Revert "Skip flakky CI tests"

This reverts commit be4f0ba.

Author: ogrisel

testing/test_faulthandler.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import io
+import os
 import sys
 
 from _pytest.pytester import Pytester
@@ -71,20 +72,15 @@ def test_disabled():
     assert result.ret == 0
 
 
-@pytest.mark.parametrize(
-    "enabled",
-    [
-        pytest.param(
-            True, marks=pytest.mark.skip(reason="sometimes crashes on CI (#7022)")
-        ),
-        False,
-    ],
-)
+@pytest.mark.parametrize("enabled", [True, False])
 def test_timeout(pytester: Pytester, enabled: bool) -> None:
     """Test option to dump tracebacks after a certain timeout.
 
     If faulthandler is disabled, no traceback will be dumped.
     """
+    if enabled and "CI" in os.environ:
+        pytest.xfail(reason="sometimes crashes on CI (#7022)")
+
     pytester.makepyfile(
         """
     import os, time
@@ -110,10 +106,12 @@ def test_timeout():
     assert result.ret == 0
 
 
-@pytest.mark.skip(reason="sometimes crashes on CI (#7022)")
 @pytest.mark.parametrize("exit_on_timeout", [True, False])
 def test_timeout_and_exit(pytester: Pytester, exit_on_timeout: bool) -> None:
     """Test option to force exit pytest process after a certain timeout."""
+    if "CI" in os.environ:
+        pytest.xfail(reason="sometimes crashes on CI (#7022)")
+
     pytester.makepyfile(
         """
     import os, time