import os
import subprocess
import sys
import tempfile
import time
from pathlib import Path
from unittest import TestCase


class ParentExitTest(TestCase):
    def test_backend_shuts_down_when_ui_owner_exits(self):
        with tempfile.TemporaryDirectory() as directory:
            path=Path(directory)/'service.sock'
            source='''import os,subprocess,sys,time
p=subprocess.Popen([sys.executable,'-m','station.control_service','--socket',sys.argv[1],'--offline','--parent-pid',str(os.getpid())],stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL)
print(p.pid,flush=True)
end=time.monotonic()+8
while not os.path.exists(sys.argv[1]) and p.poll() is None and time.monotonic()<end:time.sleep(.02)
assert os.path.exists(sys.argv[1])
'''
            parent=subprocess.run([sys.executable,'-c',source,str(path)],capture_output=True,text=True,timeout=12)
            self.assertEqual(parent.returncode,0,parent.stderr)
            end=time.monotonic()+8
            while path.exists() and time.monotonic()<end: time.sleep(.1)
            if path.exists():
                os.kill(int(parent.stdout.strip()),15)
                self.fail('orphan backend did not stop')