package alcotest

  1. Overview
  2. Docs
Alcotest is a lightweight and colourful test framework

Install

Dune Dependency

github.com Readme Changelog ISC License Edit opam file Versions (41)

Authors

  1. T
    Thomas Gazagnaire

Maintainers

  1. T
    thomas@gazagnaire.org

Sources

alcotest-mirage-1.2.2.tbz
sha256=b4bbfdf8fc9597d845ec4024d8a260c6cca2eac51fe166c376a6929576ad051c
sha512=73ba44c028ac70a61bb19bc08d421bc7cd8158faaabc0101b3f4ce83d4faf691f4b6212f73cadabc859984b7509a47df6a7ed27ae2578ad2efd12d2e5f7e331e

Description

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.

Published: 27 Aug 2020

README

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. See the manpage for details.

For information on contributing to Alcotest, see CONTRIBUTING.md.

Examples

A simple example (taken from examples/simple.ml):

Generated by the following test suite specification:

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

(* A module with functions to test *)
module To_test = struct
  let lowercase = String.lowercase_ascii
  let capitalize = String.capitalize_ascii
  let str_concat = String.concat ""
  let list_concat = List.append
end

(* The tests *)
let test_lowercase () =
  Alcotest.(check string) "same string" "hello!" (To_test.lowercase "hELLO!")

let test_capitalize () =
  Alcotest.(check string) "same string" "World." (To_test.capitalize "world.")

let test_str_concat () =
  Alcotest.(check string) "same string" "foobar" (To_test.str_concat ["foo"; "bar"])

let test_list_concat () =
  Alcotest.(check (list int)) "same lists" [1; 2; 3] (To_test.list_concat [1] [2; 3])

(* Run it *)
let () =
  let open Alcotest in
  run "Utils" [
      "string-case", [
          test_case "Lower case"     `Quick test_lowercase;
          test_case "Capitalization" `Quick test_capitalize;
        ];
      "string-concat", [ test_case "String mashing" `Quick test_str_concat  ];
      "list-concat",   [ test_case "List mashing"   `Slow  test_list_concat ];
    ]

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

Here's an example of a of failing test suite:

By default, only the first failing test log is printed to the console (and all test logs are captured on disk). Pass --show-errors to print all error messages.

Selecting tests to execute

You can filter which tests to run by supplying a regular expression matching the names of the tests to execute, or by passing a regular expression and a comma-separated list of test numbers (or ranges of test numbers, e.g. 2,4..9):

$ ./simple.native test '.*concat*'
Testing Utils.
[SKIP]     string-case            0   Lower case.
[SKIP]     string-case            1   Capitalization.
[OK]       string-concat          0   String mashing.
[OK]       list-concat            0   List mashing.
The full test results are available in `_build/_tests`.
Test Successful in 0.000s. 2 tests run.

$ ./simple.native test 'string-case' '1..3'
Testing Utils.
[SKIP]     string-case            0   Lower case.
[OK]       string-case            1   Capitalization.
[SKIP]     string-concat          0   String mashing.
[SKIP]     list-concat            0   List mashing.
The full test results are available in `_build/_tests`.
Test Successful in 0.000s. 1 test run.

Note that you cannot filter by test case name (i.e. Lower case or Capitalization), you must filter by test name & number instead.

See the examples folder for more examples.

Quick and Slow tests

In general you should use `Quick tests: tests that are ran on any invocations of the test suite. You should only use `Slow tests for stress tests that are ran only on occasion (typically before a release or after a major change). These slow tests can be suppressed by passing the -q flag on the command line, e.g.:

$ ./test.exe -q # run only the quick tests
$ ./test.exe    # run quick and slow tests

Passing custom options to the tests

In most cases, the base tests are unit -> unit functions. However, it is also possible to pass an extra option to all the test functions by using 'a -> unit, where 'a is the type of the extra parameter.

In order to do this, you need to specify how this extra parameter is read on the command-line, by providing a Cmdliner term for command-line arguments which explains how to parse and serialize values of type 'a (note: do not use positional arguments, only optional arguments are supported).

