code: def test_format_runtime_string(self, raw_seconds, expected):
      self.assertEqual(
          expected,
          runtime_by_region_vis.format_runtime_string(raw_seconds),
      )
  
imports: import io
  from absl.testing import absltest
  from absl.testing import parameterized
  import pandas
  from deepvariant import runtime_by_region_vis
  from deepvariant import testdata
label_desc: Use image node_id 2 for calling the RuntimeByRegionVisTest obj's underlying member method code with example usage: obj.test_format_runtime_string(raw_seconds, expected) without return types