🧪 Make flaky tests on PyPy 3.6 + Ubuntu as xfail

cheroot/test/test_conn.py

@@ -3,6 +3,7 @@
 import errno
 from re import match as _matches_pattern
 import socket
+import sys
 import time
 import logging
 import traceback as traceback_
@@ -18,6 +19,7 @@
 import cheroot.server
 
 
+IS_PY36 = sys.version_info[:2] == (3, 6)
 IS_SLOW_ENV = IS_MACOS or IS_WINDOWS
 
 
@@ -806,6 +808,11 @@ def _trigger_kb_intr(_req, _resp):
         )
 
 
+@pytest.mark.xfail(
+    IS_CI and IS_PYPY and IS_PY36 and not IS_SLOW_ENV,  # NOTE: Actually covers any Linux
+    reason='Fails under PyPy 3.6 under Ubuntu 20.04 in CI for unknown reason',
+    strict=False,
+)
 def test_unhandled_exception_in_request_handler(
         mocker,
         monkeypatch,
@@ -875,6 +882,11 @@ def _trigger_scary_exc(_req, _resp):
         )
 
 
+@pytest.mark.xfail(
+    IS_CI and IS_PYPY and IS_PY36 and not IS_SLOW_ENV,  # NOTE: Actually covers any Linux
+    reason='Fails under PyPy 3.6 under Ubuntu 20.04 in CI for unknown reason',
+    strict=False,
+)
 def test_remains_alive_post_unhandled_exception(
         mocker,
         monkeypatch,