(let [{: contains } (require :lib.contains)]
  (let [given "a list and an element it contains"
        should "returns true"
        expected true
        actual (contains [:apple :orange :pear] :apple)]
    (assert (= actual expected) (.. "Given " given " should " should)))
  (let [given "a list and an element it does not contain"
        should "returns false"
        expected false
        actual (contains [:apple :orange :pear] :gorilla)]
    (assert (= actual expected) (.. "Given " given " should " should))))