code: def test_output(single_with_trials):
      """Test that output is used properly"""
  
      output = "custom"
      filename = f"{output}.png"
      with AssertNewFile(filename):
          returncode = orion.core.cli.main(
              [
                  "plot",
                  "regret",
                  "--name",
                  "test_single_exp",
                  "--output",
                  output,
              ]
          )
          assert returncode == 0
  
imports: import random
  import pytest
  import orion.core.cli
  import orion.plotting.backend_plotly
  from orion.core.cli.plot import IMAGE_TYPES, VALID_TYPES
  from orion.plotting.base import SINGLE_EXPERIMENT_PLOTS
  from orion.storage.base import setup_storage
  from orion.testing import AssertNewFile
label_desc: Use image node_id 8 for calling a global function with example usage: test_output(single_with_trials) without return types