code: def test_normal_sizes(self):
      self.assertEqual("1.50 PiB", units._size_str(1.5 * units.PiB))
      self.assertEqual("1.50 TiB", units._size_str(1.5 * units.TiB))
      self.assertEqual("1.50 GiB", units._size_str(1.5 * units.GiB))
      self.assertEqual("1.50 MiB", units._size_str(1.5 * units.MiB))
      self.assertEqual("1.50 KiB", units._size_str(1.5 * units.KiB))
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import units
label_desc: Use image node_id 2 for calling the UnitsTest obj's underlying member method code with example usage: obj.test_normal_sizes() without return types