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bpo-11105: use a lower recursion limit for infinite recursion tests #26550

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Jun 8, 2021
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bpo-11105: use a lower recursion limit for infinite recursion tests #26550

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9 changes: 9 additions & 0 deletions Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1999,3 +1999,12 @@ def check_disallow_instantiation(testcase, tp, *args, **kwds):
qualname = f"{name}"
msg = f"cannot create '{re.escape(qualname)}' instances"
testcase.assertRaisesRegex(TypeError, msg, tp, *args, **kwds)

@contextlib.contextmanager
def infinite_recursion(max_depth=75):
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@Fidget-Spinner Fidget-Spinner Jun 8, 2021 •
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Minor suggestion: I think adding a docstring would help others know where/why/when they need this.

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Ah, missed this one! Yeap, forgot to do that. Will add a follow up PR.

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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Expand Up @@ -1102,15 +1102,17 @@ 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):
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