Allow unit tests to access additional CConnman members

that are otherwise private:
- CConnman::m_nodes
- CConnman::ConnectNodes()
- CConnman::AlreadyConnectedToAddress()

and update the #include headers per iwyu.

src/test/util/net.cpp

@@ -4,11 +4,15 @@
 
 #include <test/util/net.h>
 
-#include <chainparams.h>
-#include <node/eviction.h>
 #include <net.h>
 #include <net_processing.h>
+#include <netaddress.h>
 #include <netmessagemaker.h>
+#include <node/connection_types.h>
+#include <node/eviction.h>
+#include <protocol.h>
+#include <random.h>
+#include <serialize.h>
 #include <span.h>
 
 #include <vector>
@@ -98,6 +102,17 @@ bool ConnmanTestMsg::ReceiveMsgFrom(CNode& node, CSerializedNetMsg&& ser_msg) co
     return complete;
 }
 
+CNode* ConnmanTestMsg::ConnectNodePublic(PeerManager& peerman, const char* pszDest, ConnectionType conn_type)
+{
+    CNode* node = ConnectNode(CAddress{}, pszDest, /*fCountFailure=*/false, conn_type, /*use_v2transport=*/true);
+    if (!node) return nullptr;
+    node->SetCommonVersion(PROTOCOL_VERSION);
+    peerman.InitializeNode(*node, ServiceFlags(NODE_NETWORK | NODE_WITNESS));
+    node->fSuccessfullyConnected = true;
+    AddTestNode(*node);
+    return node;
+}
+
 std::vector<NodeEvictionCandidate> GetRandomNodeEvictionCandidates(int n_candidates, FastRandomContext& random_context)
 {
     std::vector<NodeEvictionCandidate> candidates;

src/test/util/net.h

@@ -6,16 +6,30 @@
 #define BITCOIN_TEST_UTIL_NET_H
 
 #include <compat/compat.h>
-#include <node/eviction.h>
-#include <netaddress.h>
 #include <net.h>
+#include <net_permissions.h>
+#include <net_processing.h>
+#include <netaddress.h>
+#include <node/connection_types.h>
+#include <node/eviction.h>
+#include <sync.h>
 #include <util/sock.h>
 
+#include <algorithm>
 #include <array>
 #include <cassert>
+#include <chrono>
+#include <cstdint>
 #include <cstring>
 #include <memory>
 #include <string>
+#include <unordered_map>
+#include <vector>
+
+class FastRandomContext;
+
+template <typename C>
+class Span;
 
 struct ConnmanTestMsg : public CConnman {
     using CConnman::CConnman;
@@ -25,6 +39,12 @@ struct ConnmanTestMsg : public CConnman {
         m_peer_connect_timeout = timeout;
     }
 
+    std::vector<CNode*> TestNodes()
+    {
+        LOCK(m_nodes_mutex);
+        return m_nodes;
+    }
+
     void AddTestNode(CNode& node)
     {
         LOCK(m_nodes_mutex);
@@ -56,6 +76,11 @@ struct ConnmanTestMsg : public CConnman {
 
     bool ReceiveMsgFrom(CNode& node, CSerializedNetMsg&& ser_msg) const;
     void FlushSendBuffer(CNode& node) const;
+
+    bool AlreadyConnectedPublic(const CAddress& addr) { return AlreadyConnectedToAddress(addr); };
+
+    CNode* ConnectNodePublic(PeerManager& peerman, const char* pszDest, ConnectionType conn_type)
+        EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
 };
 
 constexpr ServiceFlags ALL_SERVICE_FLAGS[]{