code: def test_register_backend_entrypoint(tmp_path):
      # Create special sizeof implementation for a dummy class
      (tmp_path / "impl_sizeof.py").write_bytes(
          b"def sizeof_plugin(sizeof):\n"
          b'    print("REG")\n'
          b'    @sizeof.register_lazy("class_impl")\n'
          b"    def register_impl():\n"
          b"        import class_impl\n"
          b"        @sizeof.register(class_impl.Impl)\n"
          b"        def sizeof_impl(obj):\n"
          b"            return obj.size \n"
      )
      # Define dummy class that possesses a size attribute
      (tmp_path / "class_impl.py").write_bytes(
          b"class Impl:\n    def __init__(self, size):\n        self.size = size"
      )
      dist_info = tmp_path / "impl_sizeof-0.0.0.dist-info"
      dist_info.mkdir()
      (dist_info / "entry_points.txt").write_bytes(
          b"[dask.sizeof]\nimpl = impl_sizeof:sizeof_plugin\n"
      )
  
      with get_context().Pool(1) as pool:
          assert (
              pool.apply(
                  _get_sizeof_on_path, args=(tmp_path, 3_14159265)
              )
              == 3_14159265
          )
      pool.join()
  
imports: from __future__ import annotations
  import os
  import sys
  from array import array
  import pytest
  from dask.multiprocessing import get_context
  from dask.sizeof import sizeof
  from dask.utils import funcname
label_desc: Use image node_id 19 for calling a global function with example usage: test_register_backend_entrypoint(tmp_path) without return types