Among its many built-in matchers, RSpec includes a set of array matchers. One of the array matchers is match_array which compares two arrays independent of ordering. This is handy if you need to check that a resulting array matches your expectations when ordering is unimportant and not necessarily deterministic. It can be used like so:

expect([1,2,3]).to match_array([3,2,1])

This expectation is met, the test will pass.