Add a send test

coins/monero/tests/rpc.rs

@@ -0,0 +1,13 @@
+use serde_json::json;
+
+use monero_serai::rpc::{EmptyResponse, RpcError, Rpc};
+
+pub async fn mine_block(rpc: &Rpc, address: String) -> Result<EmptyResponse, RpcError> {
+  rpc.rpc_call("json_rpc", Some(json!({
+    "method": "generateblocks",
+    "params": {
+      "wallet_address": address,
+      "amount_of_blocks": 10
+    },
+  }))).await
+}