Merge #261: add get raw change address

078ae14 get raw change address (thesimplekid)

Pull request description:

ACKs for top commit:
  apoelstra:
    ACK 078ae14
  w0xlt:
    ACK 078ae14

Tree-SHA512: b7ca1c44ef6888caeaa7904c575bb10debc7a965cfba5b27f6bbbcb31239140184e613e755bda8408078f51ee370fb415bcc1bd7a36681ac090e22b4a5f548e0

client/src/client.rs

@@ -886,6 +886,11 @@ pub trait RpcApi: Sized {
         self.call("getnewaddress", &[opt_into_json(label)?, opt_into_json(address_type)?])
     }
 
+    /// Generate new address for receiving change
+    fn get_raw_change_address(&self, address_type: Option<json::AddressType>) -> Result<Address> {
+        self.call("getrawchangeaddress", &[opt_into_json(address_type)?])
+    }
+
     fn get_address_info(&self, address: &Address) -> Result<json::GetAddressInfoResult> {
         self.call("getaddressinfo", &[address.to_string().into()])
     }

integration_test/src/main.rs

@@ -136,6 +136,7 @@ fn main() {
     test_get_mining_info(&cl);
     test_get_blockchain_info(&cl);
     test_get_new_address(&cl);
+    test_get_raw_change_address(&cl);
     test_dump_private_key(&cl);
     test_generate(&cl);
     test_get_balance_generate_to_address(&cl);
@@ -241,6 +242,17 @@ fn test_get_new_address(cl: &Client) {
     assert_eq!(addr.address_type(), Some(bitcoin::AddressType::P2sh));
 }
 
+fn test_get_raw_change_address(cl: &Client) {
+    let addr = cl.get_raw_change_address(Some(json::AddressType::Legacy)).unwrap();
+    assert_eq!(addr.address_type(), Some(bitcoin::AddressType::P2pkh));
+
+    let addr = cl.get_raw_change_address(Some(json::AddressType::Bech32)).unwrap();
+    assert_eq!(addr.address_type(), Some(bitcoin::AddressType::P2wpkh));
+
+    let addr = cl.get_raw_change_address(Some(json::AddressType::P2shSegwit)).unwrap();
+    assert_eq!(addr.address_type(), Some(bitcoin::AddressType::P2sh));
+}
+
 fn test_dump_private_key(cl: &Client) {
     let addr = cl.get_new_address(None, Some(json::AddressType::Bech32)).unwrap();
     let sk = cl.dump_private_key(&addr).unwrap();