text: import io
  
  import pytest
  
  from falcon.request_helpers import BoundedStream
  
  
  @pytest.fixture
  def bounded_stream():
      return BoundedStream(io.BytesIO(), 1024)
  
  
  def test_not_writeable(bounded_stream):
      assert not bounded_stream.writeable()
  
      with pytest.raises(IOError):
          bounded_stream.write(b'something something')
  