For instance:

let test_nice i = Alcotest.(check int) "Is it a nice integer?" i 42

let int =
  let doc = "What is your prefered number?" in
  Cmdliner.Arg.(required & opt (some int) None & info ["n"] ~doc ~docv:"NUM")

let () =
  Alcotest.run_with_args "foo" int [
    "all", ["nice", `Quick, test_nice]
  ]

Will generate test.exe such that:

$ test.exe test
test.exe: required option -n is missing

$ test.exe test -n 42
Testing foo.
[OK]                all          0   int.

Lwt

Alcotest provides an Alcotest_lwt module that you could use to wrap Lwt test cases. The basic idea is that instead of providing a test function in the form unit -> unit, you provide one with the type unit -> unit Lwt.t and alcotest-lwt calls Lwt_main.run for you.

However, there are a couple of extra features:

  • If an async exception occurs, it will cancel your test case for you and fail it (rather than exiting the process).

  • You get given a switch, which will be turned off when the test case finishes (or fails). You can use that to free up any resources.

For instance:

let free () = print_endline "freeing all resources"; Lwt.return ()

let test_lwt switch () =
  Lwt_switch.add_hook (Some switch) free;
  Lwt.async (fun () -> failwith "All is broken");
  Lwt_unix.sleep 10.

let () =
  Lwt_main.run @@ Alcotest_lwt.run "foo" [
    "all", [
      Alcotest_lwt.test_case "one" `Quick test_lwt
    ]
  ]

Will generate:

$ test.exe
Testing foo.
[ERROR]             all          0   one.
-- all.000 [one.] Failed --
in _build/_tests/all.000.output:
freeing all resources
[failure] All is broken

Comparison with other testing frameworks

The README is pretty clear about that:

Alcotest is the only testing framework using colors!

More seriously, Alcotest is similar to ounit but it fixes a few of the problems found in that library:

  • Alcotest has a nicer output, it is easier to see what failed and what succeeded and to read the log outputs of the failed tests;

  • Alcotest uses combinators to define pretty-printers and comparators between the things to test.

Other nice tools doing different kind of testing also exist:

  • qcheck qcheck does random generation and property testing (e.g. Quick Check)

  • crowbar and bun are similar to qcheck, but use compiler-directed randomness, e.g. it takes advantage of the AFL support the OCaml compiler.

  • ppx_inline_tests allows to write tests in the same file as your source-code; they will be run only in a special mode of compilation.

Dependencies (9)

  1. uutf >= "1.0.0"
  2. stdlib-shims
  3. re >= "1.7.2"
  4. uuidm
  5. cmdliner >= "1.0.3" & < "1.1.0"
  6. astring
  7. fmt >= "0.8.7"
  8. ocaml >= "4.03.0"
  9. dune >= "2.0"

