code: def fsspectest():
      pytest.importorskip("fsspec")
      from fsspec import register_implementation
      from fsspec.implementations.memory import MemoryFileSystem
      from fsspec.registry import _registry as registry
  
      class TestMemoryFS(MemoryFileSystem):
          protocol = "testmem"
          test = [None]
  
          def __init__(self, **kwargs) -> None:
              self.test[0] = kwargs.pop("test", None)
              super().__init__(**kwargs)
  
      register_implementation("testmem", TestMemoryFS, clobber=True)
      yield TestMemoryFS()
      registry.pop("testmem", None)
      TestMemoryFS.test[0] = None
      TestMemoryFS.store.clear()
  
imports: import io
  import numpy
  import pytest
  from pandas import DataFrame, date_range, read_csv, read_excel, read_feather, read_json, read_parquet, read_pickle, read_stata, read_table
  import pandas._testing
  from pandas.util import _test_decorators
label_desc: Use image node_id 1 for calling a global function with example usage: fsspectest() without return types