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;;; ring-tests.el --- Tests for ring.el -*- lexical-binding: t; -*-
;; Copyright (C) 2016-2025 Free Software Foundation, Inc.
;; Author: Simen Heggestøyl <simenheg@gmail.com>
;; Keywords:
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'ert)
(require 'ring)
(ert-deftest ring-tests-make-ring-ring-p ()
(should (ring-p (make-ring 5))))
(ert-deftest ring-tests-insert-at-beginning ()
(let ((ring (make-ring 5)))
(ring-insert-at-beginning ring 'foo)
(ring-insert-at-beginning ring 'bar)
(should (equal (ring-elements ring) '(foo bar)))))
(ert-deftest ring-tests-plus1 ()
(should (= (ring-plus1 0 5) 1))
(should (= (ring-plus1 4 5) 0)))
(ert-deftest ring-tests-minus1 ()
(should (= (ring-minus1 0 5) 4))
(should (= (ring-minus1 4 5) 3)))
(ert-deftest ring-tests-length ()
(let ((ring (make-ring 2)))
(should (= (ring-length ring) 0))
(ring-insert ring 'a)
(should (= (ring-length ring) 1))
(ring-insert ring 'b)
(should (= (ring-length ring) 2))
(ring-insert ring 'c)
(should (= (ring-length ring) 2))))
(ert-deftest ring-tests-index ()
(should (= (ring-index 0 0 3 3) 2))
(should (= (ring-index 0 0 3 5) 2))
(should (= (ring-index 0 2 3 3) 1))
(should (= (ring-index 1 2 3 3) 0))
(should (= (ring-index 2 2 3 3) 2)))
(ert-deftest ring-tests-empty-p ()
(let ((ring (make-ring 5)))
(should (ring-empty-p ring))
(ring-insert ring 1)
(should-not (ring-empty-p ring))
(ring-remove ring)
(should (ring-empty-p ring))))
(ert-deftest ring-tests-size ()
(let ((ring (make-ring 2)))
(should (= (ring-size ring) 2))
(ring-insert ring "a")
(ring-insert ring "b")
(ring-insert ring "c")
(should (= (ring-size ring) 2))
(ring-extend ring 3)
(should (= (ring-size ring) 5))))
(ert-deftest ring-tests-copy ()
(let ((ring1 (make-ring 3)))
(ring-insert ring1 1)
(ring-insert ring1 2)
(let ((ring2 (ring-copy ring1)))
(should-not (eq ring1 ring2))
(should (= (ring-size ring1) (ring-size ring2)))
(should (equal (ring-elements ring1) (ring-elements ring2))))))
(ert-deftest ring-tests-insert ()
(let ((ring (make-ring 2)))
(ring-insert ring :a)
(should (equal (ring-elements ring) '(:a)))
(ring-insert ring :b)
(should (equal (ring-elements ring) '(:b :a)))
(ring-insert ring :c)
(should (equal (ring-elements ring) '(:c :b)))))
(ert-deftest ring-tests-remove ()
(let ((ring (make-ring 2)))
(should-error (ring-remove ring))
(ring-insert ring 'foo)
(ring-insert ring 'bar)
(should (eq (ring-remove ring) 'foo))
(should (equal (ring-elements ring) '(bar)))
(ring-insert ring 'baz)
(should (eq (ring-remove ring 0) 'baz))
(should (equal (ring-elements ring) '(bar)))))
(ert-deftest ring-tests-ref ()
(let ((ring (make-ring 2)))
(should-error (ring-ref ring 0))
(ring-insert ring :a)
(should (eq (ring-ref ring 0) :a))
(ring-insert ring :b)
(should (eq (ring-ref ring 0) :b))
(should (eq (ring-ref ring 1) :a))
(should (eq (ring-ref ring 2) :b))))
(ert-deftest ring-tests-elements ()
(let ((ring (make-ring 5)))
(ring-insert ring 3)
(ring-insert ring 2)
(ring-insert ring 1)
(should (equal (ring-elements ring) '(1 2 3)))))
(ert-deftest ring-tests-member ()
(let ((ring (make-ring 3)))
(ring-insert ring "foo")
(ring-insert ring "bar")
(should (= (ring-member ring "foo") 1))
(should (= (ring-member ring "bar") 0))