Dev Dependencies

None

  1. ahrocksdb
  2. albatross >= "1.5.0"
  3. alcotest-async < "1.0.0" | = "1.2.2"
  4. alcotest-lwt < "1.0.0" | = "1.2.2"
  5. alcotest-mirage = "1.2.2"
  6. alg_structs_qcheck
  7. ambient-context
  8. ambient-context-eio
  9. ambient-context-lwt
  10. angstrom >= "0.7.0"
  11. ansi >= "0.6.0"
  12. anycache >= "0.7.4"
  13. anycache-async
  14. anycache-lwt
  15. archetype >= "1.4.2"
  16. archi
  17. arp
  18. arp-mirage
  19. arrakis
  20. art
  21. asak >= "0.2"
  22. asli >= "0.2.0"
  23. asn1-combinators >= "0.2.2"
  24. atd >= "2.3.3"
  25. atdgen >= "2.10.0"
  26. atdpy
  27. atdts
  28. base32
  29. base64 >= "2.1.2" & < "3.2.0" | >= "3.4.0"
  30. bastet
  31. bastet_async
  32. bastet_lwt
  33. bech32
  34. bechamel >= "0.5.0"
  35. bigarray-overlap
  36. bigstringaf
  37. bitlib
  38. blake2
  39. bloomf
  40. bls12-381 < "0.4.1" | >= "3.0.0" & < "18.0"
  41. bls12-381-hash
  42. bls12-381-js >= "0.4.2"
  43. bls12-381-js-gen >= "0.4.2"
  44. bls12-381-legacy
  45. bls12-381-signature
  46. bls12-381-unix
  47. blurhash
  48. builder-web
  49. bulletml
  50. bytebuffer
  51. ca-certs
  52. ca-certs-nss
  53. cactus
  54. caldav
  55. calendar >= "3.0.0"
  56. callipyge
  57. camlix
  58. camlkit
  59. camlkit-base
  60. capnp-rpc < "1.2.3"
  61. capnp-rpc-lwt < "0.3"
  62. capnp-rpc-mirage >= "0.9.0"
  63. capnp-rpc-unix >= "0.9.0" & < "1.2.3"
  64. carray
  65. carton
  66. cborl
  67. ccss >= "1.6"
  68. cf-lwt
  69. chacha
  70. channel
  71. charrua-client
  72. charrua-client-lwt
  73. charrua-client-mirage < "0.11.0"
  74. checkseum >= "0.0.3"
  75. cid
  76. clarity-lang
  77. class_group_vdf
  78. cohttp >= "0.17.0"
  79. cohttp-curl-async
  80. cohttp-curl-lwt
  81. cohttp-eio >= "6.0.0~beta2"
  82. colombe >= "0.2.0"
  83. color
  84. conan
  85. conan-cli
  86. conan-database
  87. conan-lwt
  88. conan-unix
  89. conduit = "3.0.0"
  90. conex < "0.10.0"
  91. conex-mirage-crypto
  92. conex-nocrypto
  93. cookie
  94. cow >= "2.2.0"
  95. css
  96. css-parser
  97. cstruct >= "3.3.0"
  98. cstruct-sexp
  99. ctypes-zarith
  100. cuid
  101. curly
  102. current >= "0.4"
  103. current_git >= "0.6.4"
  104. current_incr
  105. cwe_checker
  106. data-encoding
  107. datakit >= "0.12.0"
  108. datakit-bridge-github >= "0.12.0"
  109. datakit-ci
  110. datakit-client-git >= "0.12.0"
  111. decompress >= "0.8" & < "1.5.3"
  112. depyt
  113. digestif >= "0.8.1"
  114. dispatch >= "0.4.1"
  115. dkim
  116. dkim-bin
  117. dkim-mirage
  118. dns >= "4.0.0"
  119. dns-cli
  120. dns-client >= "4.6.0"
  121. dns-forward < "0.9.0"
  122. dns-forward-lwt-unix
  123. dns-resolver
  124. dns-server
  125. dns-tsig
  126. dnssd
  127. dnssec
  128. docfd >= "2.2.0"
  129. dog < "0.2.1"
  130. domain-name
  131. dot-merlin-reader >= "5.3~5.3preview"
  132. dream
  133. dream-pure
  134. duff
  135. dune-release >= "1.0.0"
  136. duration >= "0.1.1"
  137. emile
  138. encore
  139. eqaf >= "0.5"
  140. equinoxe
