code: def test_table_infer_valid_date(self):
      data = {"a": [None, None, None, None, None, None, "08/31/2019"]}
      tbl = Table(data)
      assert tbl.schema() == {"a": date}
  
imports: from datetime import date, datetime
  from perspective.table import Table
  from pytest import mark
label_desc: Use image node_id 11 for calling the TestTableInfer obj's underlying member method code with example usage: obj.test_table_infer_valid_date() without return types