Working flat JString sorta

testing/mstring_test.cpp

@@ -64,7 +64,9 @@ int main(int argc, char **argv) {
    coreutils::MString test21;
    test21 = test20;
    std::cout << "mstring = zstring: [" << test21 <<  "]" << std::endl;
-   
+   coreutils::MString test22;
+   test22 << test20;
+   std::cout << "mstring << zstring: [" << test22 <<  "]" << std::endl;
    
    return 0;
 }