class_docstr: Test reading multiple CLAAS-2 files.
class_docstr_tok: ["Test","reading","multiple","CLAAS-2","files","."]
docstr: Test number of datasets.
docstr_tok: ["Test","number","of","datasets","."]
code: def test_number_of_datasets(self, multi_file_dataset):
      """Test number of datasets."""
      assert 2 == len(multi_file_dataset)
  
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 5 for calling the TestCLAAS2MultiFile obj's underlying member method code with example usage: obj.test_number_of_datasets(multi_file_dataset) without return types