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[3.9] bpo-11105: reduce the recursion limit for tests (GH-26550). #26605

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Jun 8, 2021
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[3.9] bpo-11105: reduce the recursion limit for tests (GH-26550). #26605

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10 changes: 10 additions & 0 deletions Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3199,3 +3199,13 @@ def skip_if_broken_multiprocessing_synchronize():
synchronize.Lock(ctx=None)
except OSError as exc:
raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")


@contextlib.contextmanager
def infinite_recursion(max_depth=75):
original_depth = sys.getrecursionlimit()
try:
sys.setrecursionlimit(max_depth)
yield
finally:
sys.setrecursionlimit(original_depth)
6 changes: 4 additions & 2 deletions Lib/test/test_ast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1031,15 +1031,17 @@ def test_recursion_direct(self):
e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
e.operand = e
with self.assertRaises(RecursionError):
compile(ast.Expression(e), "<test>", "eval")
with support.infinite_recursion():
compile(ast.Expression(e), "<test>", "eval")

def test_recursion_indirect(self):
e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
f = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
e.operand = f
f.operand = e
with self.assertRaises(RecursionError):
compile(ast.Expression(e), "<test>", "eval")
with support.infinite_recursion():
compile(ast.Expression(e), "<test>", "eval")


class ASTValidatorTests(unittest.TestCase):
Expand Down