How to use the uvloop._testbase.find_free_port function in uvloop

async def test():
            port = tb.find_free_port()
            srv = await self.loop.create_server(Proto, '127.0.0.1', port)
            wsrv = weakref.ref(srv)
            del srv

            gc.collect()
            gc.collect()
            gc.collect()

            s = socket.socket(socket.AF_INET)
            with s:
                s.setblocking(False)
                await self.loop.sock_connect(s, ('127.0.0.1', port))
                d = await self.loop.sock_recv(s, 100)
                self.assertEqual(d, b'hello')

            srv = wsrv()

async def test():
            port = tb.find_free_port()
            srv = await self.loop.create_server(Proto, '127.0.0.1', port)

            s = socket.socket(socket.AF_INET)
            with s:
                s.setblocking(False)
                await self.loop.sock_connect(s, ('127.0.0.1', port))
                await self.loop.sock_sendall(s, b'a' * SIZE)
                d = await self.loop.sock_recv(s, 100)
                self.assertEqual(d, b'hello')

            srv.close()
            await srv.wait_closed()

async def test(proto_factory, exc_type, exc_re):
            port = tb.find_free_port()
            proto = proto_factory()
            srv = await self.loop.create_server(
                lambda: proto, '127.0.0.1', port)

            try:
                s = socket.socket(socket.AF_INET)
                with s:
                    s.setblocking(False)
                    await self.loop.sock_connect(s, ('127.0.0.1', port))
                    await self.loop.sock_sendall(s, b'a')
                    d = await self.loop.sock_recv(s, 100)
                    if not d:
                        raise ConnectionResetError
            except ConnectionResetError:
                pass
            else:

def test_create_server_6(self):
        if not hasattr(socket, 'SO_REUSEPORT'):
            raise unittest.SkipTest(
                'The system does not support SO_REUSEPORT')

        if sys.version_info[:3] < (3, 5, 1):
            raise unittest.SkipTest(
                'asyncio in CPython 3.5.0 does not have the '
                'reuse_port argument')

        port = tb.find_free_port()

        async def runner():
            srv1 = await self.loop.create_server(
                asyncio.Protocol,
                None, port,
                reuse_port=True)

            srv2 = await self.loop.create_server(
                asyncio.Protocol,
                None, port,
                reuse_port=True)

            srv1.close()
            srv2.close()

            await srv1.wait_closed()

def test_create_server_5(self):
        # Test that create_server sets the TCP_IPV6ONLY flag,
        # so it can bind to ipv4 and ipv6 addresses
        # simultaneously.

        port = tb.find_free_port()

        async def runner():
            srv = await self.loop.create_server(
                asyncio.Protocol,
                None, port)

            srv.close()
            await srv.wait_closed()

        self.loop.run_until_complete(runner())