rpc: Assert that RPCArg names are equal to CRPCCommand ones (mining)

test/functional/rpc_generate.py

@@ -17,7 +17,8 @@ class RPCGenerateTest(BitcoinTestFramework):
 
     def run_test(self):
         message = (
-            "generate ( nblocks maxtries ) has been replaced by the -generate "
+            "generate\n"
+            "has been replaced by the -generate "
             "cli option. Refer to -help for more information."
         )