They were using a 'name' property which wasn't
being set in the data. Radios share the same name
attribute so they can get it from the parent
group.
Also includes fixes for tests where the original
API is used.
JSDOM doesn't implement the submit method on form
elements. It does have a submit method but this
just fires a 'not implemented' error.
We need to spy on form submissions fired by
clicking on the submit button but can't because
this event calls the submit method internally so
spying on `form.submit` doesn't work.
This adds a helper which spies on the internal
method that is actually called. When JSDOM
implements the submit method properly this should
be removed.
