[racket] plai test/exn

From: John Clements (clements at brinckerhoff.org)
Date: Mon Sep 19 17:59:32 EDT 2011

On Sep 19, 2011, at 2:57 PM, Eric Dobson wrote:

> Also IIRC test/exn only works on errors raised using 'error' from
> PLAI, which is different from 'error' from racket/base.

Ooh, just saw that this was test/exn, not check/exn.  I retract my hasty comment!


> -Eric
> On Mon, Sep 19, 2011 at 2:49 PM, John Clements
> <clements at brinckerhoff.org> wrote:
>> On Sep 19, 2011, at 1:47 PM, Jeremy Kun wrote:
>>> Not sure if this is a bug, but it doesn't match the documentation here. It says test/exn only succeeds when the error is explicitly raised by the user, but I try something as simple as:
>>> "file1.rkt"
>>> (provide foo)
>>> (define (foo) (error "hello"))
>>> "file2.rkt"
>>> (require plai "file1.rkt")
>>> (test/exn (foo) "hello")
>>> and the test fails with "no expected value". I can even replace "hello" with a call to error, and see that that argument is never evaluated. So by user-written code, I'm assuming they mean code contained in the same module. Or am I missing something fundamental about Racket's idea of "user-written code"?
>> Just a quick look, but it looks like you're failing to thunk the arguments to test/exn, so it never even gets control.
>> John
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