The document:
  ha:{nodes_for_testing} [root] entries: 11
   te:{0} {zero}
   te:{1} {one}
   te:{2} {two}
   te:{3} {three}
   te:{4} {four}
   te:{5} {five}
   te:{6} {six}
   te:{7} {seven}
   te:{8} {eight}
   te:{9} {nine}
   te:{10} {ten}
-
Node with key "0":
  te:{0} {zero}
-
Node with invalid key:
  * node is NULL *
