Fixes problem with crop-tgrid

The function xr_crop_tgrid_data was failing tests. The issue has been identified and fixed. This implements the fix from !25.

pyicon/tests/conftest.py

-import pytest
 from pathlib import Path
+import pytest
 import xarray as xr
 import pyicon as pyic
 
+
 @pytest.fixture()
-def raw_grid():
-    cur_dir = Path(__file__).parent.resolve()
-    grid_path = cur_dir / "test_data/icon_grid_0014_R02B04_O.nc"
+def lazy_raw_grid():
+    path_data = Path(pyic.params['path_example_data'])
+    path_data.mkdir(parents=True, exist_ok=True)
+    grid_path = path_data / "icon_grid_0014_R02B04_O.nc"
 
     if not grid_path.exists():
         import requests
@@ -19,37 +21,57 @@ def raw_grid():
             raise FileNotFoundError("{grid_path} does not exist and unable to \
                 download it")
 
-    ds_grid = xr.open_dataset(grid_path)
+    ds_grid = xr.open_dataset(grid_path, chunks="auto")
     return ds_grid
 
 
 @pytest.fixture()
-def processed_tgrid(raw_grid):
-    return pyic.convert_tgrid_data(raw_grid)
+def eager_raw_grid(lazy_raw_grid):
+    ds_raw_grid = lazy_raw_grid.compute()
+    return ds_raw_grid
+
+
+@pytest.fixture()
+def lazy_processed_tgrid(lazy_raw_grid):
+    return pyic.convert_tgrid_data(lazy_raw_grid)
+
+
+@pytest.fixture()
+def eager_processed_tgrid(eager_raw_grid):
+    return pyic.convert_tgrid_data(eager_raw_grid)
+
 
 @pytest.fixture()
-def examp_icon_dataset():
-    #cur_dir = Path(__file__).parent.resolve()
-    #fpath_data = cur_dir / "test_data/icon_example_data_r2b6.nc"
+def lazy_examp_icon_dataset():
     path_data = Path(pyic.params['path_example_data'])
     path_data.mkdir(parents=True, exist_ok=True)
     fpath_data = path_data / "icon_example_data_r2b4.nc"
 
     if not fpath_data.exists():
         import requests
-        download_link = "https://swift.dkrz.de/v1/dkrz_07387162e5cd4c81b1376bd7c648bb60/pyicon_example_data/icon_example_data_r2b4.nc"
+        download_link = "https://swift.dkrz.de/v1/dkrz_83018ad4-3c8d-4c7d-b684-7ba0742caa1a/pyicon_test_data/icon_example_data_r2b4.nc?temp_url_sig=03fb5d20a44832c7cf736ab83c1be3936364dbf6&temp_url_expires=2026-11-24T11:53:16Z"
         try:
-            r = requests.get(download_link, allow_redirects=True)
+            r = requests.get(download_link, allow_redirects=True, stream=True)
             with open(fpath_data, "wb") as fobj:
                 fobj.write(r.content)
         except:
             raise FileNotFoundError("{fpath_data} does not exist and unable to \
                 download it")
 
-    ds = xr.open_dataset(fpath_data)
+    ds = xr.open_dataset(fpath_data, chunks="auto")
     return ds
 
+
 @pytest.fixture()
-def examp_icon_dataarray(examp_icon_dataset):
-    return examp_icon_dataset["to"]
+def eager_examp_icon_dataset(lazy_examp_icon_dataset):
+    return lazy_examp_icon_dataset.compute()
+
 
+@pytest.fixture()
+def lazy_examp_icon_dataarray(lazy_examp_icon_dataset):
+    return lazy_examp_icon_dataset["to"]
+
+
+@pytest.fixture()
+def eager_examp_icon_dataarray(eager_examp_icon_dataset):
+    return eager_examp_icon_dataset["to"]