o Fix tests for other readers

Author: rajeeja

test/grid/grid/test_initialization.py

@@ -49,7 +49,7 @@ def test_grid_init_verts_fill_values():
 def test_read_shpfile(test_data_dir):
     """Reads a shape file and write ugrid file."""
     shp_filename = test_data_dir / "shp" / "grid_fire.shp"
-    with pytest.raises(ValueError):
+    with pytest.raises((ValueError, FileNotFoundError, OSError)):
         grid_shp = ux.open_grid(shp_filename)
 
 

uxarray/core/utils.py

@@ -28,21 +28,14 @@ def _open_dataset_with_fallback(filename_or_obj, chunks=None, **kwargs):
     xr.Dataset
         The opened dataset
     """
-    # First attempt: use xarray's default read engine
-    original_error = None
     try:
+        # Try opening with xarray's default read engine
         return xr.open_dataset(filename_or_obj, chunks=chunks, **kwargs)
-    except Exception as e:
-        original_error = e
-
-    # Second attempt: fallback to netcdf4 engine
-    try:
+    except Exception:
+        # If it fails, use the "netcdf4" engine as backup
         # Extract engine from kwargs to prevent duplicate parameter error
         engine = kwargs.pop("engine", "netcdf4")
         return xr.open_dataset(filename_or_obj, engine=engine, chunks=chunks, **kwargs)
-    except Exception:
-        # If both attempts fail, raise the original error to preserve behavior
-        raise original_error
 
 
 def _map_dims_to_ugrid(