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+;;; seq-tests.el --- Tests for sequences.el
+
+;; Copyright (C) 2014-2015 Free Software Foundation, Inc.
+
+;; Author: Nicolas Petton <nicolas@petton.fr>
+;; Maintainer: emacs-devel@gnu.org
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Tests for sequences.el
+
+;;; Code:
+
+(require 'ert)
+(require 'seq)
+
+(defmacro with-test-sequences (spec &rest body)
+  "Successively bind VAR to a list, vector, and string built from SEQ.
+Evaluate BODY for each created sequence.
+
+\(fn (var seq) body)"
+  (declare (indent 1) (debug ((symbolp form) body)))
+  (let ((initial-seq (make-symbol "initial-seq")))
+    `(let ((,initial-seq ,(cadr spec)))
+       ,@(mapcar (lambda (s)
+                   `(let ((,(car spec) (apply (function ,s) ,initial-seq)))
+                      ,@body))
+                 '(list vector string)))))
+
+(defun same-contents-p (seq1 seq2)
+  "Return t if SEQ1 and SEQ2 have the same contents, nil otherwise."
+  (equal (append seq1 '()) (append seq2 '())))
+
+(defun test-sequences-evenp (integer)
+  "Return t if INTEGER is even."
+  (eq (logand integer 1) 0))
+
+(defun test-sequences-oddp (integer)
+  "Return t if INTEGER is odd."
+  (not (test-sequences-evenp integer)))
+
+(ert-deftest test-setf-seq-elt ()
+  (with-test-sequences (seq '(1 2 3))
+    (setf (seq-elt seq 1) 4)
+    (should (= 4 (seq-elt seq 1)))))
+
+(ert-deftest test-seq-drop ()
+  (with-test-sequences (seq '(1 2 3 4))
+    (should (equal (seq-drop seq 0) seq))
+    (should (equal (seq-drop seq 1) (seq-subseq seq 1)))
+    (should (equal (seq-drop seq 2) (seq-subseq seq 2)))
+    (should (seq-empty-p (seq-drop seq 4)))
+    (should (seq-empty-p (seq-drop seq 10))))
+  (with-test-sequences (seq '())
+    (should (seq-empty-p (seq-drop seq 0)))
+    (should (seq-empty-p (seq-drop seq 1)))))
+
+(ert-deftest test-seq-take ()
+  (with-test-sequences (seq '(2 3 4 5))
+    (should (seq-empty-p (seq-take seq 0)))
+    (should (= (seq-length (seq-take seq 1)) 1))
+    (should (= (seq-elt (seq-take seq 1) 0) 2))
+    (should (same-contents-p (seq-take seq 3) '(2 3 4)))
+    (should (equal (seq-take seq 10) seq))))
+
+(ert-deftest test-seq-drop-while ()
+  (with-test-sequences (seq '(1 3 2 4))
+    (should (equal (seq-drop-while #'test-sequences-oddp seq)
+                   (seq-drop seq 2)))
+    (should (equal (seq-drop-while #'test-sequences-evenp seq)
+                   seq))
+    (should (seq-empty-p (seq-drop-while #'numberp seq))))
+  (with-test-sequences (seq '())
+    (should (seq-empty-p (seq-drop-while #'test-sequences-oddp seq)))))
+
+(ert-deftest test-seq-take-while ()
+  (with-test-sequences (seq '(1 3 2 4))
+    (should (equal (seq-take-while #'test-sequences-oddp seq)
+                   (seq-take seq 2)))
+    (should (seq-empty-p (seq-take-while #'test-sequences-evenp seq)))
+    (should (equal (seq-take-while #'numberp seq) seq)))
+  (with-test-sequences (seq '())
+    (should (seq-empty-p (seq-take-while #'test-sequences-oddp seq)))))
+
+(ert-deftest test-seq-filter ()
+  (with-test-sequences (seq '(6 7 8 9 10))
