code: def test_summarywriter_scalar(self):
      log_dir = tempfile.mkdtemp()
      summary_writer = SummaryWriter(log_dir=log_dir)
      # Write the scalar and check if the event exists and check data.
      float_value = 99.1232
      summary_writer.scalar(
          tag="scalar_test", value=float_value, step=1
      )
  
      summary_value = self.parse_and_return_summary_value(path=log_dir)
      self.assertEqual(summary_value.tag, "scalar_test")
      self.assertTrue(
          np.allclose(
              tensor_util.make_ndarray(summary_value.tensor).item(),
              float_value,
          )
      )
  
imports: import itertools
  import pathlib
  import tempfile
  import numpy
  import tensorflow
  from absl.testing import absltest
  from tensorboard.backend.event_processing import directory_watcher, event_file_loader
  from tensorboard.util import tensor_util
  from flax.metrics.tensorboard import SummaryWriter, _flatten_dict
label_desc: Use image node_id 3 for calling the TensorboardTest obj's underlying member method code with example usage: obj.test_summarywriter_scalar() without return types