old_contents: class MockRpc:
      def validateaddress(self, address):
          data = {"account": "reddit-just-an-dev", "ismine": 'true', "isvalid": 'true', "iscompressed": 'true',
                  "isscript": 'false', "iswatchonly": 'false', "address": "nnz4zsVZtpngPVmARnvzBS79DwV6k7vRvS",
                  "pubkey": "02cacc9e6cfcbb0b2a23569838ad908193a9a1456911fe45c4fff7f9daa06b8809",
                  "scriptPubKey": "76a914ce2100bf6580b586dba3c0d2df0f2196940d2f4588ac"}
          return data
  
new_contents: class MockRpc:
      def validateaddress(self, address):
          data = {"account": "reddit-just-an-dev", "ismine": 'true', "isvalid": 'true', "iscompressed": 'true',
                  "isscript": 'false', "iswatchonly": 'false', "address": "nnz4zsVZtpngPVmARnvzBS79DwV6k7vRvS",
                  "pubkey": "02cacc9e6cfcbb0b2a23569838ad908193a9a1456911fe45c4fff7f9daa06b8809",
                  "scriptPubKey": "76a914ce2100bf6580b586dba3c0d2df0f2196940d2f4588ac"}
          return data
  
      def getnewaddress(self, account=None):
          data = "nnBKn39onxAuS1cr6KuLAoV2SdfFh1dpsR"
          return data
  
subject: add getnewaddress to mock rpc