code: def _is_fci_test_data(data):
      """Check if we are working with FCI test data."""
      return (
          "sensor" in data.attrs
          and "start_time" in data.attrs
          and data.attrs["sensor"] == "fci"
          and isinstance(data.attrs["start_time"], datetime.datetime)
          and data.attrs["start_time"] < datetime.datetime(2022, 11, 30)
      )
  
file_path: satpy/satpy/enhancements/atmosphere.py
imports: import datetime
  import dask.array
  import xarray
label_desc: Use image node_id 6 for calling a global function with example usage: _is_fci_test_data(data) and returns: unknown