+    (should (equal (seq-filter #'test-sequences-evenp seq) '(6 8 10)))
+    (should (equal (seq-filter #'test-sequences-oddp seq) '(7 9)))
+    (should (equal (seq-filter (lambda (elt) nil) seq) '())))
+  (with-test-sequences (seq '())
+    (should (equal (seq-filter #'test-sequences-evenp seq) '()))))
+
+(ert-deftest test-seq-remove ()
+  (with-test-sequences (seq '(6 7 8 9 10))
+    (should (equal (seq-remove #'test-sequences-evenp seq) '(7 9)))
+    (should (equal (seq-remove #'test-sequences-oddp seq) '(6 8 10)))
+    (should (same-contents-p (seq-remove (lambda (elt) nil) seq) seq)))
+  (with-test-sequences (seq '())
+    (should (equal (seq-remove #'test-sequences-evenp seq) '()))))
+
+(ert-deftest test-seq-count ()
+  (with-test-sequences (seq '(6 7 8 9 10))
+    (should (equal (seq-count #'test-sequences-evenp seq) 3))
+    (should (equal (seq-count #'test-sequences-oddp seq) 2))
+    (should (equal (seq-count (lambda (elt) nil) seq) 0)))
+  (with-test-sequences (seq '())
+    (should (equal (seq-count #'test-sequences-evenp seq) 0))))
+
+(ert-deftest test-seq-reduce ()
+  (with-test-sequences (seq '(1 2 3 4))
+    (should (= (seq-reduce #'+ seq 0) 10))
+    (should (= (seq-reduce #'+ seq 5) 15)))
+  (with-test-sequences (seq '())
+    (should (eq (seq-reduce #'+ seq 0) 0))
+    (should (eq (seq-reduce #'+ seq 7) 7))))
+
+(ert-deftest test-seq-some ()
+  (with-test-sequences (seq '(4 3 2 1))
+    (should (seq-some #'test-sequences-evenp seq))
+    (should (seq-some #'test-sequences-oddp seq))
+    (should-not (seq-some (lambda (elt) (> elt 10)) seq)))
+  (with-test-sequences (seq '())
+    (should-not (seq-some #'test-sequences-oddp seq)))
+  (should (seq-some #'null '(1 nil 2))))
+
+(ert-deftest test-seq-find ()
+  (with-test-sequences (seq '(4 3 2 1))
+    (should (= 4 (seq-find #'test-sequences-evenp seq)))
+    (should (= 3 (seq-find #'test-sequences-oddp seq)))
+    (should-not (seq-find (lambda (elt) (> elt 10)) seq)))
+  (should-not (seq-find #'null '(1 nil 2)))
+  (should-not (seq-find #'null '(1 nil 2) t))
+  (should-not (seq-find #'null '(1 2 3)))
+  (should (seq-find #'null '(1 2 3) 'sentinel)))
+
+(ert-deftest test-seq-contains ()
+  (with-test-sequences (seq '(3 4 5 6))
+    (should (seq-contains seq 3))
+    (should-not (seq-contains seq 7)))
+  (with-test-sequences (seq '())
+    (should-not (seq-contains seq 3))
+    (should-not (seq-contains seq nil))))
+
+(ert-deftest test-seq-every-p ()
+  (with-test-sequences (seq '(43 54 22 1))
+    (should (seq-every-p (lambda (elt) t) seq))
+    (should-not (seq-every-p #'test-sequences-oddp seq))
+    (should-not (seq-every-p #'test-sequences-evenp seq)))
+  (with-test-sequences (seq '(42 54 22 2))
+    (should (seq-every-p #'test-sequences-evenp seq))
+    (should-not (seq-every-p #'test-sequences-oddp seq)))
+  (with-test-sequences (seq '())
+    (should (seq-every-p #'identity seq))
+    (should (seq-every-p #'test-sequences-evenp seq))))
+
+(ert-deftest test-seq-empty-p ()
+  (with-test-sequences (seq '(0))
+    (should-not (seq-empty-p seq)))
+  (with-test-sequences (seq '(0 1 2))
