code: def test_bytesiowrapper_returns_correct_bytes(self):
      # Test latin1, ucs-2, and ucs-4 chars
      data = """a,b,c
  1,2,3
  ©,®,®
  Look,a snake,🐍"""
      with icom.get_handle(
          StringIO(data), "rb", is_text=False
      ) as handles:
          result = b""
          chunksize = 5
          while True:
              chunk = handles.handle.read(chunksize)
              # Make sure each chunk is correct amount of bytes
              assert len(chunk) <= chunksize
              if len(chunk) < chunksize:
                  # Can be less amount of bytes, but only at EOF
                  # which happens when read returns empty
                  assert len(handles.handle.read()) == 0
                  result += chunk
                  break
              result += chunk
          assert result == data.encode("utf-8")
  
imports: import codecs
  import errno
  from functools import partial
  from io import BytesIO, StringIO, UnsupportedOperation
  import mmap
  import os
  from pathlib import Path
  import pickle
  import tempfile
  import numpy
  import pytest
  from pandas.compat import is_platform_windows
  import pandas.util._test_decorators
  import pandas
  import pandas._testing
  import pandas.io.common
label_desc: Use image node_id 10 for calling the TestCommonIOCapabilities obj's underlying member method code with example usage: obj.test_bytesiowrapper_returns_correct_bytes() without return types