test: Check that the feerate is never below...

...the requested one in assert_fee_rate

Author: danielabrozzoni

src/wallet/mod.rs

@@ -2022,7 +2022,7 @@ pub(crate) mod test {
             let fee_rate = $fee_rate;
 
             if !dust_change {
-                assert!((tx_fee_rate - fee_rate).as_sat_vb().abs() < 0.5, "Expected fee rate of {:?}, the tx has {:?}", fee_rate, tx_fee_rate);
+                assert!(tx_fee_rate >= fee_rate && (tx_fee_rate - fee_rate).as_sat_vb().abs() < 0.5, "Expected fee rate of {:?}, the tx has {:?}", fee_rate, tx_fee_rate);
             } else {
                 assert!(tx_fee_rate >= fee_rate, "Expected fee rate of at least {:?}, the tx has {:?}", fee_rate, tx_fee_rate);
             }