+    (should-not (seq-empty-p seq)))
+  (with-test-sequences (seq '())
+    (should (seq-empty-p seq))))
+
+(ert-deftest test-seq-sort ()
+  (should (equal (seq-sort #'< "cbaf") "abcf"))
+  (should (equal (seq-sort #'< '(2 1 9 4)) '(1 2 4 9)))
+  (should (equal (seq-sort #'< [2 1 9 4]) [1 2 4 9]))
+  (should (equal (seq-sort #'< "") "")))
+
+(ert-deftest test-seq-uniq ()
+  (with-test-sequences (seq '(2 4 6 8 6 4 3))
+    (should (equal (seq-uniq seq) '(2 4 6 8 3))))
+  (with-test-sequences (seq '(3 3 3 3 3))
+    (should (equal (seq-uniq seq) '(3))))
+  (with-test-sequences (seq '())
+    (should (equal (seq-uniq seq) '()))))
+
+(ert-deftest test-seq-subseq ()
+  (with-test-sequences (seq '(2 3 4 5))
+    (should (equal (seq-subseq seq 0 4) seq))
+    (should (same-contents-p (seq-subseq seq 2 4) '(4 5)))
+    (should (same-contents-p (seq-subseq seq 1 3) '(3 4)))
+    (should (same-contents-p (seq-subseq seq 1 -1) '(3 4))))
+  (should (vectorp (seq-subseq [2 3 4 5] 2)))
+  (should (stringp (seq-subseq "foo" 2 3)))
+  (should (listp (seq-subseq '(2 3 4 4) 2 3)))
+  (should-error (seq-subseq '(1 2 3) 4))
+  (should-not   (seq-subseq '(1 2 3) 3))
+  (should       (seq-subseq '(1 2 3) -3))
+  (should-error (seq-subseq '(1 2 3) 1 4))
+  (should       (seq-subseq '(1 2 3) 1 3))
+  (should-error (seq-subseq '() -1))
+  (should-error (seq-subseq [] -1))
+  (should-error (seq-subseq "" -1))
+  (should-not (seq-subseq '() 0))
+  (should-error (seq-subseq '() 0 -1)))
+
+(ert-deftest test-seq-concatenate ()
+  (with-test-sequences (seq '(2 4 6))
+    (should (equal (seq-concatenate 'string seq [8]) (string 2 4 6 8)))
+    (should (equal (seq-concatenate 'list seq '(8 10)) '(2 4 6 8 10)))
+    (should (equal (seq-concatenate 'vector seq '(8 10)) [2 4 6 8 10]))
+    (should (equal (seq-concatenate 'vector nil '(8 10)) [8 10]))
+    (should (equal (seq-concatenate 'vector seq nil) [2 4 6]))))
+
+(ert-deftest test-seq-mapcat ()
+  (should (equal (seq-mapcat #'seq-reverse '((3 2 1) (6 5 4)))
+                 '(1 2 3 4 5 6)))
+  (should (equal (seq-mapcat #'seq-reverse '[(3 2 1) (6 5 4)])
+                 '(1 2 3 4 5 6)))
+  (should (equal (seq-mapcat #'seq-reverse '((3 2 1) (6 5 4)) 'vector)
+                 '[1 2 3 4 5 6])))
+
+(ert-deftest test-seq-partition ()
+  (should (same-contents-p (seq-partition '(0 1 2 3 4 5 6 7) 3)
+                           '((0 1 2) (3 4 5) (6 7))))
+  (should (same-contents-p (seq-partition '[0 1 2 3 4 5 6 7] 3)
+                           '([0 1 2] [3 4 5] [6 7])))
+  (should (same-contents-p (seq-partition "Hello world" 2)
+                           '("He" "ll" "o " "wo" "rl" "d")))
+  (should (equal (seq-partition '() 2) '()))
+  (should (equal (seq-partition '(1 2 3) -1) '())))
+
+(ert-deftest test-seq-group-by ()
+  (with-test-sequences (seq '(1 2 3 4))
+   (should (equal (seq-group-by #'test-sequences-oddp seq)
+                  '((t 1 3) (nil 2 4)))))
+  (should (equal (seq-group-by #'car '((a 1) (b 3) (c 4) (a 2)))
+                 '((b (b 3)) (c (c 4)) (a (a 1) (a 2))))))
+
+(ert-deftest test-seq-reverse ()
