code: def test_flatten_unique():
      l = [[1, 2], [1, 3, 4], [5]]
      assert flatten_unique(l) == [1, 2, 3, 4, 5]
  
imports: from Adversary.utils import *
label_desc: Use image node_id 1 for calling a global function with example usage: test_flatten_unique() without return types