Add CConnmanTest to mutate g_connman in tests

src/net.h

@@ -431,6 +431,8 @@ private:
      *  in excess of nMaxOutbound
      *  This takes the place of a feeler connection */
     std::atomic_bool m_try_another_outbound_peer;
+
+    friend struct CConnmanTest;
 };
 extern std::unique_ptr<CConnman> g_connman;
 void Discover(boost::thread_group& threadGroup);

src/test/test_bitcoin.cpp

@@ -25,6 +25,18 @@
 
 #include <memory>
 
+void CConnmanTest::AddNode(CNode& node)
+{
+    LOCK(g_connman->cs_vNodes);
+    g_connman->vNodes.push_back(&node);
+}
+
+void CConnmanTest::ClearNodes()
+{
+    LOCK(g_connman->cs_vNodes);
+    g_connman->vNodes.clear();
+}
+
 uint256 insecure_rand_seed = GetRandHash();
 FastRandomContext insecure_rand_ctx(insecure_rand_seed);
 

src/test/test_bitcoin.h

@@ -49,6 +49,12 @@ struct BasicTestingSetup {
  * Included are data directory, coins database, script check threads setup.
  */
 class CConnman;
+class CNode;
+struct CConnmanTest {
+    static void AddNode(CNode& node);
+    static void ClearNodes();
+};
+
 class PeerLogicValidation;
 struct TestingSetup: public BasicTestingSetup {
     CCoinsViewDB *pcoinsdbview;