anchor.diff:                             :cl-ppcre :usocket :flexi-streams :bordeaux-threads
                              :cl-base64 :trivial-backtrace :puri :anaphora
                              :parenscript :trivial-garbage :iterate :metabang-bind
  -                           :cl-json :cl-containers)
  +                           :cl-json :cl-containers :metatilities-base :cl-cont)
     "All the libraries currently supported by the test-grid.")
   
   (defun clean-rt ()
  
positive.code:    convenient)
     5h
     Solution: files are stored in Google App Engine blob store.
   - run the tests on all the implementations available for us.
   - usocket test suite might need manual configuration,
     see their README. Distinguish the case 
  
negative.code:   ;; The test framework used: lift.
    (quicklisp:quickload :cl-containers-test)
    (run-lift-tests :cl-containers-test))
  
  (defmethod libtest ((library-name (eql :metatilities-base)))
    ;; The test framework used: lift.
    (quicklisp:quickload :metatilities-base-test)
    (run-lift-tests :metatilities-base-test))
  
  (defmethod libtest ((library-name (eql :cl-cont)))
    ;; The test framework used: rt.
    (clean-rt)
    (asdf:clear-system :cl-cont-test)
  
    (quicklisp:quickload :cl-cont-test)
    (funcall (intern (string '#:test-cont) :cl-cont-test)))
  
  (defun run-libtest (lib)
    (let* ((orig-std-out *standard-output*)
  