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PR#608: tests for handling user groups Merges #608 https://pagure.io/koji/pull-request/608 Fixes: #604 https://pagure.io/koji/issue/604 getGroupMembers API call should raise GenericError exception for non existing groupname Fixes: #607 https://pagure.io/koji/issue/607 dropGroupMember API call should raise GenericError exception for username which is not in group Fixes: #603 https://pagure.io/koji/issue/603 addGroupMember API call should raise GenericError exception for non existing username or groupname