Re: [Caml-list] Unit testing Core Async

[Kenneth Adam Miller <kennethadammiller@gmail.com>]

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Oh, as far as shutting the scheduler down, I just wanted the scheduler to
return from the go (); I need my unit tests to execute until completion but
afterward just finish. I think the solution you pointed me to was exactly
what I was looking for. :)

On Mon, Jun 15, 2015 at 12:56 PM, Kenneth Adam Miller <
kennethadammiller@gmail.com> wrote:

> That helps-I was literally looking up a way to running unit tests on that
> google group. I think that group helped a lot, I'll try and read what I can
> there before I blast the list (I didn't know about it before hand).
>
> On Mon, Jun 15, 2015 at 12:53 PM, Carl Eastlund <ceastlund@janestreet.com>
> wrote:
>
>> Internally at Jane Street -- and this may show up in some of the publicly
>> released code, but off the top of my head, I don't know what file to point
>> you at -- we run some of our async unit tests using
>> [Thread_safe.block_on_async_exn].  That will spin up the scheduler if
>> necessary, run the function you give it, block until the deferred is
>> determined, then return.  It does not shut down the async scheduler; we
>> generally don't do that until the program is done, so we would leave the
>> scheduler up from one test to another.  I don't know the entire rationale
>> behind this design, there may be a way to shut down the scheduler in
>> between tests, but in general it does not appear to be necessary.
>>
>> As for partial reads, if you're concerned with receiving whole messages,
>> I think [Reader.read_one_chunk_at_a_time] can do what you need -- if you
>> get too little, just return [`Consumed (n_already_consumed, `Need
>> n_total_bytes_to_proceed)].
>>
>> I hope this helps!
>>
>> On Mon, Jun 15, 2015 at 12:33 PM, Kenneth Adam Miller <
>> kennethadammiller@gmail.com> wrote:
>>
>>> I've noticed that Core Async requites that a Scheduler.go () call be
>>> placed-but that never returns. I have a Tcp.server that I'm creating, and I
>>> like to use oUnit for my tests. Monads and all are beautiful, and Core is a
>>> wonderful library, but I'm adamant that I have at least some minimal
>>> functionality testing complete that demonstrates proper behavior as well as
>>> intended usage.
>>>
>>> What I'm wondering is the following: would there be a way to have the
>>> scheduler.go call be placed in order to fire things off, but in another
>>> thread have all the test code be dependent on the server's responses and
>>> all of that, so that once completed, it can call Shutdown.shutdown?
>>>
>>> I tried this out, and it introduced some issues.
>>>
>>> First, I think that my shutdown call got executed before the unit test
>>> was able to complete. This is because using Async's Deferred introduces
>>> some complication if you want behavior to proceed sequentially as in
>>> without building deeply nested callback chains. What I'm used to is
>>> asynchronous send, and blocking receive that operates on a common execution
>>> chain. I don't see any kind of Deferred.await that blocks until the
>>> instance resolves (yes, there's upon, but that's just nesting again because
>>> it returns another deferred.
>>>
>>> Second, I think shutdown shuts *everything* down. What I need is just to
>>> signal the completion of the job that was supposed to run, so that the
>>> Scheduler.go returns in order to allow my unit tests to run to completion.
>>>
>>> Third, I'm not certain about the semantics of Pipe/Reader/Writer. It's
>>> not behaviorally like what I'm familiar with. For instance, callbacks may
>>> return prematurely and only have part of a message. In ZMQ, what you send
>>> is what you get. So that makes me concerned in regards to the Tcp.Server,
>>> because right now what I need is for the Pipe to just allow blocking
>>> receive so that I can make the threads coordinated, but I need the Tcp
>>> Server to allow me to receive whole protobuf messages.
>>>
>>> Can anyone please help me?
>>>
>>
>>
>>
>> --
>> Carl Eastlund
>>
>
>

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