Fixture for creating a published collection

[mih]

This was first introduced in #212, but used the dataverse_collection, hence turned all collections into published collections. The following patch is a sketch of a fixture that creates a dedicated/separate published collection.

diff --git a/datalad_dataverse/tests/fixtures.py b/datalad_dataverse/tests/fixtures.py
index dceda34..6c554f4 100644
--- a/datalad_dataverse/tests/fixtures.py
+++ b/datalad_dataverse/tests/fixtures.py
@@ -78,24 +78,32 @@ def dataverse_collection(dataverse_admin_api,
 
 
 @pytest.fixture(autouse=False, scope='session')
-def dataverse_published_collection(dataverse_admin_api, dataverse_collection):
+def dataverse_published_collection(dataverse_admin_api,
+                                   dataverse_demoinstance_url,
+                                   dataverse_instance_url):
     # This may not work in all test setups due to lack of permissions or /root
-    # not being published or it being published already. Try though, since it's
-    # necessary to publish datasets in order to test against dataverse datasets
-    # with several versions.
-    from pyDataverse.exceptions import (
-        ApiAuthorizationError,
-        OperationFailedError,
+    # not being published or it being published already.
+    from uuid import uuid1
+    # very much like a non-published collection
+    base_collection = 'demo' \
+        if dataverse_instance_url == dataverse_demoinstance_url else 'root'
+
+    collection_alias = f'dvpub-{uuid1()}'
+
+    create_test_dataverse_collection(
+        dataverse_admin_api,
+        collection_alias,
+        collection=base_collection,
     )
+
     try:
-        dataverse_admin_api.publish_dataverse(dataverse_collection)
-    except ApiAuthorizationError:
-        # Test setup doesn't allow for it
-        pass
-    except OperationFailedError as e:
-        print(str(e))
+        dataverse_admin_api.publish_dataverse(collection_alias)
+    except Exception as e:
+        pytest.skip(f'Could not publish a dataverse collection: {str(e)}')
 
-    yield dataverse_collection
+    yield collection_alias
+
+    dataverse_admin_api.delete_dataverse(collection_alias)

Given that a cleanup of such test artifacts requires superuser permissions, the fixture must also test/ensure the availability of such permissions, or skip a test.