[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: XSLT Unit Testing and Coverage

Subject: Re: XSLT Unit Testing and Coverage
From: "BR Chrisman brchrisman@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 29 May 2014 07:11:38 -0000
Re:  XSLT Unit Testing and Coverage
On Wed, May 28, 2014 at 10:38 PM, Ihe Onwuka ihe.onwuka@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, May 28, 2014 at 8:38 PM, Ihe Onwuka <ihe.onwuka@xxxxxxxxx> wrote:
>> On Wed, May 28, 2014 at 7:57 PM, Vasudev Kandhadai
>> vasu.kandhadai@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>> Dear All,
>>> is there a good reason to deploy a XSLT unit testing framework?
>> No.
>>> I have never seen any serious XSLT dev env where the XSLT unit testing
>>> was either done religiously, or considered mandatory.  Other than a very
>>> religious Java development team with strict Junit set up with Maven etc,
>>> who have adopted XSLT into their dev env, who would now want to extend the
>>> same ideologies to the XSLT world?  I have personally never used or
>>> utilized practically any XSLT unit testing framework in any project and nor
>>> was there any requirement to do so...
>> Why is Java a valid reference point. It's a completely different language.
> Right. This merits amplification. The phrase "Unit Test Frameworks"  has
> acquired in my view a specific connotation related to ideas from Test
> Driven Development. They are a creature that evolved from the procedural
> programming community to solve problems that arise during the development
> of procedural programs.
> XSLT done right is declarative. The programmer does not have the same
> level of control over what processing (and therefore what tests) gets done
> when. So before adopting a methodology founded on "Unit testing frameworks"
> the first question I would ask is - in XSLT what should constitute a unit -
> or to put it more finely what is the smallest component that should be the
> subject of a discrete testing effort.
> Is it a stylesheet. I don't think so, at least not if you are coding
> declaratively. How would I think about it. Well what is more useful on a
> bug report - that there is a bug on stylesheet X, or that  executing tests
> targeted at template Y in stylesheet X exposed a bug.  So I would say the
> focus on testing an XSLT program should be at the template rule level and
> if I were to adopt any sort of test driven methodology it might evolve
> around the concept of the template rule as a unit (with all that entails).
>  That however is  a big if.

If everything needed to test a particular template could be assembled, and
the template's name is passed in as initial template... then there's
mocking calls like the various input/output doc stuff... and parameters to
the template...  But it sounds like a lot of the tools out there do this
already, like: "show me only the nodes resulting from this template".

I can see how that might be useful... all my xslt projects have been
implemented as series of small stylesheets applied in a layering/pipeline,
so I'd generally achieve mostly the same thing by isolating a template (or
a few templates) in a particular layer/stage and using a 'tee' type
utility... (works for identity-based transforms).

I'm thinking for my next such project, having a stylesheet transform the
source stylesheet, adding a debug namespace and instructions to add debug
namespace elements to the result nodes of specific templates, so I can
track the output of those without having to isolate.

>  If someone were to sit down and design from scratch a testing methodology
> acclimated to XSLT in particular and declarative programming in general it
> would not look like nUnit. The efficacy of these testing methodologies is
> oversold. Similar benefits would accrue to any effort that entailed the
> automation of test execution. What nUnit has done is increase the number of
> programmers that are willing to be involved in testing by turning it into a
> programming activity and that has a knock on beneficial effect especially
> in the paradigm from which these methods evolved.
>   XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
> EasyUnsubscribe <-list/965995> (by
> email <>)

Current Thread


Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.