[NUnitAsp-devl] Re: [Nunitasp-users] HtmlTag (and HtmlControlTester)

[Dave P. <n0n...@gm...>]

I've got a solution for this, though I may be using a class inappropriately=
.

Using the Strategy pattern (GOF), I factored out the strategy for
finding the tag for a tester.  I call this strategy a "locator" and I
created an interface IHtmlTagLocator, with one method: Locate( ),
which returns an HtmlTag.  I have a base class that derives from
HtmlControlTester and has a constructor that takes an IHtmlTagLocator
(among other things).  Then, I overloaded the Tag property, and use
the locator to get the HtmlTag.  Then I have two classes that
implement IHtmlTagLocator -- one for aspId, and one for XPath.

The benefit of doing it this way is that I can create all my custom
testers that are specialized for images, or whatever, and I don't have
to implement one using ID and the other using XPath.

One small problem is that I lied two paragraphs back.  Turns out b/c
of the current design, you can't create a  locator using AspId because
it's done by the tester base class.  Some refactoring of the base
classes is required for this to work, I think, and that may not be
deemed appropriate.  For now, I just call base.Tag if no locator was
specified.  But I think factoring the location out of the tester would
be a good thing, since testing the tag (mapping properties and such)
should not be affected by the method used to find it.

Anyway, just my $.02.

Dave
P.S. I think there's also a problem regarding detecting page updates.=20
It probably means more objects need to be sent to the XPathLocator
constructor (e.g. the HttpClient object)

On 5/23/05, Cory Foy <Cor...@mo...> wrote:
> Jim Shore wrote:
> > In order to enable NUnitAsp to test legacy code, I'm putting in a lot o=
f
> > new features.  Multiple forms are now supported, as is the ability to
> > emulate Javascript without writing a custom tester.  Next on the list i=
s
> > testers for HTML controls and testing HTML tags that don't have an ID.
> > XPath will probably be part of that, although I haven't decided for sur=
e.
> >
> > The current "no guarantees" release date for the next version is August
> > or September.
>=20
> XPath would be extremely helpful for testing Mobile Controls. Even using
> "ASP.NET to it's fullest" still the only way to use it to test Mobile
> Controls is by using XPath (and it isn't pretty XPath either).
>=20
> My first stab at working on the extension for mobile controls I stopped
> because I also couldn't figure out how to get it to use XPath. I was
> able to get all the way up to that point, but not quite.
>=20
> In my situation it's a little different in that, for mobile controls,
> you know the ID, and can relate it to a tag, but only by going through
> the value of another tag. Because some phones treat tags named the same
> as being the same (even if they are on different cards), ASP.NET uses a
> unique naming scheme which does something like:
>=20
> <wml>
>  <card>
>   <onevent type=3D"onenterforward">
>    <refresh><setvar name=3D"mcsv0" value=3D"" /></refresh>
>   </onevent>
>   <do type=3D"accept" label=3D"GO">
>    <go href=3D"mobileindex.aspx">
>     <postfield name=3D"__EVENTTARGET"
>        value=3D"_ctl2:cmdMasterPermitCollectorSubmit" />
>     <postfield name=3D"_ctl2:MasterPermitText"
>        value=3D"$(mcsv0)" />
>    </go>
>   </do>
>   <p>Master Permit Number<input name=3D"mcsv0" format=3D"*N" /></p>
>  </card>
> </wml>
>=20
> So you basically have to iterate through the postfield nodes looking for
> the value in the variable notation (in the above case $(mcsv0) and match
> that to the the server-side name. In addition, you have to iterate
> though the setvar nodes to see what the default value was coming into
> the page, and iterate though the input tags to match the assigned name
> to set the value.
>=20
> Sorry, that was the long answer. The short answer, I would *love* to see
> XPath support. :) Even if I had to do a lot of overriding to extend the
> classes, it would be helpful. I'd be willing to throw my hat in closer
> to the second week of July (maybe some time in June if I can get this
> current project finished up).
>=20
> Cory
>=20
>=20
>=20
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