docstr: Tests vertex coordinate and color parsing.
code: def test_parse_vertex(self):
      """Tests vertex coordinate and color parsing."""
      # Vertex 3D coordinates with RGBA color.
      vertex_data = [-0.249245, 1.119303, 0.3095566, 60, 253, 32, 255]
      coords, colors = demo_utils._parse_vertex(
          " ".join(map(str, vertex_data))
      )
      self.assertListEqual(coords, vertex_data[:3])
      self.assertListEqual(colors, vertex_data[3:6])
  
file_path: tensorboard/tensorboard/plugins/mesh/demo_utils_test.py
imports: import os
  import tensorflow
  from tensorboard.plugins.mesh import demo_utils
label_desc: Use image node_id 1 for calling the TestPLYReader obj's underlying member method code with example usage: obj.test_parse_vertex() without return types