  141. equinoxe-cohttp
  142. equinoxe-hlc
  143. eris
  144. eris-lwt
  145. ezgzip
  146. ezjsonm >= "0.4.2" & < "1.3.0"
  147. ezjsonm-lwt
  148. FPauth
  149. FPauth-core
  150. FPauth-responses
  151. FPauth-strategies
  152. faraday != "0.2.0"
  153. farfadet
  154. fat-filesystem >= "0.12.0"
  155. ff
  156. ff-pbt
  157. fiat-p256
  158. flex-array
  159. fsevents-lwt
  160. functoria >= "2.2.0"
  161. functoria-runtime >= "2.2.0" & != "3.0.1" & < "4.0.0~beta1"
  162. geojson
  163. geoml >= "0.1.1"
  164. git = "1.4.10" | = "1.5.0" | >= "1.5.2" & != "1.10.0"
  165. git-mirage < "3.0.0"
  166. git-split
  167. git-unix >= "1.10.0" & != "2.1.0"
  168. git_split
  169. gitlab-unix
  170. glicko2
  171. gmap >= "0.3.0"
  172. gobba
  173. gpt
  174. graphql
  175. graphql-async
  176. graphql-cohttp >= "0.13.0"
  177. graphql-lwt
  178. graphql_parser != "0.11.0"
  179. graphql_ppx >= "0.7.1"
  180. h1
  181. h1_parser
  182. h2
  183. hacl
  184. hacl-star >= "0.6.0" & < "0.7.2"
  185. hacl_func
  186. hacl_x25519 >= "0.2.0"
  187. highlexer
  188. hkdf
  189. hockmd
  190. html_of_jsx
  191. http
  192. http-multipart-formdata < "2.0.0"
  193. httpaf >= "0.2.0"
  194. httpun
  195. httpun-ws
  196. hvsock
  197. icalendar >= "0.1.4"
  198. imagelib >= "20200929"
  199. index
  200. inferno >= "20220603"
  201. influxdb-async
  202. influxdb-lwt
  203. inquire < "0.2.0"
  204. interval-map
  205. iomux
  206. irmin < "0.8.0" | >= "0.9.6" & != "0.11.1" & < "1.0.0" | >= "2.0.0" & != "2.3.0"
  207. irmin-bench >= "2.7.0"
  208. irmin-chunk < "1.3.0" | >= "2.3.0"
  209. irmin-cli
  210. irmin-containers
  211. irmin-fs < "1.3.0" | >= "2.3.0"
  212. irmin-git < "2.0.0" | >= "2.3.0"
  213. irmin-http < "2.0.0"
  214. irmin-mem < "1.3.0"
  215. irmin-pack >= "2.4.0" & != "2.6.1"
  216. irmin-pack-tools
  217. irmin-test >= "2.2.0" & < "3.0.0"
  218. irmin-tezos
  219. irmin-tezos-utils
  220. irmin-unix >= "1.0.0" & < "1.3.3" | >= "2.4.0" & != "2.6.1"
  221. irmin-watcher
  222. jekyll-format
  223. jerboa
  224. jitsu
  225. jose
  226. json-data-encoding >= "0.9"
  227. json_decoder
  228. jsonxt
  229. junit_alcotest
  230. jwto
  231. kdf
  232. ke >= "0.2"
  233. kkmarkdown
  234. lambda-runtime
  235. lambda_streams
  236. lambda_streams_async
  237. lambdapi >= "2.0.0"
  238. lambdoc >= "1.0-beta4"
  239. ledgerwallet-tezos >= "0.2.1" & < "0.4.0"
  240. letters
  241. lmdb >= "1.0"
  242. logical
  243. logtk >= "1.6"
  244. lp
  245. lp-glpk
  246. lp-glpk-js
  247. lp-gurobi
  248. lru
  249. lt-code
  250. luv
  251. mbr-format >= "1.0.0"
  252. mdx >= "1.6.0"
  253. mec
  254. mechaml >= "1.0.0"
  255. merge-queues >= "0.2.0"
  256. merge-ropes >= "0.2.0"
  257. merlin >= "4.17.1-414" & < "5.0-502" | >= "5.2.1-502"
  258. merlin-lib >= "4.17.1-414" & < "5.0-502" | >= "5.2.1-502"
  259. metrics
  260. middleware
  261. minicaml = "0.3.1" | >= "0.4"
  262. mirage >= "4.0.0~beta1"
  263. mirage-block-partition
  264. mirage-block-ramdisk >= "0.3"
