diff --git a/src/lib/diff/test-mutation-target.hpp b/src/lib/diff/test-mutation-target.hpp
index 4940d632b..b0ee081f2 100644
--- a/src/lib/diff/test-mutation-target.hpp
+++ b/src/lib/diff/test-mutation-target.hpp
@@ -47,6 +47,7 @@
 
 #include "lib/error.hpp"
 #include "lib/symbol.hpp"
+#include "lib/iter-adapter-stl.hpp"
 #include "lib/diff/record.hpp"
 #include "lib/diff/tree-mutator.hpp"
 #include "lib/idi/genfunc.hpp"
@@ -267,6 +268,15 @@ namespace diff{
         }
       
       
+      using const_iterator = typename iter_stl::_SeqT<const VecS>::Range;
+      
+      const_iterator begin() const { return iter_stl::eachElm(content_); }
+      const_iterator end()   const { return const_iterator(); }
+      
+      friend const_iterator begin (TestMutationTarget const& target) { return target.begin(); }
+      friend const_iterator end   (TestMutationTarget const& target) { return target.end(); }
+      
+      
     private:
     };
   
diff --git a/tests/library/diff/tree-manipulation-binding-test.cpp b/tests/library/diff/tree-manipulation-binding-test.cpp
index e4e2fd574..bdd26517a 100644
--- a/tests/library/diff/tree-manipulation-binding-test.cpp
+++ b/tests/library/diff/tree-manipulation-binding-test.cpp
@@ -28,6 +28,7 @@
 #include "lib/diff/test-mutation-target.hpp"
 #include "lib/time/timevalue.hpp"
 #include "lib/format-cout.hpp"
+#include "lib/format-util.hpp"
 #include "lib/util.hpp"
 
 //#include <utility>
@@ -107,6 +108,7 @@ namespace test{
       void
       mutateDummy()
         {
+          MARK_TEST_FUN;
           TestMutationTarget target;
           auto mutator =
           TreeMutator::build()
@@ -119,6 +121,25 @@ namespace test{
           CHECK (target.contains("α = 1"));
           CHECK (target.verifyEvent("injectNew","α = 1")
                        .after("attachMutator"));
+          
+          mutator.injectNew (ATTRIB3);
+          mutator.injectNew (ATTRIB3);
+          mutator.injectNew (CHILD_B);
+          mutator.injectNew (CHILD_B);
+          mutator.injectNew (CHILD_T);
+          CHECK (target.verify("attachMutator")
+                       .beforeEvent("injectNew","α = 1")
+                       .beforeEvent("injectNew","γ = 3.45")
+                       .beforeEvent("injectNew","γ = 3.45")
+                       .beforeEvent("injectNew","b")
+                       .beforeEvent("injectNew","b")
+                       .beforeEvent("injectNew","78:56:34.012")
+                       );
+          cout << "Content after population; "
+               << util::join(target) <<endl;
+          cout << "____Mutation-Log______________\n"
+               << util::join(target.getLog(), "\n")
+               << "\n───╼━━━━━━━━━╾────────────────"<<endl;
         }