code: def test_0_qlib_data(self):
      GetData().qlib_data(
          name="qlib_data_simple",
          target_dir=QLIB_DIR,
          region="cn",
          interval="1d",
          delete_old=False,
          exists_skip=True,
      )
      df = D.features(D.instruments("csi300"), self.FIELDS)
      self.assertListEqual(
          list(df.columns), self.FIELDS, "get qlib data failed"
      )
      self.assertFalse(df.dropna().empty, "get qlib data failed")
  
file_path: qlib/tests/test_get_data.py
imports: import shutil
  import unittest
  from pathlib import Path
  import qlib
  from qlib.data import D
  from qlib.tests.data import GetData
label_desc: Use image node_id 3 for calling the TestGetData obj's underlying member method code with example usage: obj.test_0_qlib_data() without return types