import subprocess

import unittest

class TestPythonLspServer(unittest.TestCase):

def test_initialize(self):

server = subprocess.Popen(

'python -m pylsp --check-parent-process',

shell=True,

stdin=subprocess.PIPE,

stdout=subprocess.PIPE)

response = server.communicate(input=

b'Content-Length: 67\r\n'

b'Content-Type: application/vscode-jsonrpc; charset=utf8\r\n'

b'\r\n'

b'{"id": "a", "jsonrpc": "2.0", "method": "initialize", "params": {}}')[0]

assert 'capabilities' in response.decode('utf-8')