class_docstr: Test COCO utils.
docstr: Test get_label_map.
docstr_tok: ["Test","get_label_map","."]
code: def get_label_map(self, tfds_name):
      """Test get_label_map."""
      label_map = coco_utils.get_label_map(tfds_name)
      self.assertIs(label_map, dict)
      self.assertTrue(
          all(isinstance(k, int) for k in label_map.keys()),
          msg="Not all label map keys are of type int.",
      )
      max_label = max(label_map.keys())
      self.assertSequenceEqual(range(max_label), label_map.keys())
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from scenic.dataset_lib.coco_dataset import coco_utils
label_desc: Use image node_id 1 for calling the CocoUtilsTest obj's underlying member method code with example usage: obj.get_label_map(tfds_name) without return types