Macro expect_payment_sent

macro_rules! expect_payment_sent {
    ($node: expr, $expected_payment_preimage: expr) => { ... };
    ($node: expr, $expected_payment_preimage: expr, $expected_fee_msat_opt: expr) => { ... };
    ($node: expr, $expected_payment_preimage: expr, $expected_fee_msat_opt: expr, $expect_paths: expr) => { ... };
}