diff --git a/src/gui/interact/invocation-trail.hpp b/src/gui/interact/invocation-trail.hpp
index 1d585475c..de4e27532 100644
--- a/src/gui/interact/invocation-trail.hpp
+++ b/src/gui/interact/invocation-trail.hpp
@@ -104,6 +104,12 @@ namespace interact {
           return GenNode(cmdID_, RESERVED_FOR_FUTURE_USE_);
         }
       
+      string
+      getID()  const
+        {
+          return cmdID_;
+        }
+      
       operator string()  const
         {
           return "InvocationTrail cmd(\""+cmdID_+"\"";
diff --git a/tests/gui/bus-term-test.cpp b/tests/gui/bus-term-test.cpp
index e45196016..c3dd6426c 100644
--- a/tests/gui/bus-term-test.cpp
+++ b/tests/gui/bus-term-test.cpp
@@ -39,8 +39,10 @@ using lib::idi::BareEntryID;
 using gui::test::MockElm;
 using lib::diff::GenNode;
 using lib::diff::Rec;
+using lib::time::Time;
 using lib::time::TimeSpan;
 using lib::hash::LuidH;
+using lib::HashVal;
 //using util::contains;
 
 
@@ -175,7 +177,7 @@ namespace test {
       commandInvocation ()
         {
           MARK_TEST_FUN
-          auto cmd = gui::test::Nexus::prepareMockCmd<string, TimeSpan, LUID>();
+          auto cmd = gui::test::Nexus::prepareMockCmd<string, TimeSpan, HashVal>();
           
           MockElm mock("uiElm");
           
diff --git a/tests/gui/test/test-nexus.cpp b/tests/gui/test/test-nexus.cpp
index 3c2e4ff57..aac7a0b9c 100644
--- a/tests/gui/test/test-nexus.cpp
+++ b/tests/gui/test/test-nexus.cpp
@@ -400,6 +400,20 @@ namespace test{
   
   
   
+  bool
+  Nexus::canInvoke(Cmd cmd)
+  {
+    UNIMPLEMENTED ("verify the given command is already bound and ready for invocation");
+  }
+  
+  bool
+  Nexus::wasInvoked (Cmd cmd)
+  {
+    UNIMPLEMENTED ("verify the given command was indeed invoked at least once");
+  }
+  
+  
+  
   
   /**
    * @return a defunct BusTerm with up-link to [ZombieNexus]
diff --git a/tests/gui/test/test-nexus.hpp b/tests/gui/test/test-nexus.hpp
index 666530e66..2bb14e05e 100644
--- a/tests/gui/test/test-nexus.hpp
+++ b/tests/gui/test/test-nexus.hpp
@@ -93,9 +93,47 @@ namespace test{
       
       static void setCommandHandler (CommandHandler  =CommandHandler());
       static void setStateMarkHandler (StateMarkHandler  =StateMarkHandler());
+      
+      
+      using Cmd = interact::InvocationTrail;
+      
+      template<typename...ARGS>
+      static Cmd prepareMockCmd();
+      
+      static bool canInvoke(Cmd);
+      static bool wasInvoked (Cmd);
+      
+      template<typename...ARGS>
+      static bool wasBound (Cmd, ARGS const& ...args);
+      
+      template<typename...ARGS>
+      static bool wasInvoked (Cmd, ARGS const& ...args);
     };
   
   
   
+  template<typename...ARGS>
+  inline interact::InvocationTrail
+  Nexus::prepareMockCmd()
+  {
+    UNIMPLEMENTED("pick up arbitrary types and fabricate a mock command accepting those types");
+  }
+  
+  template<typename...ARGS>
+  inline bool
+  Nexus::wasBound (Cmd cmd, ARGS const& ...args)
+  {
+    UNIMPLEMENTED("verify the denoted command was actually bound against the given concrete Arguments (String-match)");
+  }
+  
+  template<typename...ARGS>
+  inline bool
+  Nexus::wasInvoked (Cmd cmd, ARGS const& ...args)
+  {
+    UNIMPLEMENTED("verify the denoted command was indeed invoked and received the given concrete Arguments (String-match)");
+  }
+  
+  
+  
 }} // namespace gui::test
 #endif /*GUI_TEST_TEST_NEXUS_H*/