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+;;; gnus-search-tests.el --- Tests for Gnus' search routines  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017, 2021-2022 Free Software Foundation, Inc.
+
+;; Author: Eric Abrahamsen <eric@ericabrahamsen.net>
+;; 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:
+
+;; Tests for the search parsing, search engines, and their
+;; transformations.
+
+;;; Code:
+
+(require 'ert)
+(require 'gnus-search)
+
+(ert-deftest gnus-s-parse ()
+  "Test basic structural parsing."
+  (let ((pairs
+         '(("string" . ("string"))
+           ("from:john" . ((from . "john")))
+           ("here and there" . ("here" and "there"))
+           ("here or there" . ((or "here" "there")))
+           ("here (there or elsewhere)" . ("here" ((or "there" "elsewhere"))))
+           ("here not there" . ("here" (not "there")))
+           ("from:boss or not vacation" . ((or (from . "boss") (not "vacation")))))))
+    (dolist (p pairs)
+      (should (equal (gnus-search-parse-query (car p)) (cdr p))))))
+
+(ert-deftest gnus-s-expand-keyword ()
+  "Test expansion of keywords"
+  (let ((gnus-search-expandable-keys
+         (default-value 'gnus-search-expandable-keys))
+        (pairs
+         '(("su" . "subject")
+           ("sin" . "since")
+           ("body" . "body")
+           ("list-id" . "list-id"))))
+    (dolist (p pairs)
+      (should (equal (gnus-search-query-expand-key (car p))
+                     (cdr p))))
+    (should-error (gnus-search-query-expand-key "s")
+                  :type 'gnus-search-parse-error)))
+
+(ert-deftest gnus-s-parse-date ()
+  "Test parsing of date expressions."
+  (let ((rel-date (encode-time 0 0 0 15 4 2017))
+        (pairs
+         '(("January" . (nil 1 nil))
+           ("2017" . (nil nil 2017))
+           ("15" . (15 nil nil))
+           ("January 15" . (15 1 nil))
+           ("tuesday" . (11 4 2017))
+           ("1d" . (14 4 2017))
+           ("1w" . (8 4 2017)))))
+    (dolist (p pairs)
+      (should (equal (gnus-search-query-parse-date (car p) rel-date)
+                     (cdr p))))))
+
+(ert-deftest gnus-s-delimited-string ()
+  "Test proper functioning of `gnus-search-query-return-string'."
+  (with-temp-buffer
+    (insert "one\ntwo words\nthree \"words with quotes\"\n\"quotes at start\"\n/alternate \"quotes\"/\n(more bits)")
+    (goto-char (point-min))
+    (should (string= (gnus-search-query-return-string)
+                     "one"))
+    (forward-line)
+    (should (string= (gnus-search-query-return-string)
+                     "two"))
+    (forward-line)
+    (should (string= (gnus-search-query-return-string)
+                     "three"))
+    (forward-line)
+    (should (string= (gnus-search-query-return-string "\"")
+                     "\"quotes at start\""))
+    (forward-line)
+    (should (string= (gnus-search-query-return-string "/")
+                     "/alternate \"quotes\"/"))
+    (forward-line)
+    (should (string= (gnus-search-query-return-string ")" t)
+                     "more bits"))))
+
+(provide 'gnus-search-tests)
+;;; gnus-search-tests.el ends here