code: def test_get_vn_dataset_reflectances(sgli_vn_file):
      """Test that the vn datasets can be calibrated to reflectances."""
      handler = HDF5SGLI(sgli_vn_file, {"resolution": "L"}, {})
      did = dict(
          name="VN1",
          resolution=1000,
          polarization=None,
          calibration="reflectance",
      )
      res = handler.get_dataset(
          did,
          {
              "file_key": "Image_data/Lt_VN01",
              "units": "%",
              "standard_name": "",
          },
      )
      assert np.allclose(
          res[0, :] / 100, FULL_KM_ARRAY[0, :] * 5e-5 - 0.05
      )
      assert res.dtype == np.float32
      assert res.dims == ("y", "x")
      assert res.attrs["units"] == "%"
  
imports: import sys
  from datetime import datetime, timedelta
  import dask
  import h5py
  import numpy
  import pytest
  from satpy.readers.sgli_l1b import HDF5SGLI
label_desc: Use image node_id 9 for calling a global function with example usage: test_get_vn_dataset_reflectances(sgli_vn_file) without return types