code: def testIsIsTensorFlowEventsFileWithEmptyInput(self):
      with self.assertRaisesRegex(
          ValueError, r"Path must be a nonempty string"
      ):
          io_wrapper.IsTensorFlowEventsFile("")
  
imports: import os
  import tempfile
  import tensorflow
  from tensorboard.backend.event_processing import io_wrapper
label_desc: Use image node_id 8 for calling the IoWrapperTest obj's underlying member method code with example usage: obj.testIsIsTensorFlowEventsFileWithEmptyInput() without return types