rspec users - Jul 2007 - Mocking Resolv::DNS?

Hello Rspecers,

I have a rails project where I am calling Resolv::DNS.open and then
using the block to check a domain name.

The code snippet in question is:

   domain = "mytest.com"
   Resolv::DNS.open do |dns|
     @mx = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
   end

I obviously want to stub this out, especially for speed but can''t
quite work out how.

I have done:
>From what I can tell, Resolv::DNS first is receiving :open and it will
then be yielding instances of Resolv::DNS to be using inside the
block.

So, my last unsuccessfull attempt at mocking this out is:

    @dns = mock(Resolv::DNS)
    Resolv::DNS.should_receive(:open).and_return([@dns])
    @dns.should_receive(:getresources).and_return("MX Record")

The errors I am getting are not about mocks receiving unexpected
messages.  The :open message mock gets called.  The second one (on
@dns.should_receive(:getresources) also does not complain.

But @mx in the above code ends up as nil, when I would think it should
end up as "MX Record".

Any pointers?

Regards

Mikel

--
http://www.blognow.com.au/q

On 7/24/07, Mikel Lindsaar <raasdnil at gmail.com>
wrote:
> Hello Rspecers,
>
> I have a rails project where I am calling Resolv::DNS.open and then
> using the block to check a domain name.
>
> The code snippet in question is:
>
>    domain = "mytest.com"
>    Resolv::DNS.open do |dns|
>      @mx = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
>    end
>
> I obviously want to stub this out, especially for speed but can''t
> quite work out how.
>
> I have done:
>
> >From what I can tell, Resolv::DNS first is receiving :open and it will
> then be yielding instances of Resolv::DNS to be using inside the
> block.
>
> So, my last unsuccessfull attempt at mocking this out is:
>
>     @dns = mock(Resolv::DNS)
>     Resolv::DNS.should_receive(:open).and_return([@dns])
>     @dns.should_receive(:getresources).and_return("MX Record")
>
> The errors I am getting are not about mocks receiving unexpected
> messages.  The :open message mock gets called.  The second one (on
> @dns.should_receive(:getresources) also does not complain.
>
> But @mx in the above code ends up as nil, when I would think it should
> end up as "MX Record".
>
> Any pointers?
>
> Regards
>
> Mikel
>
> --
> http://www.blognow.com.au/q
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>
I''m not sure if this will work, but try

Resolv::DNS.should_receive(:open).and_yield(@dns)

Pat

Thank you, works perfectly!

Regards

Mikel

On 7/24/07, Pat Maddox <pergesu at gmail.com>
wrote:
> On 7/24/07, Mikel Lindsaar <raasdnil at gmail.com> wrote:
> > Hello Rspecers,
> >
> > I have a rails project where I am calling Resolv::DNS.open and then
> > using the block to check a domain name.
> >
> > The code snippet in question is:
> >
> >    domain = "mytest.com"
> >    Resolv::DNS.open do |dns|
> >      @mx = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
> >    end
> >
> > I obviously want to stub this out, especially for speed but
can''t
> > quite work out how.
> >
> > I have done:
> >
> > >From what I can tell, Resolv::DNS first is receiving :open and it
will
> > then be yielding instances of Resolv::DNS to be using inside the
> > block.
> >
> > So, my last unsuccessfull attempt at mocking this out is:
> >
> >     @dns = mock(Resolv::DNS)
> >     Resolv::DNS.should_receive(:open).and_return([@dns])
> >     @dns.should_receive(:getresources).and_return("MX
Record")
> >
> > The errors I am getting are not about mocks receiving unexpected
> > messages.  The :open message mock gets called.  The second one (on
> > @dns.should_receive(:getresources) also does not complain.
> >
> > But @mx in the above code ends up as nil, when I would think it should
> > end up as "MX Record".
> >
> > Any pointers?
> >
> > Regards
> >
> > Mikel
> >
> > --
> > http://www.blognow.com.au/q
> > _______________________________________________
> > rspec-users mailing list
> > rspec-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/rspec-users
> >
>
> I''m not sure if this will work, but try
>
> Resolv::DNS.should_receive(:open).and_yield(@dns)
>
> Pat
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>