Write a test runner for Monero transactions

Also includes a few fixes for the library itself. Supersedes #172.

coins/monero/src/rpc.rs

@@ -27,7 +27,7 @@ pub struct JsonRpcResponse<T> {
 #[derive(Deserialize, Debug)]
 struct TransactionResponse {
   tx_hash: String,
-  block_height: usize,
+  block_height: Option<usize>,
   as_hex: String,
   pruned_as_hex: String,
 }
@@ -274,7 +274,7 @@ impl Rpc {
     self.get_transactions(&[tx]).await.map(|mut txs| txs.swap_remove(0))
   }
 
-  pub async fn get_transaction_block_number(&self, tx: &[u8]) -> Result<usize, RpcError> {
+  pub async fn get_transaction_block_number(&self, tx: &[u8]) -> Result<Option<usize>, RpcError> {
     let txs: TransactionsResponse =
       self.rpc_call("get_transactions", Some(json!({ "txs_hashes": [hex::encode(tx)] }))).await?;
 

coins/monero/src/wallet/mod.rs

@@ -18,7 +18,7 @@ pub mod address;
 use address::{Network, AddressType, AddressMeta, MoneroAddress};
 
 mod scan;
-pub use scan::SpendableOutput;
+pub use scan::{ReceivedOutput, SpendableOutput};
 
 pub(crate) mod decoys;
 pub(crate) use decoys::Decoys;

coins/monero/src/wallet/send/mod.rs

@@ -362,7 +362,7 @@ impl SignableTransaction {
 
   /// Sign this transaction.
   pub async fn sign<R: RngCore + CryptoRng>(
-    &mut self,
+    mut self,
     rng: &mut R,
     rpc: &Rpc,
     spend: &Zeroizing<Scalar>,