def METHOD_NAME(self):
    """Verify AncillaRegisters are found by find_bit by their locations in qubits/qregs."""
    qreg = QuantumRegister(3, "qr")
    areg = AncillaRegister(5, "ar")
    qc = QuantumCircuit()
    qc.add_register(qreg)
    qc.add_register(areg)
    for idx, bit in enumerate(areg):
        self.assertEqual(qc.find_bit(bit), (idx + len(qreg), [(areg, idx)]))