package alcotest-lwt

Alcotest is a lightweight and colourful test framework.

Alcotest exposes simple interface to perform unit tests. It exposes a simple TESTABLE module type, a check function to assert test predicates and a run function to perform a list of unit -> unit test callbacks.

Alcotest provides a quiet and colorful output where only faulty runs are fully displayed at the end of the run (with the full logs ready to inspect), with a simple (yet expressive) query language to select the tests to run.

Examples

A simple example:

(* Build with `ocamlbuild -pkg alcotest simple.byte` *)

(* A module with functions to test *)
module To_test = struct
  let capit letter = Char.uppercase letter
  let plus int_list = List.fold_left (fun a b -> a + b) 0 int_list
end

(* The tests *)
let capit () =
  Alcotest.(check char) "same chars"  'A' (To_test.capit 'a')

let plus () =
  Alcotest.(check int) "same ints" 7 (To_test.plus [1;1;2;3])

let test_set = [
  "Capitalize" , `Quick, capit;
  "Add entries", `Slow , plus ;
]

(* Run it *)
let () =
  Alcotest.run "My first test" [
    "test_set", test_set;
  ]

The result is a self-contained binary which displays the test results. Use ./simple.byte --help to see the runtime options.

$ ./simple.native
[OK]        test_set  0   Capitalize.
[OK]        test_set  1   Add entries.
Test Successful in 0.001s. 2 tests run.

See the examples folder for more examples.