class_docstr: Test the SAFE GRD file handler.
class_docstr_tok: ["Test","the","SAFE","GRD","file","handler","."]
docstr: Test initialization of file handlers.
docstr_tok: ["Test","initialization","of","file","handlers","."]
code: def test_instantiate(self):
      """Test initialization of file handlers."""
      assert self.test_fh._polarization == "vv"
      assert self.test_fh.calibration == self.calfh
      assert self.test_fh.noise == self.noisefh
      self.mocked_rio_open.assert_called()
  
imports: import unittest
  import unittest.mock
  from enum import Enum
  from io import BytesIO
  import dask.array
  import numpy
  import xarray
  from satpy.dataset import DataQuery
  from satpy.readers.sar_c_safe import SAFEXMLAnnotation, SAFEXMLCalibration, SAFEXMLNoise
label_desc: Use image node_id 2 for calling the TestSAFEGRD obj's underlying member method code with example usage: obj.test_instantiate() without return types