pythongh-83434: Disable XML in regrtest when -R option is used (python#117232)

(cherry picked from commit d52bdfb)

Author: vstinner

Lib/test/libregrtest/cmdline.py

@@ -173,6 +173,7 @@ def __init__(self, **kwargs) -> None:
         self.fail_rerun = False
         self.tempdir = None
         self._add_python_opts = True
+        self.xmlpath = None
 
         super().__init__(**kwargs)
 
@@ -499,17 +500,28 @@ def _parse_args(args, **kwargs):
         ns.randomize = True
     if ns.verbose:
         ns.header = True
+
     # When -jN option is used, a worker process does not use --verbose3
     # and so -R 3:3 -jN --verbose3 just works as expected: there is no false
     # alarm about memory leak.
     if ns.huntrleaks and ns.verbose3 and ns.use_mp is None:
-        ns.verbose3 = False
         # run_single_test() replaces sys.stdout with io.StringIO if verbose3
         # is true. In this case, huntrleaks sees an write into StringIO as
         # a memory leak, whereas it is not (gh-71290).
+        ns.verbose3 = False
         print("WARNING: Disable --verbose3 because it's incompatible with "
               "--huntrleaks without -jN option",
               file=sys.stderr)
+
+    if ns.huntrleaks and ns.xmlpath:
+        # The XML data is written into a file outside runtest_refleak(), so
+        # it looks like a leak but it's not. Simply disable XML output when
+        # hunting for reference leaks (gh-83434).
+        ns.xmlpath = None
+        print("WARNING: Disable --junit-xml because it's incompatible "
+              "with --huntrleaks",
+              file=sys.stderr)
+
     if ns.forever:
         # --forever implies --failfast
         ns.failfast = True

Lib/test/test_regrtest.py

@@ -455,6 +455,24 @@ def test_bisect(self):
         regrtest = self.create_regrtest(args)
         self.assertTrue(regrtest.want_bisect)
 
+    def test_verbose3_huntrleaks(self):
+        args = ['-R', '3:10', '--verbose3']
+        with support.captured_stderr():
+            regrtest = self.create_regrtest(args)
+        self.assertIsNotNone(regrtest.hunt_refleak)
+        self.assertEqual(regrtest.hunt_refleak.warmups, 3)
+        self.assertEqual(regrtest.hunt_refleak.runs, 10)
+        self.assertFalse(regrtest.output_on_failure)
+
+    def test_xml_huntrleaks(self):
+        args = ['-R', '3:12', '--junit-xml', 'output.xml']
+        with support.captured_stderr():
+            regrtest = self.create_regrtest(args)
+        self.assertIsNotNone(regrtest.hunt_refleak)
+        self.assertEqual(regrtest.hunt_refleak.warmups, 3)
+        self.assertEqual(regrtest.hunt_refleak.runs, 12)
+        self.assertIsNone(regrtest.junit_filename)
+
 
 @dataclasses.dataclass(slots=True)
 class Rerun:

Misc/NEWS.d/next/Tests/2024-03-25-21-31-49.gh-issue-83434.U7Z8cY.rst

@@ -0,0 +1,3 @@
+Disable JUnit XML output (``--junit-xml=FILE`` command line option) in
+regrtest when hunting for reference leaks (``-R`` option). Patch by Victor
+Stinner.