class_docstr: Tests for `ExperimentIdMiddleware` when it is nested.
class_docstr_tok: ["Tests","for","`","ExperimentIdMiddleware","`","when","it","is","nested","."]
code: def _create_app(self):
      app = experiment_id.ExperimentIdMiddleware(self._echo_app)
      app = experiment_id.ExperimentIdMiddleware(app)
      app = experiment_id.ExperimentIdMiddleware(app)
      return app
  
imports: import json
  import werkzeug
  from werkzeug import test
  from tensorboard import test
  from tensorboard.backend import experiment_id
label_desc: Use image node_id 1 for calling the ExperimentIdMiddlewareNestedTest obj's underlying member method code with example usage: obj._create_app() and returns: app