import asyncio

async def connect():
    print('connecting...')
    reader, writer = await asyncio.open_connection('127.0.0.1', 8888)
    writer.write(b'hello world')
    data = await reader.read(100)
    assert data == b'hello world'
    writer.close()
    await writer.wait_closed()
    print('closed connection')
    return data

async def handle_client(reader, writer):
    print('incoming connection')
    try:
        while True:
            data = await reader.read(100)
            if data == b'':
                return
            writer.write(data)
            await writer.drain()
    finally:
        print('incoming connection closed')

async def main():
    server = await asyncio.start_server(handle_client, '127.0.0.1', 8888)
    print('server now set up')
    await connect()
    server.close()
    await server.wait_closed()

asyncio.run(main())