(load "Test.carp")
(use-all IO Test)

(defn write-then-read [content file-name]
  (let [ written? (IO.write-file content file-name) ]
    (if (Result.error? &written?)
      (Result.unsafe-from-error written?)
      (let-do [ read? (IO.read-file file-name) ]
        (IO.Raw.unlink! file-name)
        (if (Result.error? &read?)
          (Result.unsafe-from-error   read?)
          (Result.unsafe-from-success read?)  )))))

(deftest test
  (assert-nothing test
                  &(IO.getenv "thisdoesnotexist")
                  "getenv works on non-existant variable"
  )
  (assert-just test
               &(IO.getenv "PATH")
               "getenv works on existant variable"
  )
  (let [ data "Icke\n\tdette\n\tkieke mal,\nOochen, Flesch und Beene." ]  ; include \n in test data!
    (assert-equal test
                  data
                  &(write-then-read data "io_carp_testdata.txt")  
                  "write-file then read-file"  ))
)