code: def test_humanize():
      assert naturaldelta(15 * 24 * 60 * 60) == "2 weeks 1 day"
      assert naturaldelta(7 * 24 * 60 * 60) == "1 week"
      assert naturaldelta(7 * 24 * 60 * 60 - 1) == "6 days 23 hours"
      assert (
          naturaldelta(5 * 24 * 60 * 60 + 2 * 60 * 60 + 35 * 60 + 10)
          == "5 days 2 hours"
      )
      assert (
          naturaldelta(1 * 24 * 60 * 60 + 1 * 60 * 60) == "1 day 1 hour"
      )
      assert naturaldelta(1 * 24 * 60 * 60 + 1) == "1 day"
      assert naturaldelta(1 * 24 * 60 * 60) == "1 day"
      assert (
          naturaldelta(1 * 24 * 60 * 60 - 1 * 60)
          == "23 hours 59 minutes"
      )
      assert naturaldelta(1 * 24 * 60 * 60 - 1) == "23 hours 59 minutes"
      assert (
          naturaldelta(2 * 60 * 60 + 35 * 60 + 10)
          == "2 hours 35 minutes"
      )
      assert naturaldelta(1 * 60 * 60) == "1 hour"
      assert naturaldelta(200) == "3 minutes 20s"
      assert naturaldelta(120) == "2 minutes"
      assert naturaldelta(119) == "1 minute 59s"
      assert naturaldelta(60) == "1 minute"
      assert naturaldelta(59) == "59s"
      assert naturaldelta(1) == "1s"
      assert naturaldelta(1.5) == "1s 500ms"
      assert naturaldelta(0.001) == "1ms"
      assert naturaldelta(0.000001) == "1μs"
  
      assert (
          naturaldelta_msec(15 * 24 * 60 * 60 * 1000) == "2 weeks 1 day"
      )
      assert naturaldelta_msec(200_000) == "3 minutes 20s"
      assert naturaldelta_msec(120_000) == "2 minutes"
      assert naturaldelta_msec(119_000) == "1 minute 59s"
      assert naturaldelta_msec(60_500) == "1 minute"
      assert naturaldelta_msec(60_000) == "1 minute"
      assert naturaldelta_msec(59_500) == "59s 500ms"
      assert naturaldelta_msec(59_000) == "59s"
      assert naturaldelta_msec(57_123) == "57s 123ms"
      assert naturaldelta_msec(1_999) == "1s 999ms"
      assert naturaldelta_msec(1_001) == "1s 1ms"
      assert naturaldelta_msec(1_000) == "1s"
      assert naturaldelta_msec(999) == "999ms"
      assert naturaldelta_msec(999.5) == "999ms 500μs"
      assert naturaldelta_msec(500.123) == "500ms 123μs"
      assert naturaldelta_msec(1) == "1ms"
      assert naturaldelta_msec(0.001) == "1μs"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_humanize() without return types