tests: introduce ConnectionTimeoutWarning to reduce warnings

CHANGELOG

@@ -3,6 +3,7 @@
    used by any other piece of software and because combining file-like
    objects external links are quirky and their combination finally broke with h5py 3.12
  - enh: added integrity check for external links
+ - tests: reduce warnings
 0.61.5
  - fix: integrity check failed for empty datasets
 0.61.4

dclab/http_utils.py

@@ -31,6 +31,10 @@ class ETagNotInResponseHeaderWarning(UserWarning):
     """Used for cases where the requests.Response does not contain an ETag"""
 
 
+class ConnectionTimeoutWarning(UserWarning):
+    """Used when a connection fails or times out"""
+
+
 class HTTPFile(io.IOBase):
     def __init__(self, url, chunk_size=2**18, keep_chunks=200):
         """Chunk-cached access to a URL supporting range requests
@@ -243,7 +247,8 @@ def get(self, *args, **kwargs):
                     requests.exceptions.ConnectTimeout,
                     requests.urllib3.exceptions.ConnectionError,
                     requests.urllib3.exceptions.ReadTimeoutError) as e:
-                warnings.warn(f"Encountered {e} for {args} {kwargs}")
+                warnings.warn(f"Encountered {e} for {args} {kwargs}",
+                              ConnectionTimeoutWarning)
                 continue
             else:
                 break

tests/test_rtdc_fmt_dcor_basin.py

@@ -71,6 +71,8 @@ def test_basin_as_dict(tmp_path):
     "https://example.com/nonexistentbucket/nonexistentkey",
     f"https://objectstore.hpccloud.mpcdf.mpg.de/noexist-{uuid.uuid4()}/key",
 ])
+@pytest.mark.filterwarnings(
+    "ignore::dclab.http_utils.ConnectionTimeoutWarning")
 def test_basin_not_available(url):
     h5path = retrieve_data("fmt-hdf5_fl_wide-channel_2023.zip")