class_docstr: Test reading a single CLAAS2 file.
class_docstr_tok: ["Test","reading","a","single","CLAAS2","file","."]
docstr: Get expected area extent.
docstr_tok: ["Get","expected","area","extent","."]
code: def area_extent_exp(self, start_time):
      """Get expected area extent."""
      if start_time < datetime.datetime(2017, 12, 6):
          return (
              -5454733.160460291,
              -5454733.160460292,
              5454733.160460292,
              5454733.160460291,
          )
      return (
          -5456233.362099582,
          -5453232.958821001,
          5453232.958821001,
          5456233.362099582,
      )
  
imports: import datetime
  import os
  import numpy
  import pytest
  import xarray
  from pyresample.geometry import AreaDefinition
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 2 for calling the TestCLAAS2SingleFile obj's underlying member method code with example usage: obj.area_extent_exp(start_time) and returns: unknown,  unknown,  int,  int, unknown,  unknown,  int,  int