Testing defaults unnecessary?

Testing defaults unnecessary?

I'm currently going through some tests, updating them for a new QUnit
feature. While at it, I noticed that at least a few testsuites check
that an initialized element has the correct defaults, replicating
defaults within the test. Considering that there isn't really much
that can go wrong with setting defaults (abstracted into widget
factory), replicating all the defaults in the tests seems like a
double bad idea.
Any reason to keep those?
Jörn