test: check parameter validity in rpc_signmessage.py

checks parameter validity and error codes for the related RPCs:
    - signmessagewithprivkey
    - signmessage
    - verifymessage

Author: theStack

test/functional/rpc_signmessage.py

@@ -5,7 +5,10 @@
 """Test RPC commands for signing and verifying messages."""
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+)
 
 class SignMessagesTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -38,5 +41,22 @@ def run_test(self):
         assert not self.nodes[0].verifymessage(other_address, signature, message)
         assert not self.nodes[0].verifymessage(address, other_signature, message)
 
+        self.log.info('test parameter validity and error codes')
+        # signmessage(withprivkey) have two required parameters
+        for num_params in [0, 1, 3, 4, 5]:
+            param_list = ["dummy"]*num_params
+            assert_raises_rpc_error(-1, "signmessagewithprivkey", self.nodes[0].signmessagewithprivkey, *param_list)
+            assert_raises_rpc_error(-1, "signmessage", self.nodes[0].signmessage, *param_list)
+        # verifymessage has three required parameters
+        for num_params in [0, 1, 2, 4, 5]:
+            param_list = ["dummy"]*num_params
+            assert_raises_rpc_error(-1, "verifymessage", self.nodes[0].verifymessage, *param_list)
+        # invalid key or address provided
+        assert_raises_rpc_error(-5, "Invalid private key", self.nodes[0].signmessagewithprivkey, "invalid_key", message)
+        assert_raises_rpc_error(-5, "Invalid address", self.nodes[0].signmessage, "invalid_addr", message)
+        assert_raises_rpc_error(-5, "Invalid address", self.nodes[0].verifymessage, "invalid_addr", signature, message)
+        # malformed signature provided
+        assert_raises_rpc_error(-3, "Malformed base64 encoding", self.nodes[0].verifymessage, self.nodes[0].getnewaddress(), "invalid_sig", message)
+
 if __name__ == '__main__':
     SignMessagesTest().main()