tests: add oauth tests

Author: yasunariw

test/dune

@@ -1,5 +1,5 @@
 (executables
- (names test github_link_test)
+ (names test github_link_test slack_oauth_test)
  (libraries lib base base.caml devkit devkit.core extlib lwt.unix stdio
    yojson)
  (preprocess
@@ -26,3 +26,8 @@
  (alias runtest)
  (action
    (run ./github_link_test.exe)))
+
+(rule
+ (alias runtest)
+ (action
+   (run ./slack_oauth_test.exe)))

test/slack_oauth_test.ml

@@ -0,0 +1,56 @@
+open Base
+open Printf
+open Lib
+module Action = Action.Action (Api_local.Github) (Api_local.Slack)
+
+let log = Devkit.Log.from "oauth_test"
+
+let arg_code = "code", "1591663521684.1613458437648.4a18cf683e541ff9d8fd75075181cac49c7acae9431d7e4ffd424ce1ca8d2543"
+
+let arg_state = "state", "foo"
+
+let arg_state_bad = "state", "bar"
+
+let secrets_default () : Config_t.secrets =
+  {
+    gh_token = None;
+    gh_hook_token = None;
+    slack_hooks = [];
+    slack_access_token = None;
+    slack_client_id = Some "";
+    slack_client_secret = Some "";
+    slack_signing_secret = None;
+    slack_oauth_state = None;
+  }
+
+let secrets_with_state = { (secrets_default ()) with slack_oauth_state = Some "foo" }
+
+let secrets_with_token = { (secrets_default ()) with slack_access_token = Some "original token" }
+
+let tests =
+  [
+    "success, valid params", [ arg_code ], secrets_default (), Some (sprintf "token of code %s" (snd arg_code));
+    "success, with state", [ arg_code; arg_state ], secrets_with_state, Some (sprintf "token of code %s" (snd arg_code));
+    "no-op, token exists", [ arg_code ], secrets_with_token, Some "original token";
+    "failure, no state arg", [ arg_code ], secrets_with_state, None;
+    "failure, bad state arg", [ arg_code; arg_state_bad ], secrets_with_state, None;
+    "failure, no code arg", [], secrets_default (), None;
+  ]
+
+let process (name, args, secrets, expected_token) =
+  let ctx = Context.make () in
+  ctx.secrets <- Some secrets;
+  Option.iter secrets.slack_access_token ~f:(fun t -> ctx.state.slack_access_token <- Some t);
+  let%lwt _msg = Action.process_slack_oauth ctx args in
+  match assert ((Option.equal String.equal) ctx.state.slack_access_token expected_token) with
+  | exception Assert_failure _ -> Lwt.return @@ Error (sprintf "test failed: %s" name)
+  | () -> Lwt.return @@ Ok ()
+
+let () =
+  Lwt_main.run
+    ( match%lwt Lwt_list.map_s process tests |> Lwt.map Result.combine_errors_unit with
+    | Ok () -> Lwt.return_unit
+    | Error e ->
+      List.iter e ~f:Stdio.print_endline;
+      Caml.exit 1
+    )