sanic/tests/test_custom_protocol.py

from sanic.server import HttpProtocol
from sanic.response import text


class CustomHttpProtocol(HttpProtocol):

    def write_response(self, response):
        if isinstance(response, str):
            response = text(response)
        self.transport.write(
            response.output(self.request.version)
        )
        self.transport.close()


def test_use_custom_protocol(app):

    @app.route('/1')
    async def handler_1(request):
        return 'OK'

    server_kwargs = {
        'protocol': CustomHttpProtocol
    }
    request, response = app.test_client.get(
        '/1', server_kwargs=server_kwargs)
    assert response.status == 200
    assert response.text == 'OK'