Add "listener registration" test to test passing "this" out of a managed class

test/tests.cpp

@@ -124,6 +124,30 @@ void test_multi_construct_from_raw_pointers()
     }
 }
 
+struct EventListener;
+static std::vector<rcp<EventListener>> g_listeners;
+
+struct EventListener
+{
+    rcp_managed_root(EventListener);
+public:
+    int events_received = 0;
+    void attach() { g_listeners.push_back(this); }
+};
+
+void test_listener_self_registration()
+{
+    g_listeners.clear();
+    auto a = EventListener::create();
+    auto b = EventListener::create();
+    a->attach();
+    b->attach();
+    for (auto & l : g_listeners) l->events_received++;
+    assert(a->events_received == 1);
+    assert(b->events_received == 1);
+    g_listeners.clear();
+}
+
 void test_copy_assignment_decrements_previous_reference()
 {
     MyB myb = MyB::create(12, 13);
@@ -272,6 +296,7 @@ int main(int argc, char * argv[])
     test_booleans();
     test_create();
     test_multi_construct_from_raw_pointers();
+    test_listener_self_registration();
     test_copy_assignment_decrements_previous_reference();
     test_cross_type_comparison();
     test_reset();