  265. mirage-channel >= "4.0.0"
  266. mirage-channel-lwt
  267. mirage-crypto-ec
  268. mirage-flow >= "1.0.2" & < "1.2.0"
  269. mirage-flow-unix
  270. mirage-fs-mem
  271. mirage-fs-unix >= "1.2.0"
  272. mirage-kv >= "2.0.0"
  273. mirage-kv-mem
  274. mirage-kv-unix
  275. mirage-logs >= "0.3.0"
  276. mirage-nat
  277. mirage-net-unix >= "2.3.0"
  278. mirage-runtime >= "4.0.0~beta1" & < "4.5.0"
  279. mirage-tc
  280. mjson
  281. mmdb
  282. mnd
  283. monocypher
  284. mrmime >= "0.2.0"
  285. mrt-format
  286. msgpck >= "1.6"
  287. mssql >= "2.0.3"
  288. multibase
  289. multihash
  290. multihash-digestif
  291. multipart-form-data
  292. multipart_form
  293. multipart_form-eio
  294. multipart_form-lwt
  295. named-pipe
  296. nanoid
  297. nbd >= "4.0.3"
  298. nbd-tool
  299. nloge
  300. nocoiner
  301. non_empty_list
  302. OCADml >= "0.6.0"
  303. obatcher
  304. ocaml-index >= "1.1"
  305. ocaml-r >= "0.4.0"
  306. ocaml-version >= "3.1.0"
  307. ocamlformat >= "0.13.0" & != "0.19.0~4.13preview" & < "0.25.1"
  308. ocamlformat-rpc < "removed"
  309. ocamline
  310. ocluster < "0.3.0"
  311. odoc >= "1.4.0" & < "2.1.0"
  312. ohex
  313. oidc
  314. opam-0install
  315. opam-0install-cudf >= "0.5.0"
  316. opam-compiler
  317. opam-file-format >= "2.1.1"
  318. opentelemetry >= "0.6"
  319. opentelemetry-client-cohttp-lwt >= "0.6"
  320. opentelemetry-client-ocurl >= "0.6"
  321. opentelemetry-cohttp-lwt >= "0.6"
  322. opentelemetry-lwt >= "0.6"
  323. opium >= "0.15.0"
  324. opium-graphql
  325. opium-testing
  326. opium_kernel
  327. orewa
  328. ortac-core
  329. osx-acl
  330. osx-attr
  331. osx-cf
  332. osx-fsevents
  333. osx-membership
  334. osx-mount
  335. osx-xattr
  336. otoggl
  337. owl >= "0.6.0" & != "0.9.0" & != "1.0.0"
  338. owl-base < "0.5.0"
  339. owl-ode >= "0.1.0" & != "0.2.0"
  340. owl-symbolic
  341. passmaker
  342. patch
  343. pbkdf
  344. pecu >= "0.2"
  345. pf-qubes
  346. pg_query >= "0.9.6"
  347. pgx >= "1.0"
  348. pgx_unix >= "1.0"
  349. pgx_value_core
  350. pgx_value_ptime < "2.2"
  351. phylogenetics
  352. piaf
  353. polyglot
  354. polynomial
  355. ppx_blob >= "0.3.0"
  356. ppx_deriving_cmdliner
  357. ppx_deriving_rpc
  358. ppx_deriving_yaml
  359. ppx_graphql >= "0.2.0"
  360. ppx_inline_alcotest
  361. ppx_parser
  362. ppx_protocol_conv >= "5.0.0"
  363. ppx_protocol_conv_json >= "5.0.0"
  364. ppx_protocol_conv_jsonm >= "5.0.0"
  365. ppx_protocol_conv_msgpack >= "5.0.0"
  366. ppx_protocol_conv_xml_light >= "5.0.0"
  367. ppx_protocol_conv_xmlm
  368. ppx_protocol_conv_yaml >= "5.0.0"
  369. ppx_repr < "0.4.0"
  370. ppx_subliner
  371. ppx_units
  372. ppx_yojson >= "1.1.0"
  373. pratter
  374. prc
  375. preface
  376. pretty_expressive
  377. prettym
  378. proc-smaps
  379. producer < "0.2.0"
  380. progress < "0.2.0"
  381. prom
  382. prometheus < "1.2"
  383. prometheus-app
  384. protocell
  385. protocol-9p >= "0.3" & < "0.11.0" | >= "0.11.2"
  386. protocol-9p-unix
  387. psq
