Source file `lwt_assert.ml`

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(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2020 Nomadic Labs. <contact@nomadic-labs.com>               *)
(*                                                                           *)
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(*****************************************************************************)

(** [lwt_assert] contains Alcotest assertions lifted to the Lwt. *)

open Assert

(** Lwt-lifted assertion that [b] is [true]. *)
let lwt_assert_true str b = Lwt.return (assert_true str b)

(** Lwt-lifted assertion that [b] is [false]. *)
let lwt_assert_false str b = Lwt.return (assert_false str b)

(** Lwt-lift of [Alcotest.check]. *)
let lwt_check testable str a b = Lwt.return (Alcotest.check testable str a b)

(** Lwt-lifted Alcotest version of [assert false]. *)
let lwt_impossible str = Lwt.return (impossible str)

(** [lwt_fail str] is a lwt-lifted Alcotest version of [Alcotest.fail str]. *)
let lwt_fail str = Lwt.return (Alcotest.fail str)

(** [lwt_assert_catch p e] runs [p], expecting to catch [e] and fails
    if [p] does not raise that exception *)
let lwt_assert_catch (p : unit -> 'a Lwt.t) (e : exn) =
  let catcher e' =
    Lwt.return (Alcotest.check Testable.exn "Catched unexpected assertion" e e')
  in
  Lwt.(
    let open Syntax in
    let* () = catch p catcher in
    lwt_fail ("Expected an exception " ^ Printexc.to_string e))