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|
open QCheck
open STM
module type S = sig
type elt
type t
val empty : unit -> t
val mem : elt -> t -> bool
val add : elt -> t -> unit
val cardinal : t -> int
end
module Lib : sig
module Make : functor (Ord : Set.OrderedType) -> S with type elt = Ord.t
end
= struct
module Make (Ord : Set.OrderedType) =
struct
module S = Set.Make (Ord)
type elt = Ord.t
type t = {
mutable content : S.t;
mutable cardinal : int }
let empty () = { content = S.empty; cardinal = 0 }
let mem a t = S.mem a t.content
let add a t =
if not (mem a t)
then begin
t.content <- S.add a t.content;
t.cardinal <- t.cardinal + 1
end
let cardinal t = t.cardinal
end
end
module Lib_spec : Spec = struct
module S = Lib.Make (Int)
type sut = S.t
let init_sut () = S.empty ()
let cleanup _ = ()
type cmd =
| Mem of int
| Add of int
| Cardinal [@@deriving show { with_path = false }]
let run cmd sut =
match cmd with
| Mem i -> Res (bool, S.mem i sut)
| Add i -> Res (unit, S.add i sut)
| Cardinal -> Res (int, S.cardinal sut)
type state = int list
let init_state = []
let next_state cmd state =
match cmd with
| Mem _ -> state
| Add i -> if List.mem i state then state else i :: state
| Cardinal -> state
let precond _cmd _state = true
let postcond cmd state res =
match cmd, res with
| Mem i, Res ((Bool,_), b) -> b = List.mem i state
| Cardinal, Res ((Int,_), l) -> l = List.length state
| Add _, Res ((Unit,_),_) -> true
| _ -> false
let arb_cmd _state =
QCheck.make ~print:show_cmd
(QCheck.Gen.oneof
[Gen.return Cardinal;
Gen.map (fun i -> Mem i) Gen.int;
Gen.map (fun i -> Add i) Gen.int;
])
end
module Lib_sequential = STM_sequential.Make(Lib_spec)
let _ =
QCheck_base_runner.run_tests ~verbose:true
[Lib_sequential.agree_test ~count:100 ~name:"STM sequential tests"]
|
