[qa] assert 'changePosition out of bounds'

qa/rpc-tests/fundrawtransaction.py

@@ -247,6 +247,12 @@ class RawTransactionsTest(BitcoinTestFramework):
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
         change = self.nodes[2].getnewaddress()
+        try:
+            rawtxfund = self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': change, 'changePosition': 2})
+        except JSONRPCException as e:
+            assert('changePosition out of bounds' == e.error['message'])
+        else:
+            assert(False)
         rawtxfund = self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': change, 'changePosition': 0})
         dec_tx  = self.nodes[2].decoderawtransaction(rawtxfund['hex'])
         out = dec_tx['vout'][0];