class_docstr: Test VIIRS SDR Reader.
class_docstr_tok: ["Test","VIIRS","SDR","Reader","."]
docstr: Load I01 when only DNB files are provided.
code: def test_load_i_no_files(self):
      """Load I01 when only DNB files are provided."""
      from satpy.readers import load_reader
  
      r = load_reader(self.reader_configs)
      loadables = r.select_files_from_pathnames(
          [
              "SVDNB_npp_d20120225_t1801245_e1802487_b01708_c20120226002130255476_noaa_ops.h5",
              "GDNBO_npp_d20120225_t1801245_e1802487_b01708_c20120226002130255476_noaa_ops.h5",
          ]
      )
      r.create_filehandlers(loadables)
      assert "I01" not in [x["name"] for x in r.available_dataset_ids]
      ds = r.load(["I01"])
      assert len(ds) == 0
  
imports: import os
  import unittest
  from contextlib import contextmanager
  from unittest import mock
  import numpy
  import pytest
  from satpy.readers.viirs_atms_sdr_base import DATASET_KEYS
  from satpy.tests.reader_tests.test_hdf5_utils import FakeHDF5FileHandler
label_desc: Use image node_id 21 for calling the TestVIIRSSDRReader obj's underlying member method code with example usage: obj.test_load_i_no_files() without return types