class_docstr: Test the Scene object's `.load` method for datasets coming from a reader.
class_docstr_tok: ["Test","the","Scene","object","'s","`",".load","`","method","for","datasets","coming","from","a","reader","."]
docstr: Test loading one dataset with no loaded compositors.
code: def test_load_ds1_unknown_modifier(self):
      """Test loading one dataset with no loaded compositors."""
      scene = Scene(filenames=["fake1_1.txt"], reader="fake1")
      pytest.raises(
          KeyError,
          scene.load,
          [make_dataid(name="ds1", modifiers=("_fake_bad_mod_",))],
      )
  
imports: from unittest import mock
  import pytest
  import xarray
  from dask import array
  from satpy import Scene
  from satpy.tests.utils import make_cid, make_dataid, make_dsq, spy_decorator
label_desc: Use image node_id 4 for calling the TestLoadingReaderDatasets obj's underlying member method code with example usage: obj.test_load_ds1_unknown_modifier() without return types