code: def test_get_dependencies_nothing():
      with pytest.raises(ValueError):
          get_dependencies({})
  
imports: import pickle
  from collections import namedtuple
  import pytest
  from flash.core.serve.dag.task import flatten, get, get_dependencies, get_deps, istask, literal, preorder_traversal, quote, subs
  from flash.core.serve.dag.utils_test import add, inc
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 8 for calling a global function with example usage: test_get_dependencies_nothing() without return types