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+;;; tildify-test.el --- ERT tests for tildify.el
+
+;; Copyright (C) 2014 Free Software Foundation, Inc.
+
+;; Author:     Michal Nazarewicz <mina86@mina86.com>
+;; Version:    4.5
+;; Keywords:   text, TeX, SGML, wp
+
+;; 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:
+
+;; This package defines regression tests for the tildify package.
+
+;;; Code:
+
+(require 'ert)
+(require 'tildify)
+
+(defun tildify-test--example-sentence (space)
+  "Return an example sentence with SPACE where hard space is required."
+  (concat "Lorem ipsum v" space "dolor sit amet, a" space
+          "consectetur adipiscing elit."))
+
+
+(defun tildify-test--example-html (sentence &optional with-nbsp is-xml)
+  "Return an example HTML code.
+SENTENCE is placed where spaces should not be replaced with hard spaces, and
+WITH-NBSP is placed where spaces should be replaced with hard spaces.  If the
+latter is missing, SENTENCE will be used in all placeholder positions.
+If IS-XML is non-nil, <pre> tag is not treated specially."
+  (let ((with-nbsp (or with-nbsp sentence)))
+    (concat "<p>" with-nbsp "</p>\n"
+            "<pre>" (if is-xml with-nbsp sentence) "</pre>\n"
+            "<! -- " sentence " -- >\n"
+            "<p>" with-nbsp "</p>\n"
+            "<" sentence ">\n")))
+
+
+(defun tildify-test--test (modes input expected)
+  "Test tildify running in MODES.
+INPUT is the initial content of the buffer and EXPECTED is expected result
+after `tildify-buffer' is run."
+  (with-temp-buffer
+    (dolist (mode modes)
+      (erase-buffer)
+      (funcall mode)
+      (let ((header (concat "Testing `tildify-buffer' in "
+                            (symbol-name mode) "\n")))
+        (insert header input)
+        (tildify-buffer t)
+        (should (string-equal (concat header expected) (buffer-string))))
+      (erase-buffer)
+      (let ((header (concat "Testing `tildify-region' in "
+                            (symbol-name mode) "\n")))
+        (insert header input)
+        (tildify-region (point-min) (point-max) t)
+        (should (string-equal (concat header expected) (buffer-string)))))))
+
+(ert-deftest tildify-test-html ()
+  "Tests tildification in an HTML document"
+  (let* ((sentence (tildify-test--example-sentence " "))
+         (with-nbsp (tildify-test--example-sentence "&nbsp;")))
+    (tildify-test--test '(html-mode sgml-mode)
+                        (tildify-test--example-html sentence sentence)
+                        (tildify-test--example-html sentence with-nbsp))))
+
+(ert-deftest tildify-test-xml ()
+  "Tests tildification in an XML document"
+  (let* ((sentence (tildify-test--example-sentence " "))
+         (with-nbsp (tildify-test--example-sentence "&#160;")))
+    (tildify-test--test '(nxml-mode)
+                        (tildify-test--example-html sentence sentence t)
+                        (tildify-test--example-html sentence with-nbsp t))))
+
+
+(defun tildify-test--example-tex (sentence &optional with-nbsp)
+  "Return an example (La)Tex code.
+SENTENCE is placed where spaces should not be replaced with hard spaces, and
+WITH-NBSP is placed where spaces should be replaced with hard spaces.  If the
+latter is missing, SENTENCE will be used in all placeholder positions."
+  (let ((with-nbsp (or with-nbsp sentence)))
+    (concat with-nbsp "\n"
+            "\\begin{verbatim}\n" sentence "\n\\end{verbatim}\n"
+            "\\verb#" sentence "#\n"
+            "$$" sentence "$$\n"
+            "$" sentence "$\n"
+            "\\[" sentence "\\]\n"
+            "\\v A % " sentence "\n"
+            with-nbsp "\n")))
+
+(ert-deftest tildify-test-tex ()
+  "Tests tildification in a (La)TeX document"
+  (let* ((sentence (tildify-test--example-sentence " "))
+         (with-nbsp (tildify-test--example-sentence "~")))
+    (tildify-test--test '(tex-mode latex-mode plain-tex-mode)
+                        (tildify-test--example-tex sentence sentence)
+                        (tildify-test--example-tex sentence with-nbsp))))
+
+
+(ert-deftest tildify-test-find-env-end-re-bug ()
+    "Tests generation of end-regex using mix of indexes and strings"
+  (with-temp-buffer
+    (insert "foo whatever end-foo")
+    (goto-char (point-min))
+    (should (string-equal "end-foo"
+                          (tildify-find-env "foo\\|bar"
+                                            '(("foo\\|bar" . ("end-" 0))))))))
+
+
+(ert-deftest tildify-test-find-env-group-index-bug ()
+    "Tests generation of match-string indexes"
+  (with-temp-buffer
+    (let ((pairs '(("start-\\(foo\\|bar\\)" . ("end-" 1))
+                   ("open-\\(foo\\|bar\\)" . ("close-" 1))))
+          (beg-re "start-\\(foo\\|bar\\)\\|open-\\(foo\\|bar\\)"))
+      (insert "open-foo whatever close-foo")
+      (goto-char (point-min))
+      (should (string-equal "close-foo" (tildify-find-env beg-re pairs))))))
+
+
+(provide 'tildify-tests)
+
+;;; tildify-tests.el ends here