code: def test_au_init_plain(self):
      au = ArrowUploader()
      with pytest.raises(Exception):
          au.token
      with pytest.raises(Exception):
          au.dataset_id
      assert au.edges is None
      assert au.nodes is None
      assert au.node_encodings == {"bindings": {}}
      assert au.edge_encodings == {"bindings": {}}
      assert len(au.name) > 0
      assert not (au.metadata is None)
  
imports: import graphistry, mock, pandas, pytest, unittest
  from graphistry import ArrowUploader
  from graphistry.pygraphistry import PyGraphistry
label_desc: Use image node_id 1 for calling the TestArrowUploader_Core obj's underlying member method code with example usage: obj.test_au_init_plain() without return types