code: def reader(l1b_file):
      """Return reader of ATMS level1b data."""
      return AtmsL1bNCFileHandler(
          filename=l1b_file,
          filename_info={
              "creation_time": datetime(2020, 1, 2, 3, 4, 5)
          },
          filetype_info={"antenna_temperature": "antenna_temp"},
      )
  
file_path: satpy/satpy/tests/reader_tests/test_atms_l1b_nc.py
imports: from datetime import datetime
  import numpy
  import pytest
  import xarray
  from satpy.readers.atms_l1b_nc import AtmsL1bNCFileHandler
label_desc: Use image node_id 1 for calling a global function with example usage: reader(l1b_file) and returns: AtmsL1bNCFileHandler