code: def test_table_infer_datetime_tz(self):
      data = {
          "a": [
              None,
              None,
              None,
              None,
              None,
              "2019-07-25T09:00:00-05:00",
          ]
      }
      tbl = Table(data)
      assert tbl.schema() == {"a": datetime}
  
imports: from datetime import date, datetime
  from perspective.table import Table
  from pytest import mark
label_desc: Use image node_id 20 for calling the TestTableInfer obj's underlying member method code with example usage: obj.test_table_infer_datetime_tz() without return types