class_docstr: Test VIIRS SDR Reader.
class_docstr_tok: ["Test","VIIRS","SDR","Reader","."]
docstr: Test basic init with start_time being set to the no-date 1/1-1958.
code: def test_init_start_time_is_nodate(self):
      """Test basic init with start_time being set to the no-date 1/1-1958."""
      from satpy.readers import load_reader
  
      r = load_reader(self.reader_configs)
      with pytest.raises(
          ValueError, match="Datetime invalid 1958-01-01 00:00:00"
      ):
          _ = r.create_filehandlers(
              [
                  "SVI01_npp_d19580101_t0000000_e0001261_b01708_c20120226002130255476_noaa_ops.h5",
              ]
          )
  
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 7 for calling the TestVIIRSSDRReader obj's underlying member method code with example usage: obj.test_init_start_time_is_nodate() without return types