 
     try:
         import dask.dataframe.dask_expr as dx
-    except ModuleNotFoundError:
+    except ModuleNotFoundError:  # pragma: no cover
         import dask_expr as dx
 
     return partial(dx._groupby.GroupBy.var, ddof=ddof)
@@ -67,7 +67,7 @@ def std(
     try:
         import dask.dataframe.dask_expr as dx
     except ModuleNotFoundError:
-        import dask_expr as dx
+        import dask_expr as dx  # pragma: no cover
 
     return partial(dx._groupby.GroupBy.std, ddof=ddof)
 

narwhals/_dask/utils.py

@@ -89,7 +89,7 @@ def add_row_index(
 def validate_comparand(lhs: dx.Series, rhs: dx.Series) -> None:
     try:
         import dask.dataframe.dask_expr as dx
-    except ModuleNotFoundError:
+    except ModuleNotFoundError:  # pragma: no cover
         import dask_expr as dx
 
     if not dx._expr.are_co_aligned(lhs._expr, rhs._expr):  # pragma: no cover

narwhals/dependencies.py

@@ -92,7 +92,7 @@ def get_ibis() -> Any:
     return sys.modules.get("ibis", None)
 
 
-def get_dask_expr() -> Any:
+def get_dask_expr() -> Any:  # pragma: no cover
     """Get dask_expr module (if already imported - else return None)."""
     return sys.modules.get("dask_expr", None)
 

tests/tpch_q1_test.py

@@ -31,7 +31,6 @@ def test_q1(library: str, request: pytest.FixtureRequest) -> None:
         df_raw = pl.scan_csv("tests/data/lineitem.csv")
     elif library == "dask":
         pytest.importorskip("dask")
-        pytest.importorskip("dask_expr", exc_type=ImportError)
         import dask.dataframe as dd
 
         df_raw = dd.from_pandas(