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;;; test-chime-async-helpers.el --- Tests for async result helpers -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Craig Jennings
;; Author: Craig Jennings <c@cjennings.net>
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Unit tests for the async-result helpers used inside
;; chime--fetch-and-process:
;; - chime--record-async-failure
;; - chime--handle-async-success
;;; Code:
(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
;;; Setup and Teardown
(defun test-chime-async-helpers-setup ()
"Reset counters and modeline state before each test."
(setq chime--consecutive-async-failures 0)
(setq chime-max-consecutive-failures 5)
(setq chime-modeline-no-events-text "*")
(setq chime-modeline-string nil))
(defun test-chime-async-helpers-teardown ()
"Restore default state after each test."
(setq chime--consecutive-async-failures 0)
(setq chime-max-consecutive-failures 5)
(setq chime-modeline-string nil))
;;;; Tests for chime--record-async-failure
(ert-deftest test-chime-record-async-failure-normal-increments-counter ()
"Normal: each call increments the consecutive-failure counter by one."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((err '(error "boom")))
(chime--record-async-failure err "Async error")
(should (= 1 chime--consecutive-async-failures))
(chime--record-async-failure err "Async error")
(should (= 2 chime--consecutive-async-failures)))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-record-async-failure-normal-sets-modeline-error-state ()
"Normal: sets chime-modeline-string with the standard error tooltip."
(test-chime-async-helpers-setup)
(unwind-protect
(cl-letf (((symbol-function 'force-mode-line-update) (lambda (&optional _))))
(chime--record-async-failure '(error "boom") "Async error")
(should chime-modeline-string)
(should (string-match-p "Event check failed"
(get-text-property 0 'help-echo chime-modeline-string))))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-record-async-failure-normal-warns-at-threshold ()
"Normal: triggers display-warning when the counter reaches the threshold."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((warned nil))
(setq chime--consecutive-async-failures 4)
(setq chime-max-consecutive-failures 5)
(cl-letf (((symbol-function 'display-warning)
(lambda (_type _msg &rest _args) (setq warned t)))
((symbol-function 'force-mode-line-update) (lambda (&optional _))))
(chime--record-async-failure '(error "boom") "Async error")
(should warned)
(should (= 5 chime--consecutive-async-failures))))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-record-async-failure-boundary-no-modeline-text-skips-modeline ()
"Boundary: when chime-modeline-no-events-text is nil, modeline string stays nil."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((chime-modeline-no-events-text nil))
(setq chime-modeline-string nil)
(chime--record-async-failure '(error "boom") "Async error")
(should (= 1 chime--consecutive-async-failures))
(should (null chime-modeline-string)))
(test-chime-async-helpers-teardown)))
;;;; Tests for chime--handle-async-success
(ert-deftest test-chime-handle-async-success-normal-resets-counter ()
"Normal: resets the consecutive-failure counter from a positive value to zero."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((called-with nil))
(setq chime--consecutive-async-failures 3)
(chime--handle-async-success
(lambda (events) (setq called-with events))
'(event1 event2))
(should (= 0 chime--consecutive-async-failures)))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-handle-async-success-normal-invokes-callback-with-events ()
"Normal: calls the supplied callback with the events list."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((called-with 'unset))
(chime--handle-async-success
(lambda (events) (setq called-with events))
'(a b c))
(should (equal '(a b c) called-with)))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-handle-async-success-boundary-empty-events ()
"Boundary: works with an empty events list."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((called-with 'unset))
(chime--handle-async-success
(lambda (events) (setq called-with events))
'())
(should (null called-with))
(should (= 0 chime--consecutive-async-failures)))
(test-chime-async-helpers-teardown)))
(ert-deftest test-chime-handle-async-success-boundary-counter-already-zero ()
"Boundary: counter starts at zero, stays at zero, callback still fires."
(test-chime-async-helpers-setup)
(unwind-protect
(let ((called-with 'unset))
(setq chime--consecutive-async-failures 0)
(chime--handle-async-success
(lambda (events) (setq called-with events))
'(x))
(should (= 0 chime--consecutive-async-failures))
(should (equal '(x) called-with)))
(test-chime-async-helpers-teardown)))
(provide 'test-chime-async-helpers)
;;; test-chime-async-helpers.el ends here
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