rpc: Reject deprecated reserveChangeKey in fundrawtransaction

doc/release-notes.md

@@ -56,6 +56,13 @@ frequently tested on them.
 Notable changes
 ===============
 
+RPC changes
+------------
+
+### Low-level changes
+
+- The `fundrawtransaction` rpc will reject the previously deprecated `reserveChangeKey` option.
+
 Credits
 =======
 

src/wallet/rpcwallet.cpp

@@ -3129,7 +3129,6 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
                 {"change_type", UniValueType(UniValue::VSTR)},
                 {"includeWatching", UniValueType(UniValue::VBOOL)},
                 {"lockUnspents", UniValueType(UniValue::VBOOL)},
-                {"reserveChangeKey", UniValueType(UniValue::VBOOL)}, // DEPRECATED (and ignored), should be removed in 0.16 or so.
                 {"feeRate", UniValueType()}, // will be checked below
                 {"subtractFeeFromOutputs", UniValueType(UniValue::VARR)},
                 {"replaceable", UniValueType(UniValue::VBOOL)},

test/functional/rpc_fundrawtransaction.py

@@ -181,6 +181,9 @@ class RawTransactionsTest(BitcoinTestFramework):
 
         assert_raises_rpc_error(-3, "Unexpected key foo", self.nodes[2].fundrawtransaction, rawtx, {'foo':'bar'})
 
+        # reserveChangeKey was deprecated and is now removed
+        assert_raises_rpc_error(-3, "Unexpected key reserveChangeKey", lambda: self.nodes[2].fundrawtransaction(hexstring=rawtx, options={'reserveChangeKey': True}))
+
         ############################################################
         # test a fundrawtransaction with an invalid change address #
         ############################################################