class_docstr: Test the Scene object's `.load` method for composites.
class_docstr_tok: ["Test","the","Scene","object","'s","`",".load","`","method","for","composites","."]
docstr: Test dependency tree if too many reader keys match.
code: def test_load_too_many(self):
      """Test dependency tree if too many reader keys match."""
      scene = Scene(filenames=["fake3_1.txt"], reader="fake3")
      avail_comps = scene.available_composite_ids()
      # static image => 1
      assert len(avail_comps) == 1
      pytest.raises(KeyError, scene.load, [0.21])
  
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 20 for calling the TestLoadingComposites obj's underlying member method code with example usage: obj.test_load_too_many() without return types