Fix xml tests

[gregoriokusowski]

The xml tests were able to pass even with wrong strings because is was receiving two string parameters instead of a single check. The second parameter is a message, so it was calling: (is form msg) instead of (is form)

[marceloboeira]

👏🏼

[weavejester]

Thanks for the fix. Could you amend your commit message to be in line with the repository? i.e. imperative mood for the summary with no ending period. So something like:

Fix parentheses in xml tests

I think you can also leave off the detailed explanation, since the problem and solution are obvious from the diff. :)

[gregoriokusowski]

There we go!

[weavejester]

Thanks! Merged.