test: Add test for missing and omitted required arg

Author: MarcoFalke

test/functional/rpc_invalid_address_message.py

@@ -95,15 +95,19 @@ def test_validateaddress(self):
         self.check_invalid(INVALID_ADDRESS, 'Not a valid Bech32 or Base58 encoding')
         self.check_invalid(INVALID_ADDRESS_2, 'Not a valid Bech32 or Base58 encoding')
 
+        node = self.nodes[0]
+
+        # Missing arg returns the help text
+        assert_raises_rpc_error(-1, "Return information about the given bitcoin address.", node.validateaddress)
+        # Explicit None is not allowed for required parameters
+        assert_raises_rpc_error(-3, "JSON value of type null is not of expected type string", node.validateaddress, None)
+
     def test_getaddressinfo(self):
         node = self.nodes[0]
 
         assert_raises_rpc_error(-5, "Invalid Bech32 address data size", node.getaddressinfo, BECH32_INVALID_SIZE)
-
         assert_raises_rpc_error(-5, "Not a valid Bech32 or Base58 encoding", node.getaddressinfo, BECH32_INVALID_PREFIX)
-
         assert_raises_rpc_error(-5, "Invalid prefix for Base58-encoded address", node.getaddressinfo, BASE58_INVALID_PREFIX)
-
         assert_raises_rpc_error(-5, "Not a valid Bech32 or Base58 encoding", node.getaddressinfo, INVALID_ADDRESS)
 
     def run_test(self):