set default buffert to 0.5 including test (#1009)

dfm_tools/download.py

@@ -351,8 +351,8 @@ def copernicusmarine_get_buffer(dataset_id):
  resolution = ds.latitude.attrs["step"]
  buffer = 2 * resolution
  except (AttributeError, KeyError, TypeError):
- print("failed to automatically derive a buffer from the dataset, using buffer=0")
- buffer = 0
+ print("failed to automatically derive a buffer from the dataset, using buffer=0.5")
+ buffer = 0.5
  return buffer
 
 

tests/test_download.py

@@ -14,6 +14,7 @@
  cds_set_credentials_rcfile,
  cds_remove_credentials_raise,
  copernicusmarine_credentials,
+ copernicusmarine_get_buffer,
  )
 import dfm_tools as dfmt
 import xarray as xr
@@ -165,6 +166,14 @@ def test_copernicusmarine_credentials():
  copernicusmarine_credentials()
 
 
+@pytest.mark.requiressecrets
+@pytest.mark.unittest
+def test_copernicusmarine_get_buffer_notfound():
+ dataset_id = 'cmems_obs-oc_glo_bgc-transp_my_l3-multi-4km_P1D'
+ buffer = copernicusmarine_get_buffer(dataset_id)
+ assert buffer == 0.5
+
+
 @pytest.mark.requiressecrets
 @pytest.mark.unittest
 def test_download_cmems_my(tmp_path):