code: def test_format_time(self):
      tests = (
          (1.2473e-8, "0.0ns"),
          (1.2473e-7, "0.1ns"),
          (1.2473e-6, "1.2ns"),
          (0.000_012_473, "12.5ns"),
          (0.000_124_73, "124.7ns"),
          (0.001_247_3, "1.2ms"),
          (0.012_473, "12.5ms"),
          (0.12473, "124.7ms"),
          (1.2473, "1.2s"),
          (12.473, "12.5s"),
          (124.73, "2m5s"),
          (1247.3, "20m47s"),
          (12473.0, "3h28m"),
          (124_730.0, "1d11h"),
          (1_247_300.0, "14d10h"),
      )
      for seconds, expected in tests:
          self.assertEqual(
              expected,
              timing.format_time(seconds),
              f"Failed to format {seconds}",
          )
  
imports: import unittest
  from pytext.utils import timing
label_desc: Use image node_id 1 for calling the TimingTest obj's underlying member method code with example usage: obj.test_format_time() without return types