+  (with-test-sequences (seq '(1 2 3 4))
+    (should (same-contents-p (seq-reverse seq) '(4 3 2 1)))
+    (should (equal (type-of (seq-reverse seq))
+                   (type-of seq)))))
+
+(ert-deftest test-seq-into ()
+  (let* ((vector [1 2 3])
+         (list (seq-into vector 'list)))
+    (should (same-contents-p vector list))
+    (should (listp list)))
+  (let* ((list '(hello world))
+         (vector (seq-into list 'vector)))
+    (should (same-contents-p vector list))
+    (should (vectorp vector)))
+  (let* ((string "hello")
+         (list (seq-into string 'list)))
+    (should (same-contents-p string list))
+    (should (stringp string)))
+  (let* ((string "hello")
+         (vector (seq-into string 'vector)))
+    (should (same-contents-p string vector))
+    (should (stringp string)))
+  (let* ((list nil)
+         (vector (seq-into list 'vector)))
+    (should (same-contents-p list vector))
+    (should (vectorp vector))))
+
+(ert-deftest test-seq-intersection ()
+  (let ((v1 [2 3 4 5])
+        (v2 [1 3 5 6 7]))
+    (should (same-contents-p (seq-intersection v1 v2)
+                             '(3 5))))
+  (let ((l1 '(2 3 4 5))
+        (l2 '(1 3 5 6 7)))
+    (should (same-contents-p (seq-intersection l1 l2)
+                             '(3 5))))
+  (let ((v1 [2 4 6])
+        (v2 [1 3 5]))
+    (should (seq-empty-p (seq-intersection v1 v2)))))
+
+(ert-deftest test-seq-difference ()
+  (let ((v1 [2 3 4 5])
+        (v2 [1 3 5 6 7]))
+    (should (same-contents-p (seq-difference v1 v2)
+                             '(2 4))))
+  (let ((l1 '(2 3 4 5))
+        (l2 '(1 3 5 6 7)))
+    (should (same-contents-p (seq-difference l1 l2)
+                             '(2 4))))
+  (let ((v1 [2 4 6])
+        (v2 [2 4 6]))
+    (should (seq-empty-p (seq-difference v1 v2)))))
+
+(ert-deftest test-seq-let ()
+  (with-test-sequences (seq '(1 2 3 4))
+    (seq-let (a b c d e) seq
+      (should (= a 1))
+      (should (= b 2))
+      (should (= c 3))
+      (should (= d 4))
+      (should (null e)))
+    (seq-let (a b &rest others) seq
+      (should (= a 1))
+      (should (= b 2))
+      (should (same-contents-p others (seq-drop seq 2)))))
+  (let ((seq '(1 (2 (3 (4))))))
+    (seq-let (_ (_ (_ (a)))) seq
+      (should (= a 4))))
+  (let (seq)
+    (seq-let (a b c) seq
+      (should (null a))
+      (should (null b))
+      (should (null c)))))
+
+(ert-deftest test-seq-min-max ()
+  (with-test-sequences (seq '(4 5 3 2 0 4))
+    (should (= (seq-min seq) 0))
+    (should (= (seq-max seq) 5))))
+
+(ert-deftest test-seq-into-sequence ()
+  (with-test-sequences (seq '(1 2 3))
+    (should (eq seq (seq-into-sequence seq)))
+    (should-error (seq-into-sequence 2))))
+
+(ert-deftest test-seq-position ()
+  (with-test-sequences (seq '(2 4 6))
+    (should (null (seq-position seq 1)))
+    (should (= (seq-position seq 4) 1)))
+  (let ((seq '(a b c)))
+    (should (null (seq-position seq 'd #'eq)))
+    (should (= (seq-position seq 'a #'eq) 0))
+    (should (null (seq-position seq (make-symbol "a") #'eq)))))
+
+(provide 'seq-tests)
+;;; seq-tests.el ends here