code: def test_zeros():
      """Test IdentifyTertiarySubregion on an empty image"""
      primary_labels = numpy.zeros((10, 10), int)
      secondary_labels = numpy.zeros((10, 10), int)
      workspace = make_workspace(primary_labels, secondary_labels)
      module = workspace.module
      module.run(workspace)
      measurements = workspace.measurements
      assert "Image" in measurements.get_object_names()
      count_feature = "Count_%s" % TERTIARY
      assert count_feature in measurements.get_feature_names("Image")
      value = measurements.get_current_measurement(
          "Image", count_feature
      )
      assert numpy.product(value.shape) == 1
      assert value == 0
      assert TERTIARY in workspace.object_set.get_object_names()
      output_objects = workspace.object_set.get_objects(TERTIARY)
      assert numpy.all(output_objects.segmented == primary_labels)
      columns = module.get_measurement_columns(workspace.pipeline)
      for object_name in (
          "Image",
          PRIMARY,
          SECONDARY,
          TERTIARY,
      ):
          ocolumns = [x for x in columns if x[0] == object_name]
          features = measurements.get_feature_names(object_name)
          assert len(ocolumns) == len(features)
          assert all([column[1] in features for column in ocolumns])
  
imports: import numpy
  import six.moves
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  import cellprofiler_core.measurement
  import cellprofiler_core.modules
  from cellprofiler_core.constants.measurement import FF_COUNT, COLTYPE_INTEGER, M_LOCATION_CENTER_X, COLTYPE_FLOAT, M_LOCATION_CENTER_Y, M_NUMBER_OBJECT_NUMBER, FF_CHILDREN_COUNT, FF_PARENT, R_FIRST_IMAGE_NUMBER, R_SECOND_IMAGE_NUMBER, R_FIRST_OBJECT_NUMBER, R_SECOND_OBJECT_NUMBER
  import cellprofiler.modules.identifytertiaryobjects
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.workspace
  import tests.frontend.modules
label_desc: Use image node_id 3 for calling a global function with example usage: test_zeros() without return types