code: def _get_shared_global_attrs(filename):
      attrs = {
          "time_coverage_start": "2020-08-12T05:58:31.0Z",
          "time_coverage_end": "2020-08-12T06:07:01.0Z",
          "platform_name": "GCOM-W1",
          "instrument_name": "AMSR2",
      }
      return attrs
  
file_path: satpy/satpy/tests/reader_tests/test_amsr2_l2_gaasp.py
imports: import os
  from datetime import datetime
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  import xarray
label_desc: Use image node_id 1 for calling a global function with example usage: _get_shared_global_attrs(filename) and returns: attrs