Test for updating host ENR from config value in Host

Author: gumb0

libp2p/Host.h

@@ -368,7 +368,7 @@ class Host: public Worker
     /// Alias for network communication.
     KeyPair m_alias;
     /// Host's Ethereum Node Record restored from network.rlp
-    ENR m_restoredENR;
+    ENR const m_restoredENR;
     std::shared_ptr<NodeTable> m_nodeTable;									///< Node table (uses kademlia-like discovery).
     mutable std::mutex x_nodeTable;
     std::shared_ptr<NodeTable> nodeTable() const { Guard l(x_nodeTable); return m_nodeTable; }

test/unittests/libp2p/peer.cpp

@@ -238,6 +238,23 @@ BOOST_AUTO_TEST_CASE(saveENR)
     BOOST_REQUIRE(enr1.signature() == enr2.signature());
 }
 
+BOOST_AUTO_TEST_CASE(updateENRfromConfig)
+{
+    NetworkConfig config("", "", 30303, false);
+    Host host1("Test", config);
+    ENR enr1 = host1.enr();
+
+    bytes store(host1.saveNetwork());
+
+    NetworkConfig config2("13.74.189.148", "", 30303, false);
+    Host host2("Test", config2, bytesConstRef(&store));
+    host2.start();
+    host2.stop();
+    ENR enr2 = host2.enr();
+
+    BOOST_REQUIRE_EQUAL(enr2.sequenceNumber(), enr1.sequenceNumber() + 1);
+    BOOST_REQUIRE_EQUAL(enr2.ip(), bi::address::from_string("13.74.189.148"));
+}
 
 BOOST_AUTO_TEST_SUITE_END()