class_docstr: Tests that the basic chrome is displayed when there is no data.
code: def setUpClass(cls):
      src_dir = os.environ["TEST_SRCDIR"]
      binary = os.path.join(
          src_dir, "org_tensorflow_tensorboard/tensorboard/tensorboard"
      )
      cls.logdir = tempfile.mkdtemp(
          prefix="core_test_%s_logdir_" % cls.__name__
      )
      cls.setUpData()
      cls.port = _BASE_PORT + _PORT_OFFSETS[cls]
      cls.process = subprocess.Popen(
          [binary, "--port", str(cls.port), "--logdir", cls.logdir]
      )
  
imports: import collections
  import os
  import subprocess
  import unittest
  import tempfile
  from selenium.webdriver.common import by
  from selenium.webdriver.support import expected_conditions
  from selenium.webdriver.support import wait
  from testing.web import webtest
  from tensorboard.plugins.scalar import scalars_demo
  from tensorboard.plugins.audio import audio_demo
label_desc: Use image node_id 1 for calling the BasicTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types