class_docstr: Test the filehandler on a corrupt file.
docstr: Test scanline assignment.
code: def test_read_all_assigns_int_scan_lines(self):
      """Test scanline assignment."""
      self.fh._read_all()
      assert isinstance(self.fh.scanlines, int)
  
imports: import os
  from contextlib import suppress
  from tempfile import mkstemp
  from unittest import TestCase, mock
  import numpy
  import pytest
  import xarray
  import satpy
  from satpy._config import get_config_path
  from satpy.readers import eps_l1b
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 5 for calling the TestWrongScanlinesEPSL1B obj's underlying member method code with example usage: obj.test_read_all_assigns_int_scan_lines() without return types