Add basic bitcoind test

Add an initial test using the `bitcoind` crate and call the RPC command
`get_blockchain_info` to check it all works.

Cargo.toml

@@ -38,6 +38,7 @@ core2 = { version = "0.3.2", default-features = false, features = ["alloc"], opt
 
 [dev-dependencies]
 anyhow = "1"
+bitcoind = { version = "0.34.1", features = ["25_1"] }
 serde_json = "1.0.0"
 serde_test = "1.0.19"
 serde_derive = "1.0.103"

tests/bitcoind.rs

@@ -0,0 +1,8 @@
+use bitcoind::bitcoincore_rpc;
+
+#[test]
+fn bitcoind_get_blockchain_info() {
+    use bitcoincore_rpc::RpcApi;
+    let bitcoind = bitcoind::BitcoinD::from_downloaded().expect("failed to init bitcoind");
+    assert_eq!(0, bitcoind.client.get_blockchain_info().unwrap().blocks);
+}