(should-not (ring-member ring "baz"))))
(ert-deftest ring-tests-next ()
(let ((ring (make-ring 3)))
(ring-insert ring 'a)
(ring-insert ring 'b)
(should (eq (ring-next ring 'b) 'a))
(should (eq (ring-next ring 'a) 'b))
(should-error (ring-next ring 'c))))
(ert-deftest ring-tests-previous ()
(let ((ring (make-ring 3)))
(ring-insert ring 'a)
(ring-insert ring 'b)
(should (eq (ring-previous ring 'b) 'a))
(should (eq (ring-previous ring 'a) 'b))
(should-error (ring-previous ring 'c))))
(ert-deftest ring-tests-extend ()
(let ((ring (make-ring 2)))
(ring-insert ring 1)
(ring-insert ring 2)
(should (= (ring-size ring) 2))
(should (= (ring-length ring) 2))
(ring-extend ring 3)
(ring-insert ring 3)
(should (= (ring-size ring) 5))
(should (equal (ring-elements ring) '(3 2 1)))))
(ert-deftest ring-resize/grow ()
(let ((ring (make-ring 3)))
(ring-insert ring 1)
(ring-insert ring 2)
(ring-insert ring 3)
(ring-resize ring 5)
(should (= (ring-size ring) 5))
(should (equal (ring-elements ring) '(3 2 1)))))
(ert-deftest ring-resize/grow-empty ()
(let ((ring (make-ring 3)))
(ring-resize ring 5)
(should (= (ring-size ring) 5))
(should (equal (ring-elements ring) '()))))
(ert-deftest ring-resize/grow-wrapped-ring ()
(let ((ring (make-ring 3)))
(ring-insert ring 1)
(ring-insert ring 2)
(ring-insert ring 3)
(ring-insert ring 4)
(ring-insert ring 5)
(ring-resize ring 5)
(should (= (ring-size ring) 5))
(should (equal (ring-elements ring) '(5 4 3)))))
(ert-deftest ring-resize/shrink ()
(let ((ring (make-ring 5)))
(ring-insert ring 1)
(ring-insert ring 2)
(ring-insert ring 3)
(ring-insert ring 4)
(ring-insert ring 5)
(ring-resize ring 3)
(should (= (ring-size ring) 3))
(should (equal (ring-elements ring) '(5 4 3)))))
(ert-deftest ring-tests-insert-2 ()
(let ((ring (make-ring 2)))
(ring-insert+extend ring :a)
(ring-insert+extend ring :b)
(should (equal (ring-elements ring) '(:b :a)))
(ring-insert+extend ring :c)
(should (equal (ring-elements ring) '(:c :b)))
(ring-insert+extend ring :d t)
(should (equal (ring-elements ring) '(:d :c :b)))))
(ert-deftest ring-tests-remove+insert+extend ()
(let ((ring (make-ring 3)))
(ring-insert ring 1)
(ring-insert ring 1)
(ring-insert ring 2)
(ring-remove+insert+extend ring 1)
(should (equal (ring-elements ring) '(1 2)))
(ring-remove+insert+extend ring 0)
(should (equal (ring-elements ring) '(0 1 2)))
(ring-remove+insert+extend ring 3)
(should (equal (ring-elements ring) '(3 0 1)))
(ring-remove+insert+extend ring 4 t)
(should (equal (ring-elements ring) '(4 3 0 1)))
(ring-remove+insert+extend ring 1 t)
(should (equal (ring-elements ring) '(1 4 3 0)))))
(ert-deftest ring-tests-convert-sequence-to-ring ()
(let ((ring (ring-convert-sequence-to-ring '(a b c))))
(should (equal (ring-elements ring) '(a b c))))
(let ((ring (ring-convert-sequence-to-ring [1 2 3])))
(should (equal (ring-elements ring) '(1 2 3))))
(let ((ring (ring-convert-sequence-to-ring "abc")))
(should (equal (ring-elements ring) '(?a ?b ?c))))
(let ((ring (make-ring 2)))
(ring-insert ring :a)
(ring-insert ring :b)
(should
(equal (ring-elements (ring-convert-sequence-to-ring ring))
(ring-elements ring)))))
(provide 'ring-tests)
;;; ring-tests.el ends here
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