anchor.diff:  
   (defgeneric map-test-suites (function)
     (:method (function)
  -    (map-tests (coerce function 'function) suite))
  +    (map-test-suites (coerce function 'function)))
     (:method ((function function))
  -    (map-objects fn (find-class 'test-suite))))
  +    (map-objects function (find-class 'test-suite))))
   
   
   (defgeneric add-test (test suite)
     (:method ((test test) (suite test-suite))
  -    (register-object test suite)))
  +    (with-lock-held ((%test-suite-test-lock suite)) 
  +      (register-object test suite))))
   
   (defgeneric remove-test (test suite)
     (:method ((test test) (suite test-suite))
  -    (remove-object test suite)))
  +    (with-lock-held ((%test-suite-test-lock suite)) 
  +      (remove-object test suite))))
   
   (defgeneric find-test (name suite &optional errorp)
     (:method ((name symbol) (suite test-suite) &optional (errorp t))
  -    (find-object name suite errorp)))
  +    (with-lock-held ((%test-suite-test-lock suite)) 
  +      (find-object name suite errorp))))
   
   (defgeneric map-tests (function suite)
     (:method (function (suite test-suite))
  -    (map-objects function suite)))
  +    (with-lock-held ((%test-suite-test-lock suite)) 
  +      (map-objects function suite))))
  
positive.code: 
  
  (defgeneric %test-suite-tests (suite))
  
  (defgeneric test-suite-default-test-class (suite))
  (defgeneric (setf test-suite-default-test-class) (new-value suite))
  
negative.code:   ((%tests
      :reader %test-suite-tests
      :initform (make-hash-table :test #'eq))
     (%tests-lock
      ;; NB: The TEST-SUITE registry functions will use a lock contained
      ;; in the the class TEST-SUITE, when accessing the global, top
      ;; level registry for test suites.
      ;;
      ;; This slot provides a lock for test registry within any single
      ;; test suite.
      :reader %test-suite-test-lock
      :initform (make-lock "%tests-lock"))
     (default-test-class
         :initarg :default-test-class
       :initform (find-class 'lisp-test)
       :type class-designator 
       :accessor test-suite-default-test-class))
    (:metaclass associative-class)
    (:key-slot . mcicl.utils::name)
    (:default-initargs :key-function #'object-name))
  
  
  