Rails testing models

I'd like to test models working with each other. Something like this:

query = Query.new
user = users(:first)

assert_equal Query::STATUSES[:new], query.status

query.resend_to user.id

asser_equal Query::STATUSES[:resent], query.status
asser_equal 1, user.queries.size

But I even dont know, what is the right name for such kind of testing, scenario driven testing, behaviour driven testing?

Please, tell me how it's called and some examples.