open Core.Std
open OUnit2
open Anagram

let ae exp got _test_ctxt =
  let printer = List.to_string ~f:String.to_string in
  assert_equal exp got ~cmp:(List.equal ~equal:String.equal) ~printer

let tests = [
  "no matches" >::
    ae [] (anagrams "diaper" ["hello"; "world"; "zombies"; "pants"]);
  "detects simple anagram" >::
    ae ["tan"] (anagrams "ant" ["tan"; "stand"; "at"]);
  "does not detect false positives" >::
    ae [] (anagrams "galea" ["eagle"]);
  "detects multiple anagrams" >::
    ae ["stream"; "maters"] (anagrams "master" ["stream"; "pigeon"; "maters"]);
  "does not detect anagram subsets" >::
    ae [] (anagrams "good" ["dog"; "goody"]);
  "detects anagram" >::
    ae ["inlets"] (anagrams "listen" ["enlists"; "google"; "inlets"; "banana"]);
  "detects multiple anagrams" >::
    ae ["gallery"; "regally"; "largely"] (anagrams "allergy" ["gallery"; "ballerina"; "regally"; "clergy"; "largely"; "leading"]);
  "does not detect identical words" >::
    ae ["cron"] (anagrams "corn" ["corn"; "dark"; "Corn"; "rank"; "CORN"; "cron"; "park"]);
  "does not detect non-anagrams with identical checksum" >::
    ae [] (anagrams "mass" ["last"]);
  "detects anagrams case-insensitively" >::
    ae ["Carthorse"] (anagrams "Orchestra" ["cashregister"; "Carthorse"; "radishes"]);
  "detects anagrams using case-insensitive subject" >::
    ae ["carthorse"] (anagrams "Orchestra" ["cashregister"; "carthorse"; "radishes"]);
  "detects anagrams using case-insensitive possible matches" >::
    ae ["Carthorse"] (anagrams "orchestra" ["cashregister"; "Carthorse"; "radishes"]);
  "does not detect a word as its own anagram" >::
    ae [] (anagrams "banana" ["Banana"]);
  "does not detect a anagram if the original word is repeated" >::
    ae [] (anagrams "go" ["go Go GO"]);
  "anagrams must use all letters exactly once" >::
    ae [] (anagrams "tapper" ["patter"]);
  "capital word is not own anagram" >::
    ae [] (anagrams "BANANA" ["Banana"]);
]

let () =
  run_test_tt_main ("anagrams tests" >::: tests)