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+;;; occur-testsuite.el --- Test suite for occur.
+
+;; Copyright (C) 2010  Free Software Foundation, Inc.
+
+;; Author: Juri Linkov <juri@jurta.org>
+;; Keywords: matching, internal
+
+;; 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:
+
+;; Type M-x test-occur RET to test the functionality of `occur'.
+
+;;; Code:
+
+(defconst occur-tests
+  '(
+    ;; * Test one-line matches (at bob, eob, bol, eol).
+    ("x" 0 "\
+xa
+b
+cx
+xd
+xex
+fx
+" "\
+5 matches for \"x\" in buffer:  *temp*
+      1:xa
+      3:cx
+      4:xd
+      5:xex
+      6:fx
+")
+    ;; * Test multi-line matches, this is the first test from
+    ;; http://lists.gnu.org/archive/html/emacs-devel/2005-06/msg01008.html
+    ;; where numbers are replaced with letters.
+    ("a\na" 0 "\
+a
+a
+a
+a
+a
+" "\
+2 matches for \"a^Ja\" in buffer:  *temp*
+      1:a
+       :a
+      3:a
+       :a
+")
+    ;; * Test multi-line matches, this is the second test from
+    ;; http://lists.gnu.org/archive/html/emacs-devel/2005-06/msg01008.html
+    ;; where numbers are replaced with letters.
+    ("a\nb" 0 "\
+a
+b
+c
+a
+b
+" "\
+2 matches for \"a^Jb\" in buffer:  *temp*
+      1:a
+       :b
+      4:a
+       :b
+")
+    ;; * Test line numbers for multi-line matches with empty last match line.
+    ("a\n" 0 "\
+a
+
+c
+a
+
+" "\
+2 matches for \"a^J\" in buffer:  *temp*
+      1:a
+       :
+      4:a
+       :
+")
+    ;; * Test multi-line matches with 3 match lines.
+    ("x\n.x\n" 0 "\
+ax
+bx
+c
+d
+ex
+fx
+" "\
+2 matches for \"x^J.x^J\" in buffer:  *temp*
+      1:ax
+       :bx
+       :c
+      5:ex
+       :fx
+       :
+")
+    ;; * Test non-overlapping context lines with matches at bob/eob.
+    ("x" 1 "\
+ax
+b
+c
+d
+ex
+f
+g
+hx
+" "\
+3 matches for \"x\" in buffer:  *temp*
+      1:ax
+       :b
+-------
+       :d
+      5:ex
+       :f
+-------
+       :g
+      8:hx
+")
+    ;; * Test non-overlapping context lines with matches not at bob/eob.
+    ("x" 1 "\
+a
+bx
+c
+d
+ex
+f
+" "\
+2 matches for \"x\" in buffer:  *temp*
+       :a
+      2:bx
+       :c
+-------
+       :d
+      5:ex
+       :f
+")
+    ;; * Test overlapping context lines with matches at bob/eob.
+    ("x" 2 "\
+ax
+bx
+c
+dx
+e
+f
+gx
+h
+i
+j
+kx
+" "\
+5 matches for \"x\" in buffer:  *temp*
+      1:ax
+      2:bx
+       :c
+      4:dx
+       :e
+       :f
+      7:gx
+       :h
+       :i
+       :j
+     11:kx
+")
+    ;; * Test overlapping context lines with matches not at bob/eob.
+    ("x" 2 "\
+a
+b
+cx
+d
+e
+f
+gx
+h
+i
+" "\
+2 matches for \"x\" in buffer:  *temp*
+       :a
+       :b
+      3:cx
+       :d
+       :e
+       :f
+      7:gx
+       :h
+       :i
+")
+    ;; * Test overlapping context lines with empty first and last line..
+    ("x" 2 "\
+
+b
+cx
+d
+e
+f
+gx
+h
+
+" "\
+2 matches for \"x\" in buffer:  *temp*
+       :
+       :b
+      3:cx
+       :d
+       :e
+       :f
+      7:gx
+       :h
+       :
+")
+    ;; * Test multi-line overlapping context lines.
+    ("x\n.x" 2 "\
+ax
+bx
+c
+d
+ex
+fx
+g
+h
+i
+jx
+kx
+" "\
+3 matches for \"x^J.x\" in buffer:  *temp*
+      1:ax
+       :bx
+       :c
+       :d
+      5:ex
+       :fx
+       :g
+       :h
+       :i
+     10:jx
+       :kx
+")
+    ;; * Test multi-line non-overlapping context lines.
+    ("x\n.x" 2 "\
+ax
+bx
+c
+d
+e
+f
+gx
+hx
+" "\
+2 matches for \"x^J.x\" in buffer:  *temp*
+      1:ax
+       :bx
+       :c
+       :d
+-------
+       :e
+       :f
+      7:gx
+       :hx
+")
+    ;; * Test non-overlapping negative (before-context) lines.
+    ("x" -2 "\
+a
+bx
+c
+d
+e
+fx
+g
+h
+ix
+" "\
+3 matches for \"x\" in buffer:  *temp*
+       :a
+      2:bx
+-------
+       :d
+       :e
+      6:fx
+-------
+       :g
+       :h
+      9:ix
+")
+    ;; * Test overlapping negative (before-context) lines.
+    ("x" -3 "\
+a
+bx
+c
+dx
+e
+f
+gx
+h
+" "\
+3 matches for \"x\" in buffer:  *temp*
+       :a
+      2:bx
+       :c
+      4:dx
+       :e
+       :f
+      7:gx
+")
+
+)
+  "List of tests for `occur'.
+Each element has the format:
+\(REGEXP NLINES INPUT-BUFFER-STRING OUTPUT-BUFFER-STRING).")
+
+(defun test-occur ()
+  (interactive)
+  (let ((count 1)
+        failed
+        (occur-hook nil))
+    (dolist (test occur-tests)
+      (let ((regexp (nth 0 test))
+            (nlines (nth 1 test))
+            (input-buffer-string (nth 2 test))
+            (output-buffer-string (nth 3 test)))
+        (save-excursion
+          (with-temp-buffer
+            (insert input-buffer-string)
+            (occur regexp nlines)
+            (unless (equal output-buffer-string
+                           (with-current-buffer "*Occur*"
+                             (buffer-string)))
+              (setq failed (cons count failed))))))
+      (setq count (1+ count)))
+    (if failed
+        (message "FAILED TESTS: %S" (reverse failed))
+      (message "SUCCESS"))))
+
+(provide 'occur-testsuite)
+
+;;; occur-testsuite.el ends here