test-suite/tests/hooks.test

   1 ;;;; hooks.test --- tests guile's hooks implementation  -*- scheme -*-
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  42
  43 ;;;
  44 ;;; miscellaneous
  45 ;;;
  46
  47 ;; FIXME:  Maybe a standard wrong-num-arg exception should be thrown instead
  48 ;; of a misc-error?  If so, the tests should be changed to expect failure.
  49 (define exception:wrong-num-hook-args
  50   (cons 'misc-error "Hook .* requires .* arguments"))
  51
  52 ;;;
  53 ;;; {The tests}
  54 ;;;
  55
  56 (let  ((proc1 (lambda (x) (+ x 1)))
  57        (proc2 (lambda (x) (- x 1)))
  58        (bad-proc (lambda (x y) #t)))
  59   (with-test-prefix "hooks"
  60    (pass-if "make-hook"
  61      (make-hook 1)
  62      #t)
  63
  64    (pass-if "add-hook!"
  65      (let ((x (make-hook 1)))
  66        (add-hook! x proc1)
  67        (add-hook! x proc2)
  68        #t))
  69
  70    (with-test-prefix "add-hook!"
  71                      (pass-if "append"
  72                               (let ((x (make-hook 1)))
  73                                 (add-hook! x proc1)
  74                                 (add-hook! x proc2 #t)
  75                                 (eq? (cadr (hook->list x))
  76                                      proc2)))
  77                      (pass-if-exception "illegal proc"
  78                        exception:wrong-type-arg
  79                        (let ((x (make-hook 1)))
  80                          (add-hook! x bad-proc)))
  81                      (pass-if-exception "illegal hook"
  82                        exception:wrong-type-arg
  83                        (add-hook! '(foo) proc1)))
  84    (pass-if "run-hook"
  85             (let ((x (make-hook 1)))
  86               (add-hook! x proc1)
  87               (add-hook! x proc2)
  88               (run-hook x 1)
  89               #t))
  90   (with-test-prefix "run-hook"
  91                     (pass-if-exception "bad hook"
  92                       exception:wrong-type-arg
  93                       (let ((x (cons 'a 'b)))
  94                         (run-hook x 1)))
  95                     (pass-if-exception "too many args"
  96                       exception:wrong-num-hook-args
  97                       (let ((x (make-hook 1)))
  98                         (add-hook! x proc1)
  99                         (add-hook! x proc2)
 100                         (run-hook x 1 2)))
 101
 102                     (pass-if
 103                      "destructive procs"
 104                      (let ((x (make-hook 1))
 105                            (dest-proc1 (lambda (x)
 106                                          (set-car! x
 107                                                    'i-sunk-your-battleship)))
 108                            (dest-proc2 (lambda (x) (set-cdr! x 'no-way!)))
 109                            (val '(a-game-of battleship)))
 110                        (add-hook! x dest-proc1)
 111                        (add-hook! x dest-proc2 #t)
 112                        (run-hook x val)
 113                        (and (eq? (car val) 'i-sunk-your-battleship)
 114                             (eq? (cdr val) 'no-way!)))))
 115
 116   (with-test-prefix "remove-hook!"
 117                     (pass-if ""
 118                              (let ((x (make-hook 1)))
 119                                (add-hook! x proc1)
 120                                (add-hook! x proc2)
 121                                (remove-hook! x proc1)
 122                                (not (memq proc1 (hook->list x)))))
 123                     ; Maybe it should error, but this is probably
 124                     ; more convienient
 125                     (pass-if "empty hook"
 126                       (let ((x (make-hook 1)))
 127                         (remove-hook! x proc1)
 128                         #t)))
 129   (pass-if "hook->list"
 130            (let ((x (make-hook 1)))
 131              (add-hook! x proc1)
 132              (add-hook! x proc2)
 133              (and (memq proc1 (hook->list x))
 134                   (memq proc2 (hook->list x))
 135                   #t)))
 136   (pass-if "reset-hook!"
 137            (let ((x (make-hook 1)))
 138              (add-hook! x proc1)
 139              (add-hook! x proc2)
 140              (reset-hook! x)
 141              (null? (hook->list x))))
 142   (with-test-prefix "reset-hook!"
 143                     (pass-if "empty hook"
 144                              (let ((x (make-hook 1)))
 145                                (reset-hook! x)
 146                                #t))
 147                     (pass-if-exception "bad hook"
 148                       exception:wrong-type-arg
 149                       (reset-hook! '(a b))))))