containsAll
Check that an array contains all specified values. Returns true only if all are present.
Examples
Ensure both root and ec2-user exist:
users.map(name).containsAll(["root","ec2-user"])
Example output:
users.map(name).containsAll(["root","ec2-user"])
[failed] [].containsAll()
  expected: == []
  actual:   [
    0: "ec2-user"
  ]