code: def test_init(self):
      x = cellprofiler_core.image.ImageSetList()
      assert (
          x.count() == 0
      ), "# of elements of an empty image set list is %d, not zero" % (
          x.count()
      )
  
file_path: CellProfiler/tests/core/image/test_image_set_list.py
imports: import numpy
  import cellprofiler_core.image
  import cellprofiler_core.image.abstract_image._callback_image
label_desc: Use image node_id 1 for calling the TestImageSetList obj's underlying member method code with example usage: obj.test_init() without return types