(**************************************************************************)
(* The OUnit library                                                      *)
(*                                                                        *)
(* Copyright (C) 2002-2008 Maas-Maarten Zeeman.                           *)
(* Copyright (C) 2010 OCamlCore SARL                                      *)
(* Copyright (C) 2013 Sylvain Le Gall                                     *)
(*                                                                        *)
(* The package OUnit is copyright by Maas-Maarten Zeeman, OCamlCore SARL  *)
(* and Sylvain Le Gall.                                                   *)
(*                                                                        *)
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(* a copy of this document and the OUnit software ("the Software"), to    *)
(* deal in the Software without restriction, including without limitation *)
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(* sublicense, and/or sell copies of the Software, and to permit persons  *)
(* to whom the Software is furnished to do so, subject to the following   *)
(* conditions:                                                            *)
(*                                                                        *)
(* The above copyright notice and this permission notice shall be         *)
(* included in all copies or substantial portions of the Software.        *)
(*                                                                        *)
(* The Software is provided ``as is'', without warranty of any kind,      *)
(* express or implied, including but not limited to the warranties of     *)
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(* In no event shall Maas-Maarten Zeeman be liable for any claim, damages *)
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(*                                                                        *)
(* See LICENSE.txt for details.                                           *)
(**************************************************************************)


(* Check environment after and before tests, to check isolation. *)

open OUnitTest
open OUnitAssert

type t =
  {
    pwd: string;
    env: string array;
  }

let create () = 
  {
    pwd = Sys.getcwd ();
    env = Unix.environment ();
  }

module EnvElement =
struct
  type t = string

  let pp_printer = Format.pp_print_string

  let compare = String.compare

  let pp_print_sep = OUnitDiff.pp_comma_separator 
end

module SetEnv = OUnitDiff.SetMake(EnvElement) 

let check test_ctxt t = 
  let t' = create () in
    List.iter 
      (fun f -> non_fatal test_ctxt (fun _ -> f ()))
      [
        (fun () ->
           assert_equal 
             ~msg:"Current working dir (check env)."
             ~printer:(fun s -> s)
             t.pwd
             t'.pwd);
        (fun () ->
           let convert t = SetEnv.of_list (Array.to_list t.env) in
             SetEnv.assert_equal 
               ~msg:"Environment (check env)."
               (convert t)
               (convert t'));
      ]
