code: def get_attrs_exp(projection_longitude=0.0):
      """Get expected dataset attributes."""
      return {
          "units": "units",
          "wavelength": "wavelength",
          "standard_name": "standard_name",
          "platform_name": "Meteosat-11",
          "sensor": "seviri",
          "orbital_parameters": {
              "projection_longitude": projection_longitude,
              "projection_latitude": 0.0,
              "projection_altitude": 35785831.0,
              "satellite_nominal_longitude": -3.5,
              "satellite_nominal_latitude": 0.0,
              "satellite_actual_longitude": -3.55117540817073,
              "satellite_actual_latitude": -0.5711243456528018,
              "satellite_actual_altitude": 35783296.150123544,
          },
          "georef_offset_corrected": True,
          "nominal_start_time": (datetime(2006, 1, 1, 12, 15),),
          "nominal_end_time": (datetime(2006, 1, 1, 12, 30),),
          "time_parameters": {
              "nominal_start_time": datetime(2006, 1, 1, 12, 15),
              "nominal_end_time": datetime(2006, 1, 1, 12, 30),
              "observation_start_time": datetime(
                  2006, 1, 1, 12, 15, 9, 304888
              ),
              "observation_end_time": datetime(
                  2006, 1, 1, 12, 27, 39, 0
              ),
          },
      }
  
file_path: satpy/satpy/tests/reader_tests/test_seviri_l1b_hrit_setup.py
imports: from datetime import datetime
  from unittest import mock
  import numpy
  from satpy.readers.seviri_l1b_hrit import HRITMSGFileHandler, HRITMSGPrologueFileHandler
  from satpy.tests.reader_tests.test_seviri_base import ORBIT_POLYNOMIALS
label_desc: Use image node_id 11 for calling a global function with example usage: get_attrs_exp(projection_longitude) and returns: dict