code: def testClose(self):
      close_p = D.features(
          D.instruments("csi300"), ["Ref($close, 1)/$close - 1"]
      )
      close_desc = close_p.describe(
          percentiles=np.arange(0.1, 1.0, 0.1)
      )
      print(close_desc)
      self.assertLessEqual(
          abs(close_desc.loc["90%"][0]), 0.1, "Close value is abnormal"
      )
      self.assertLessEqual(
          abs(close_desc.loc["10%"][0]), 0.1, "Close value is abnormal"
      )
  
file_path: qlib/tests/dataset_tests/test_datalayer.py
imports: import unittest
  import numpy
  from qlib.data import D
  from qlib.tests import TestAutoData
label_desc: Use image node_id 2 for calling the TestDataset obj's underlying member method code with example usage: obj.testClose() without return types