def METHOD_NAME(self):
    """Should quickly produce expected data, and find large input sheet dimensions."""
    self.maxDiff = None
    # Test fixture produced by adding data at cells IV1 and A19999.
    xls_path = os.path.join(bug_example_xls.PATH, "extra_columns.xls")
    before = datetime.utcnow()
    xls_data = xls_to_dict(xls_path)
    after = datetime.utcnow()
    self.assertLess((after - before).total_seconds(), 5)
    wb = xlrd.open_workbook(filename=xls_path)
    survey_headers = [
        "type",
        "name",
        "label",
    ]
    self.assertEqual(survey_headers, list(xls_data["survey_header"][0].keys()))
    self.assertEqual(3, len(xls_data["survey"]))
    self.assertEqual("b", xls_data["survey"][2]["name"])
    survey = wb["survey"]
    self.assertTupleEqual((19999, 256), (survey.nrows, survey.ncols))
    wb.release_resources()