Add proptest for arbitrary target

prop/src/main.rs

@@ -73,8 +73,45 @@ proptest! {
         let sum: Amount = selection.into_iter().sum();
         assert_eq!(target, sum);
     }
+
+    #[test]
+    fn test_bnb_arbitrary_target(t in any::<u64>()) {
+        let target_str = format!("{} cBTC", t % 10);
+        let target = Amount::from_str(&target_str).unwrap();
+
+        let pool: Vec<_> = (1..10)
+            .map(|i| format!("{} cBTC", i))
+            .map(|s| Amount::from_str(&s).unwrap())
+            .map(|a| {
+                let output = TxOut {
+                    value: a,
+                    script_pubkey: ScriptBuf::new()
+                };
+
+                let satisfaction_weight = Weight::ZERO;
+
+                Utxo {
+                    output,
+                    satisfaction_weight
+                }
+            })
+        .collect();
+
+        let selection_sum: Amount =
+            select_coins_bnb(
+                target,
+                Amount::ZERO,
+                FeeRate::ZERO,
+                FeeRate::ZERO,
+                &pool)
+            .unwrap()
+            .map(|i| i.value()).sum();
+
+        assert_eq!(selection_sum, target);
+    }
 }
 
 fn main() {
     test_bnb_arbitrary_pool();
+    test_bnb_arbitrary_target();
 }