Tels ha scritto:
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Moin,
On Wednesday 02 November 2005 18:02, Marcello wrote:
Tels ha scritto:
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While this works mostly fine for ASCII, the HTML/SVG is undertested
because the text/code output can change quite radically, while still
rendering/representing the same graph. And of course I do want to
test that the end result is the right one, not that the generated
SVG/HTML code is a specific example.
If the output is valid xml, couldn't one "semantically" compare the
expected output and the actual output with something like
XML::SemanticDiff ?
Might be, but I am not generting XML, but HTML...
Valid XHTML is also valid XML.
But valid XHTML doesn't work well in the praxis. (It offers nothing what
HTML can't do, but creates more problems)
And it still doesn't solve the problem, because a:
* div with 1px border
* table cell with 1px border
look exactly in the browser, but have much different (X)HTML source.
Testing 'visual equivalency' of two ([x]html|svg|whatever) documents is
unfeasible IMHO. We need a compromise, like deciding to use a div or a
table to produce some visual effect.
This is required anyway, because while it's true that there are a dozen
ways to generate the same page, they will differ wildly on some relevant
aspects (e.g. browser compatibility, table- or css- based layout, etc.),
so you have to make a decision at some point and choose one.
And there are many ways to write code that looks visually the same,
and yet is wildly different. More so for, lets say SVG.
My point was that 'semantically' comparing XML data structures instead
of their ascii representations is an improvement.
Of course this doesn't take into account specific cases like SVG, where
you have 'semantically' different xml documents producing the same
(visual) output.
To address this specific case one would need a way to test the 'visual'
equivalence of two svg documents.
The same for HTML documents. Hm. Maybe one could convert them to PNG and
compare the outputs. But this is also hard. *thinks*
Interesting...
Best wishes,
Tels
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Marcello Romani
Developer
Spin s.r.l.
Reggio Emilia
http://www.spinsoft.it
