The test sometimes passes: our routing logic always chooses between
the shorter of two equal-cost routes (because we compare best with <
not <=).
By adding another hop, we add more noise, and by making the alternate
route fee 0 we provide the worst case.
But to be fair, we make the amount of the payment ~50c (15,000,000
msat), and increase our cltv-delay to 14 and fee-base 1000 to match
mainnet. The final patch shows the effect of this choice.
Otherwise our risk penalty is completely in the noise on
mainnet which has the vast majority of fees set at 1000msat + 1ppm.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell
706debf3d4