mirror of https://github.com/python/cpython
bpo-1635741: test_embed cheks that Python does not leak (GH-31555)
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@ -118,7 +118,7 @@ class CmdLineTest(unittest.TestCase):
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self.assertEqual(out.rstrip(), b'{}')
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self.assertEqual(err, b'')
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# "-X showrefcount" shows the refcount, but only in debug builds
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rc, out, err = run_python('-X', 'showrefcount', '-c', code)
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rc, out, err = run_python('-I', '-X', 'showrefcount', '-c', code)
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self.assertEqual(out.rstrip(), b"{'showrefcount': True}")
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if Py_DEBUG:
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# bpo-46417: Tolerate negative reference count which can occur
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@ -1641,6 +1641,27 @@ class MiscTests(EmbeddingTestsMixin, unittest.TestCase):
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""").lstrip()
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self.assertEqual(out, expected)
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@unittest.skipUnless(hasattr(sys, 'gettotalrefcount'),
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'-X showrefcount requires a Python debug build')
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def test_no_memleak(self):
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# bpo-1635741: Python must release all memory at exit
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cmd = [sys.executable, "-I", "-X", "showrefcount", "-c", "pass"]
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proc = subprocess.run(cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True)
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self.assertEqual(proc.returncode, 0)
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out = proc.stdout.rstrip()
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match = re.match(r'^\[(-?\d+) refs, (-?\d+) blocks\]', out)
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if not match:
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self.fail(f"unexpected output: {out!a}")
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refs = int(match.group(1))
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blocks = int(match.group(2))
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# bpo-46417: Tolerate negative reference count which can occur because
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# of bugs in C extensions. It is only wrong if it's greater than 0.
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self.assertLessEqual(refs, 0, out)
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self.assertEqual(blocks, 0, out)
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class StdPrinterTests(EmbeddingTestsMixin, unittest.TestCase):
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# Test PyStdPrinter_Type which is used by _PySys_SetPreliminaryStderr():
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