The use of native segwit addresses (pure p2wpkh instead of p2sh-p2wpkh) leads to smaller transaction sizes, needing adaption of some constants in the following test cases:
test_dust_to_fee(): adaption of dust calculation (p2wpkh spend estimate of 67 is taken fromsrc/policy/policy.cpp:GetDustThreshold())test_maxtxfee_fails(): lowering-maxtxfeesetting to trigger fail