[rspec-users] Comparing two XML documents

Kam Dahlin haxie1 at me.com
Wed Jan 26 14:19:45 EST 2011

Aaron Patterson (author of Nokogiri) addressed this issue directly here:  http://rubyforge.org/pipermail/nokogiri-talk/2009-April/000258.html
I don't think document comparison was ever implemented in Nokogiri though.


On Jan 26, 2011, at 7:26 AM, Matt Wynne wrote:

> I have a problem. I have a test that needs to assert that one XML document looks exactly like another XML document.
> I couldn't find a way to compare them as Nokogiri::XML::Documents, so I converted them both to strings with #to_xml and compared the strings.
> Trouble is, sometimes the attributes one of the nodes are rendered into the string in a different order to the other one, so you get an error of the form:
>    Diff:
>    @@ -5,7 +5,7 @@
>        <Description/>
>        <Context>
>          <BackgroundLabels>
>    -        <Label mode="FILTER" name="included"/>
>    +        <Label name="included" mode="FILTER"/>
>          </BackgroundLabels>
>        </Context>
>        <LookAndFeel nonprofit="false"/>
>    (RSpec::Expectations::ExpectationNotMetError)
> Most annoying.
> I've seen a couple of RSpec matchers in blog posts that walk and compare XML fragments but I'm surprised there isn't something more concrete that already exists. I feel like I'm missing a way to do it within an XML library, for example.
> Any clues out there?
> cheers,
> Matt
> matt at mattwynne.net
> 07974 430184
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