code: def testParseNodeName(self):
      node_name, slot = debug_graphs.parse_node_or_tensor_name(
          "namespace1/node_1"
      )
  
      self.assertEqual("namespace1/node_1", node_name)
      self.assertIsNone(slot)
  
imports: from tensorflow.python.debug.lib import debug_graphs
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the ParseNodeOrTensorNameTest obj's underlying member method code with example usage: obj.testParseNodeName() without return types