  388. qcheck >= "0.18"
  389. qcheck-alcotest
  390. qcheck-core >= "0.18"
  391. quickjs
  392. radis
  393. randii
  394. reason-standard
  395. red-black-tree
  396. reparse >= "2.0.0" & < "3.0.0"
  397. reparse-unix < "2.1.0"
  398. resp
  399. resp-unix >= "0.10.0"
  400. rfc1951 < "1.0.0"
  401. routes < "2.0.0"
  402. rpc >= "7.1.0"
  403. rpclib >= "7.1.0"
  404. rpclib-async
  405. rpclib-lwt >= "7.1.0"
  406. rpmfile < "0.3.0"
  407. rpmfile-eio
  408. rpmfile-unix
  409. rubytt
  410. SZXX >= "4.0.0"
  411. salsa20
  412. salsa20-core
  413. sanddb >= "0.2"
  414. scaml >= "1.5.0"
  415. scrypt-kdf
  416. secp256k1 >= "0.4.1"
  417. secp256k1-internal
  418. semver >= "0.2.1"
  419. sendmail
  420. sendmail-lwt
  421. sendmail-miou-unix
  422. sendmail-mirage
  423. sendmsg
  424. server-reason-react
  425. session-cookie
  426. session-cookie-async
  427. session-cookie-lwt
  428. sherlodoc
  429. sihl < "0.2.0"
  430. sihl-type
  431. slug
  432. sodium-fmt
  433. solidity-alcotest
  434. spin >= "0.7.0"
  435. squirrel
  436. ssh-agent
  437. ssl >= "0.6.0"
  438. stramon-lib
  439. styled-ppx
  440. swapfs
  441. syslog-rfc5424
  442. tcpip >= "2.4.2" & < "4.0.0" | >= "5.0.1" & < "7.0.0"
  443. tdigest < "2.1.0"
  444. term-indexing
  445. term-tools
  446. terminal_size >= "0.1.1"
  447. terminus
  448. terminus-cohttp
  449. terminus-hlc
  450. terml
  451. testo
  452. testo-lwt
  453. textrazor
  454. tezos-base-test-helpers < "13.0"
  455. tezos-bls12-381-polynomial
  456. tezos-client-base < "12.0"
  457. tezos-crypto >= "8.0" & < "9.0"
  458. tezos-lmdb
  459. tezos-plompiler = "0.1.3"
  460. tezos-plonk = "0.1.3"
  461. tezos-signer-backends >= "8.0" & < "13.0"
  462. tezos-stdlib >= "8.0" & < "12.0"
  463. tezos-test-helpers < "12.0"
  464. tftp
  465. timedesc
  466. timere
  467. tls >= "0.12.0"
  468. toc
  469. topojson
  470. topojsone
  471. transept
  472. twostep
  473. type_eq
  474. type_id
  475. typebeat
  476. typeid >= "1.0.1"
  477. tyre >= "0.4"
  478. tyxml >= "4.0.0"
  479. tyxml-jsx
  480. tyxml-ppx >= "4.3.0"
  481. tyxml-syntax
  482. uecc
  483. ulid
  484. universal-portal
  485. unix-dirent
  486. unix-errno >= "0.3.0"
  487. unix-fcntl >= "0.3.0"
  488. unix-sys-resource
  489. unix-sys-stat
  490. unix-time
  491. unstrctrd
  492. user-agent-parser
  493. uspf
  494. uspf-lwt
  495. uspf-mirage
  496. uspf-unix
  497. utop >= "2.13.0"
  498. validate
  499. validator
  500. vercel
  501. vpnkit
  502. wcwidth
  503. websocketaf
  504. x509 >= "0.7.0"
  505. xapi-rrd >= "1.8.2"
  506. xapi-stdext-date
  507. xapi-stdext-encodings
  508. xapi-stdext-std >= "4.16.0"
  509. yaml < "3.2.0"
  510. yaml-sexp
  511. yocaml < "2.0.0"
  512. yocaml_syndication = "2.0.0"
  513. yocaml_yaml < "2.0.0"
  514. yojson >= "1.6.0"
  515. yojson-five
  516. yuscii >= "0.3.0"
  517. yuujinchou = "1.0.0"
  518. zar
  519. zed >= "3.2.2"
  520. zlist < "0.4.0"

Conflicts

None

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