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Test::Unit and drb

Vassilis Rizopoulos

11/30/2006 2:06:00 PM

Anybody have any tips to share about unit testing code that uses drb?

My problem is, I can test all the the logic in smaller chunks, but as
soon as I integrate everyhting and have code in place that verifies and
recovers from connection errors I need to at least establish that drb
connection.

How would I go about doing this in a unit test environment?
Getting a mock drb server in a thread and launching it in setup seems
too clunky.
Any brilliant ideas?
Cheers,
V.-
--
http://www.braveworl...
3 Answers

Farrel Lifson

11/30/2006 2:12:00 PM

0

On 30/11/06, Damphyr <damphyr@freemail.gr> wrote:
> Anybody have any tips to share about unit testing code that uses drb?
>
> My problem is, I can test all the the logic in smaller chunks, but as
> soon as I integrate everyhting and have code in place that verifies and
> recovers from connection errors I need to at least establish that drb
> connection.
>
> How would I go about doing this in a unit test environment?
> Getting a mock drb server in a thread and launching it in setup seems
> too clunky.
> Any brilliant ideas?
> Cheers,
> V.-
> --
> http://www.braveworl...
>
>

This is how I've done it though if anyone has better solutions I'd be
glad to hear them:

require 'drb'
require 'test/unit'

class Counter
def initialize;@counter = 0;end
def count;@counter+=1;end

def self.start
DRb.start_service("druby://localhost:9000",self.new)
end

def stop
DRb.stop_service
end
end

class TC_Counter < Test::Unit::TestCase
def setup
@t = Thread.new do
Counter.start
end
@counter = DRbObject.new_with_uri("druby://localhost:9000")
end

def teardown
@counter.stop
@t.exit
end

def test_count
assert_equal(1,@counter.count)
assert_equal(2,@counter.count)
assert_equal(3,@counter.count)
end
end

Eric Hodel

12/1/2006 1:58:00 AM

0

On Nov 30, 2006, at 0605 , Damphyr wrote:

> Anybody have any tips to share about unit testing code that uses drb?
>
> My problem is, I can test all the the logic in smaller chunks, but
> as soon as I integrate everyhting and have code in place that
> verifies and recovers from connection errors I need to at least
> establish that drb connection.

How is multiprocess operation (DRb dispatched) different from
multithreaded operation (method calls) for your program?

--
Eric Hodel - drbrain@segment7.net - http://blog.se...

I LIT YOUR GEM ON FIRE!

Vassilis Rizopoulos

12/1/2006 9:54:00 AM

0

Eric Hodel wrote:
> On Nov 30, 2006, at 0605 , Damphyr wrote:
>
>> Anybody have any tips to share about unit testing code that uses drb?
>>
>> My problem is, I can test all the the logic in smaller chunks, but as
>> soon as I integrate everyhting and have code in place that verifies
>> and recovers from connection errors I need to at least establish that
>> drb connection.
>
> How is multiprocess operation (DRb dispatched) different from
> multithreaded operation (method calls) for your program?
It's not, apart from the fact that the drb server might just not be
there, so I need to recover from network errors in some way.
I am testing everything before putting it together and I am testing
without a drb connection.
Thing is in one case I make two or three calls over drb and at the
moment I can only test what happens when the first call fails, but not
what happens when the connection goes away in between calls.
The whole scenario is more of an integration test and fitting it into
Test::Unit is a bit of a push.
Cheers,
V.-
--
http://www.braveworl...