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;;; coroutine-tests.el --- coroutine tests -*- lexical-binding: t; -*-
;; Copyright (C) 2016 Free Software Foundation, Inc.
;; Author: Philipp Stephani <p.stephani2@gmail.com>
;; 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 src/coroutine.c.
;;; Code:
(defun coroutine-tests--prime-task (channel)
(let ((prime (receive-from-channel channel)))
(message "%d" prime)
(let ((new-channel (make-channel)))
(start-coroutine (lambda () (coroutine-tests--prime-task new-channel)))
(while t
(let ((i (receive-from-channel channel)))
(unless (zerop (mod i prime))
(send-to-channel new-channel i)))))))
(ert-deftest coroutines-tests--prime ()
(let ((channel (make-channel)))
(start-coroutine (lambda () (coroutine-tests--prime-task channel)))
(cl-loop for i from 2 to 100
do (send-to-channel channel i))))
(ert-deftest coroutines-test--go-tour-1 ()
(cl-flet ((say (s)
(dotimes (_ 5)
(sleep-for 0.1)
(message "%s" s))))
(start-coroutine (lambda () (say "world")))
(say "hello")))
(ert-deftest coroutines-test--go-tour-2 ()
(cl-flet ((sum (s c)
(let ((sum 0))
(dolist (v s) (cl-incf sum v))
(send-to-channel c sum))))
(let ((s '(7 2 8 -9 4 0))
(c (make-channel)))
(start-coroutine (lambda () (sum (butlast s (/ (length s) 2)) c)))
(start-coroutine (lambda () (sum (nthcdr (/ (length s) 2) s) c)))
(let ((x (receive-from-channel c))
(y (receive-from-channel c)))
(message "%d" (+ x y))
(should (equal (+ x y) (apply #'+ s)))))))
(ert-deftest coroutines-test--go-tour-3 ()
(let ((ch (make-channel 2)))
(send-to-channel ch 1)
(send-to-channel ch 2)
(should (equal (receive-from-channel ch) 1))
(should (equal (receive-from-channel ch) 2))))
(ert-deftest coroutines-test--go-tour-4 ()
(cl-flet ((fibonacci (n c close)
(let ((x 0) (y 1))
(dotimes (_ n)
(send-to-channel c x)
(cl-psetq x y
y (+ x y))))
(send-to-channel close nil)))
(let ((c (make-channel 10))
(close (make-channel 1)))
(start-coroutine (lambda () (fibonacci 10 c close)))
(cl-block nil
(while t
(select
((receive c i)
(message "%d" i))
((receive close)
(cl-return))))))))
(ert-deftest coroutines-test--go-tour-5 ()
(cl-flet ((fibonacci (c quit)
(cl-block nil
(let ((x 0) (y 1))
(while t
(select
((send c x)
(cl-psetq x y
y (+ x y)))
((receive quit)
(message "quit")
(cl-return))))))))
(let ((c (make-channel))
(quit (make-channel)))
(start-coroutine
(lambda ()
(dotimes (_ 10)
(message "%S" (receive-from-channel c)))
(send-to-channel quit nil)))
(fibonacci c quit))))
(defun coroutines-test--time-tick (d)
(cl-check-type d (and number cl-plus))
(let ((c (make-channel 1)))
(run-at-time nil d (lambda ()
(try-send-to-channel c (current-time))))
c))
(defun coroutines-test--time-after (d)
(cl-check-type d (and number cl-plus))
(let ((c (make-channel 1)))
(run-at-time d nil (lambda ()
(try-send-to-channel c (current-time))))
c))
(ert-deftest coroutines-test--go-tour-6 ()
(cl-block nil
(let ((tick (coroutines-test--time-tick 0.1))
(boom (coroutines-test--time-after 0.5)))
(while t
(select
((receive tick)
(message "tick."))
((receive boom)
(message "BOOM!")
(cl-return))
(default
(message " .")
(sleep-for 0.05)))))))
(defvar coroutines-test--var nil)
(ert-deftest coroutines-test--specbind ()
(let ((coroutines-test--var 'main)
(channel (make-channel)))
(start-coroutine
(lambda ()
(let ((coroutines-test--var 'child))
(setq coroutines-test--var 'child-setq)
(receive-from-channel channel)
(should (equal coroutines-test--var 'child-setq)))))
(should (equal coroutines-test--var 'main))
(setq coroutines-test--var 'main-setq)
(send-to-channel channel nil)
(should (equal coroutines-test--var 'main-setq))))
;; (ert-deftest coroutines-test--deadlock ()
;; (let ((ch-1 (make-channel))
;; (ch-2 (make-channel)))
;; (start-coroutine
;; (lambda ()
;; (receive-from-channel ch-1)
;; (send-to-channel ch-2 nil)))
;; (receive-from-channel ch-2)
;; (send-to-channel ch-1 nil)))
(ert-deftest coroutines-test--signal ()
(start-coroutine (lambda () (signal 'beginning-of-buffer '(foo))))
(let ((err (should-error (sleep-for 0.1))))
(should (equal err '(beginning-of-buffer foo)))))
(ert-deftest channelp ()
(should-not (channelp nil))
(should-not (channelp 5))
(should (channelp (make-channel))))
;;; coroutine-tests.el ends here
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