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Remove patching of SwapGate.__new__ from Sabre test #11012

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Oct 13, 2023
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Remove patching of SwapGate.__new__ from Sabre test #11012

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15 changes: 3 additions & 12 deletions test/python/transpiler/test_sabre_swap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -230,18 +230,9 @@ def test_no_infinite_loop(self, method):
coupling_map = CouplingMap.from_line(qc.num_qubits)
routing_pass = PassManager(SabreSwap(coupling_map, method))

n_swap_gates = 0

def leak_number_of_swaps(cls, *args, **kwargs):
nonlocal n_swap_gates
n_swap_gates += 1
if n_swap_gates > 1_000:
raise Exception("SabreSwap seems to be stuck in a loop")
# pylint: disable=bad-super-call
return super(SwapGate, cls).__new__(cls, *args, **kwargs)

with unittest.mock.patch.object(SwapGate, "__new__", leak_number_of_swaps):
routed = routing_pass.run(qc)
# Since all the logic happens in Rust space these days, the best we'll really see here is
# the test hanging.
routed = routing_pass.run(qc)

routed_ops = routed.count_ops()
del routed_ops["swap"]
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