test: `addnode` with an invalid command should throw an error

test/functional/rpc_net.py

@@ -61,7 +61,7 @@ class NetTest(BitcoinTestFramework):
         self.test_getpeerinfo()
         self.test_getnettotals()
         self.test_getnetworkinfo()
-        self.test_getaddednodeinfo()
+        self.test_addnode_getaddednodeinfo()
         self.test_service_flags()
         self.test_getnodeaddresses()
         self.test_addpeeraddress()
@@ -203,8 +203,8 @@ class NetTest(BitcoinTestFramework):
         # Check dynamically generated networks list in getnetworkinfo help output.
         assert "(ipv4, ipv6, onion, i2p, cjdns)" in self.nodes[0].help("getnetworkinfo")
 
-    def test_getaddednodeinfo(self):
-        self.log.info("Test getaddednodeinfo")
+    def test_addnode_getaddednodeinfo(self):
+        self.log.info("Test addnode and getaddednodeinfo")
         assert_equal(self.nodes[0].getaddednodeinfo(), [])
         # add a node (node2) to node0
         ip_port = "127.0.0.1:{}".format(p2p_port(2))
@@ -218,6 +218,8 @@ class NetTest(BitcoinTestFramework):
         # check that node can be removed
         self.nodes[0].addnode(node=ip_port, command='remove')
         assert_equal(self.nodes[0].getaddednodeinfo(), [])
+        # check that an invalid command returns an error
+        assert_raises_rpc_error(-1, 'addnode "node" "command"', self.nodes[0].addnode, node=ip_port, command='abc')
         # check that trying to remove the node again returns an error
         assert_raises_rpc_error(-24, "Node could not be removed", self.nodes[0].addnode, node=ip_port, command='remove')
         # check that a non-existent node returns an error