code: def create_test_trailer(is_rapid_scan):
      """Create test trailer for SEVIRI L1.5 product.
  
      Trailer includes mandatory attributes for NativeMSGFileHandler.get_area_extent
      """
      trailer = {
          "15TRAILER": {
              "ImageProductionStats": {
                  "ActualL15CoverageHRV": {
                      "UpperNorthLineActual": 11136,
                      "UpperWestColumnActual": 7533,
                      "UpperSouthLineActual": 8193,
                      "UpperEastColumnActual": 1966,
                      "LowerNorthLineActual": 8192,
                      "LowerWestColumnActual": 5568,
                      "LowerSouthLineActual": 1,
                      "LowerEastColumnActual": 1,
                  },
                  "ActualScanningSummary": {
                      "ReducedScan": is_rapid_scan
                  },
              }
          }
      }
  
      return trailer
  
imports: from __future__ import annotations
  import os
  import unittest
  import warnings
  from datetime import datetime
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  import xarray
  from satpy.readers.eum_base import recarray2dict, time_cds_short
  from satpy.readers.seviri_l1b_native import ASCII_STARTSWITH, ImageBoundaries, NativeMSGFileHandler, Padder, get_available_channels, has_archive_header
  from satpy.tests.reader_tests.test_seviri_base import ORBIT_POLYNOMIALS, ORBIT_POLYNOMIALS_INVALID
  from satpy.tests.reader_tests.test_seviri_l1b_calibration import TestFileHandlerCalibrationBase
  from satpy.tests.utils import assert_attrs_equal, make_dataid
label_desc: Use image node_id 2 for calling a global function with example usage: create_test_trailer(is_rapid_scan) and returns: trailer