code: def test_send_from_directory(self, app, req_ctx):
      app.root_path = os.path.join(
          os.path.dirname(__file__), "test_apps", "subdomaintestmodule"
      )
      rv = flask.send_from_directory("static", "hello.txt")
      rv.direct_passthrough = False
      assert rv.data.strip() == b"Hello Subdomain"
      rv.close()
  
imports: import io
  import os
  import pytest
  import werkzeug.exceptions
  import flask
  from flask.helpers import get_debug_flag
label_desc: Use image node_id 3 for calling the TestSendfile obj's underlying member method code with example usage: obj.test_send_from_directory(app, req_ctx) without return types