code: def test_list_interface_len():
      l = DogmaticList()
      assert len(l) == 0
      l = DogmaticList([0, 1, 2])
      assert len(l) == 3
  
imports: import pytest
  from sacred.config.custom_containers import DogmaticDict, DogmaticList
label_desc: Use image node_id 16 for calling a global function with example usage: test_list_interface_len() without return types