def METHOD_NAME(self):
    self.journal.n43_date_type = "fecha_oper"
    action = self.import_wizard.import_file_button()
    self.assertTrue(action)
    statements = self.env["account.bank.statement.line"].search(
        [("statement_id.journal_id", "=", self.journal.id)]
    )
    self.assertEqual(statements[0].date, fields.Date.to_date("2016-05-26"))