code: def test(self):
      # Create a fake server binary so that the `os.path.exists` check
      # passes.
      fake_binary_path = os.path.join(self.get_temp_dir(), "server")
      with open(fake_binary_path, "wb"):
          pass
      binary_info = server_ingester.ServerBinary(
          fake_binary_path, version=None
      )
  
      tmpdir = tempfile.TemporaryDirectory()
      self.enter_context(
          mock.patch.object(
              tempfile, "TemporaryDirectory", return_value=tmpdir
          )
      )
      port_file = os.path.join(tmpdir.name, "port")
      error_file = os.path.join(tmpdir.name, "startup_error")
  
      real_popen = subprocess.Popen
  
      # Stub out `subprocess.Popen` to write the port file.
      def fake_popen(subprocess_args, *args, **kwargs):
          def target():
              time.sleep(0.2)  # wait one cycle
              with open(port_file, "w") as outfile:
                  outfile.write("23456\n")
  
          result = mock.create_autospec(real_popen, instance=True)
          result.stdin = mock.Mock()
          result.poll = lambda: None
          result.pid = 789
          threading.Thread(target=target).start()
          return result
  
      tilde_logdir = "~/tmp/logs"
      expanded_logdir = os.path.expanduser(tilde_logdir)
      self.assertNotEqual(tilde_logdir, expanded_logdir)
  
      with mock.patch.object(
          subprocess, "Popen", wraps=fake_popen
      ) as popen:
          with mock.patch.object(
              grpc, "secure_channel", autospec=True
          ) as sc:
              ingester = server_ingester.SubprocessServerDataIngester(
                  server_binary=binary_info,
                  logdir=tilde_logdir,
                  reload_interval=5,
                  channel_creds_type=grpc_util.ChannelCredsType.LOCAL,
                  samples_per_plugin={
                      "scalars": 500,
                      "images": 0,
                  },
                  extra_flags=["--extra-flags", "--for-fun"],
              )
              ingester.start()
      self.assertIsInstance(
          ingester.data_provider, grpc_provider.GrpcDataProvider
      )
  
      expected_args = [
          fake_binary_path,
          "--logdir=%s" % expanded_logdir,
          "--reload=5",
          "--samples-per-plugin=scalars=500,images=all",
          "--port=0",
          "--port-file=%s" % port_file,
          "--die-after-stdin",
          "--error-file=%s" % error_file,
          "--verbose",  # logging is enabled in tests
          "--extra-flags",
          "--for-fun",
      ]
      popen.assert_called_once_with(
          expected_args, stdin=subprocess.PIPE
      )
      sc.assert_called_once_with(
          "localhost:23456", mock.ANY, options=mock.ANY
      )
  
imports: import os
  import subprocess
  import tempfile
  import threading
  import time
  from unittest import mock
  import grpc
  from tensorboard import test
  from tensorboard.data import grpc_provider
  from tensorboard.data import server_ingester
  from tensorboard.util import grpc_util
label_desc: Use image node_id 1 for calling the SubprocessServerDataIngesterTest obj's underlying member method code with example usage: obj.test() and returns: result