caddy-frontend/test: Check QUIC after USR1

Asserts Caddy issue https://github.com/mholt/caddy/issues/2394

software/caddy-frontend/test/test.py

@@ -35,6 +35,7 @@ import multiprocessing
 import subprocess
 from unittest import skip
 import ssl
+import signal
 from BaseHTTPServer import HTTPServer
 from BaseHTTPServer import BaseHTTPRequestHandler
 from forcediphttpsadapter.adapters import ForcedIPHTTPSAdapter
@@ -3466,6 +3467,7 @@ class TestQuicEnabled(SlaveHttpFrontendTestCase, TestDataMixin):
     self.assertKeyWithPop('Date', result.headers)
     self.assertKeyWithPop('Content-Length', result.headers)
 
+    def assertQUIC():
       quic_status, quic_result = getQUIC(
         'https://%s/%s' % (parameter_dict['domain'], 'test-path'),
         parameter_dict['public-ipv4'],
@@ -3487,6 +3489,17 @@ class TestQuicEnabled(SlaveHttpFrontendTestCase, TestDataMixin):
       self.assertTrue(key in j, 'No key %r in %s' % (key, j))
       self.assertEqual('/test-path', j[key])
 
+    assertQUIC()
+    # https://github.com/mholt/caddy/issues/2394
+    # after sending USR1 to Caddy QUIC does not work, check current behaviour
+    caddy_pid = [
+      q['pid'] for q
+      in self.getSupervisorRPCServer().supervisor.getAllProcessInfo()
+      if 'frontend_caddy' in q['name']][0]
+    os.kill(caddy_pid, signal.SIGUSR1)
+
+    assertQUIC()
+
 
 class TestSlaveBadParameters(SlaveHttpFrontendTestCase, TestDataMixin):
   @classmethod