(load "Test.carp")

(use-all Test IO Result)

(defn open-existing-file? [filename]
  (let [f (open-file filename "r")]
    (match f
           (Error _) false
           (Success x) (do
                         (fclose! x)
                         true))))

(deftest test
  (assert-true test
               (error? &(open-file "asfasdfafs.txt" "r"))
               "An error is given when the file doesn't exist")
  (assert-true test
               (open-existing-file? "test/system.carp")
               "files that exist are opened properly"))