From: Robert Dober <robert.dober@...>
Date: 2006-05-25T00:19:11+09:00
Subject: Re: Overriding Time.now

------=_Part_175514_19412308.1148483947821
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On 5/24/06, Molitor, Stephen L <Stephen.L.Molitor@erac.com> wrote:
>
> One caution:  I did what Robert suggested a while back.  It works
> perfectly, but does wreak havoc with Test::Unit and rake test times
> reporting.  Tests can appear to finish before they've started, etc.  I en=
ded
> up creating a CurrentTime class:
>
> class CurrentTime
>   @@now =3D nil
>
>   def now
>     @@now || Time.now
>   end
>
>   def now=3D(new_time)
>     @@now =3D new_time
>   end
> end
>
> I changed my code to use CurrentTime.now instead of Time.now.  Test::Unit=
,
> rake and friends still use Time.now, so they don't get messed up.  In my
> unit test I mock out the time by calling CurrentTime.now=3D.  Crude but i=
t
> works.


Yup you have to change the code to be tested, not the best idea.
I guess you can avoid this by redefining now only in the class to be tested=
,
please note I did not hang anybody (by not redefining Time.now) just gave
you the rope to hang yourself (by redefining Time.now).
Now (pun intended) I believe that you can redefine Time.now in the scope
where you need it without interfering with Test::Unit, well you are still
administring the code you test somehow.
Neverheless that might be the cleanest approach, I would be glad to have a
better one suggested though.

Cheers
Robert

Steve
>
> -----Original Message-----
> From: Robert MannI [mailto:robmnl@gmail.com]
> Sent: Wednesday, May 24, 2006 9:37 AM
> To: ruby-talk ML
> Subject: Re: Overriding Time.now
>
> Thanks alot Robert, that'll do it
>
>
>
> Rob
>
> On 5/24/06, Robert Dober <robert.dober@gmail.com> wrote:
> >
> > On 5/24/06, Robert MannI <robmnl@gmail.com> wrote:
> > >
> > > Hello!
> > >
> > > I have a unit test where I need to simulate a different system time.
> > >
> > > Hence I need Time.now to return a different time than now, say, now
> > > + 1 month
> > >
> > > How can I do this?
> > >
> > > I tried aliasing Time now, but I don't know how to alias class
> methods.
> > >
> > > class Time
> > > alias_method 'self.original_now', 'self.now'
> > > end
> > >
> > > How can I alias this --or-- is there any better way to simulate a
> > > different time on calling Time.now?
> > >
> > >
> > > Tips and ideas are greatly appreciated, Rob
> >
> >
> > Hi
> >
> > class Time
> >     class << self
> >         alias_method :n, :now
> >     end
> > end
> >
> > hope that helps
> > Cheers
> > Robert
> >
> >
> > --
> > Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qu=
i
> > concerne l'univers, je n'en ai pas acquis la certitude absolue.
> >
> > - Albert Einstein
> >
> >
>
>


--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

------=_Part_175514_19412308.1148483947821--