pabloem commented on a change in pull request #12331:
URL: https://github.com/apache/beam/pull/12331#discussion_r463788480



##########
File path: sdks/python/apache_beam/io/gcp/dicomio.py
##########
@@ -167,33 +167,40 @@ class DicomSearch(PTransform):
     }
 
   """
-  def __init__(self, buffer_size=8, max_workers=5, credential=None):
+  def __init__(
+      self, buffer_size=8, max_workers=5, client=None, credential=None):
     """Initializes DicomSearch.
     Args:
       credential: # type: Google credential object, if it is specified, the
       Http client will use it to create sessions instead of the default.
     """
     self.buffer_size = buffer_size
     self.max_workers = max_workers
+    if not client:
+      self.client = DicomApiHttpClient()
+    else:
+      self.client = client

Review comment:
       it's not that important, but you can do `self.client = client or 
DicomApiHttpClient()`
   
   Feel free to add it if you have the time.

##########
File path: sdks/python/setup.py
##########
@@ -128,6 +128,7 @@ def get_version():
   cythonize = lambda *args, **kwargs: []
 
 REQUIRED_PACKAGES = [
+    'google-auth>=1.18.0,<=1.20.0',

Review comment:
       ah that's right. You need to skip the test when GCP dependencies are 
missing. Check how we do it for gcs filesystem:
   
   
https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py#L39-L47




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