class_docstr: Unit tests for Visualizer.
class_docstr_tok: ["Unit","tests","for","Visualizer","."]
code: def test_no_profiler(self):
      p = (
          pipe.input("a")
          .map("a", "b", lambda x: x + 1)
          .output("a", "b")
      )
      v = p.debug(3, tracer=True)
      self.assertIsNone(v.profiler)
  
file_path: towhee/tests/unittests/tools/test_visualizer.py
imports: import unittest
  from towhee import pipe
  from towhee.tools import visualizer
  from towhee.tools.visualizer import Visualizer
  from towhee.runtime.data_queue import DataQueue
label_desc: Use image node_id 7 for calling the TestVisualizer obj's underlying member method code with example usage: obj.test_no_profiler() without return types