code: def test_from_xls_default(self):
      xls = pd.ExcelFile(
          "graphistry/tests/data/NodeXLWorkbook-220237-twitter.xlsx",
          engine="openpyxl",
      )
      nodes_df = pd.read_excel(xls, "Vertices")
      edges_df = pd.read_excel(xls, "Edges")
      g = graphistry.nodexl(xls)
      self.assertEqual(len(g._nodes), len(nodes_df) - 1)
      self.assertEqual(len(g._edges), len(edges_df) - 1)
      self.assertEqual(g._node, "Vertex")
      self.assertEqual(g._source, "Vertex 1")
      self.assertEqual(g._destination, "Vertex 2")
      assert g._nodes["Color2"].dtype.name == "int32"
      assert g._edges["ColorInt"].dtype.name == "int32"
      assert g._edge_title is None
  
imports: import pandas
  import graphistry
  from common import NoAuthTestCase
label_desc: Use image node_id 1 for calling the TestNodexlBindings obj's underlying member method code with example usage: obj.test_from_xls_default() without return types