Comparing collection contents with ScalaTest

Question

I'm trying to unit-test some Scala that is very collection-heavy. These collections are returned as Iterable[T], so I am interested in the contents of the collection, even if the underlying types differ. This is actually two related problems:

1. How do I assert that two ordered collections contain the same sequence of elements?
2. How do I assert that two unordered collections contain the same set of elements?

In summary, I'm looking the Scala-equivalent of NUnit's CollectionAssert.AreEqual (ordered) and CollectionAssert.AreEquivalent (unordered) in ScalaTest:

Set(1, 2) should equal (List(1, 2))          // ordered, pass
Iterable(2, 1) should equal (Iterable(1, 2)) // unordered, pass