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with-exception-handler experiment
From: |
Jérémy Korwin-Zmijowski |
Subject: |
with-exception-handler experiment |
Date: |
Tue, 8 Mar 2022 23:10:26 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 |
Hello Guilers,
Hope you are all fine and safe.
In the following code, I have a test which should check if my result is
correct.
If you change the expected string value "1 run, 1 failed" the assert
procedure does not throw.
What happen ? The doc about *with-exception-handler* say things about
unwinding, dynamic environment, continuation of the error… Which I
barely understand. And here I guess I miss something.
;;;; code under test
(define runner
(let ([result '(0 0)])
(case-lambda
[() (lambda (proc) (run-and-count proc result) result)]
[(setup) (lambda (proc) (setup) (run-and-count proc result))]
[(setup teardown) (lambda (proc) (setup) (run-and-count proc
result) (teardown))])))
(define (run-and-count proc result)
(with-exception-handler
(lambda (e)
(list (1+ (car result)) (1+ (cadr result))))
(lambda ()
(proc)
(list (1+ (car result)) (cadr result)))
#:unwind? #t))
(define (summary result) (format #f "~A run, ~A failed" (car result)
(cadr result)))
;;;; tests
(import (rnrs))
(define (test-failed-result)
(let ([test-proc (lambda () (raise-exception (make-exception)))])
(define test-run (runner))
(define result (test-run test-proc))
(assert (string=? "1 run, 1 failed" (summary result)))))
(define run (runner))
(run test-failed-result)
--
Jérémy Korwin-Zmijowski
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- with-exception-handler experiment,
Jérémy Korwin-Zmijowski <=