text: import pytest
  from vcr.serializers.jsonserializer import serialize
  from vcr.request import Request
  
  
  def test_serialize_binary():
      request = Request(
          method='GET',
          uri='http://localhost/',
          body='',
          headers={},
      )
      cassette = {'requests': [request], 'responses': [{'body': b'\x8c'}]}
  
      with pytest.raises(Exception) as e:
          serialize(cassette)
          assert e.message == "Error serializing cassette to JSON. Does this \
              HTTP interaction contain binary data? If so, use a different \
              serializer (like the yaml serializer) for this request"
  