The DOI specified initially for DataCite is not in DataCite anymore, but in Crossref. See:
# Do not use support files, only APIs
df_1 = DataCiteResourceFinder()
self.assertIn("2197-6775", df_1.get_container_issn("10.14763/2019.1.1389"))
self.assertNotIn("1588-2861", df_1.get_container_issn("10.14763/2019.1.1389"))
Action item: use another DOI currently in DataCite.
The DOI specified initially for DataCite is not in DataCite anymore, but in Crossref. See:
Action item: use another DOI currently in DataCite.