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+;;; piem-lei-tests.el --- tests for piem-lei  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  all contributors <piem@inbox.kyleam.com>
+
+;; Author: Kyle Meyer <kyle@kyleam.com>
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'piem-lei)
+
+(ert-deftest piem-lei-query--add-child ()
+  (should-error
+   (piem-lei-query--add-child
+    (make-piem-lei-msg :mid "m1")
+    (make-piem-lei-msg :mid "m1")))
+  (let ((m1 (make-piem-lei-msg :mid "m1"))
+        (m2 (make-piem-lei-msg :mid "m2")))
+    (piem-lei-query--add-child m1 m2)
+    (should (equal (piem-lei-msg-parent m2) m1))
+    (should (equal (piem-lei-msg-children m1) (list m2))))
+  (let ((m1 (make-piem-lei-msg :mid "m1"))
+        (m2 (make-piem-lei-msg :mid "m2"))
+        (m3 (make-piem-lei-msg :mid "m3"))
+        (m4 (make-piem-lei-msg :mid "m4")))
+    (piem-lei-query--add-child m1 m2)
+    (piem-lei-query--add-child m1 m4)
+    (piem-lei-query--add-child m3 m2)
+    (should (equal (piem-lei-msg-parent m2) m3))
+    (should (equal (piem-lei-msg-children m1) (list m4)))
+    (should (equal (piem-lei-msg-children m3) (list m2)))))
+
+(ert-deftest piem-lei-query--has-descendant ()
+  (let ((m1 (make-piem-lei-msg :mid "m1"))
+        (m2 (make-piem-lei-msg :mid "m2")))
+    (should-not
+     (piem-lei-query--has-descendant m1 m2))
+    (should-not
+     (piem-lei-query--has-descendant m2 m1)))
+  (let ((m1 (make-piem-lei-msg :mid "m1")))
+    (should (piem-lei-query--has-descendant m1 m1)))
+  (let ((m1 (make-piem-lei-msg :mid "m1"))
+        (m2 (make-piem-lei-msg :mid "m2")))
+    (piem-lei-query--add-child m1 m2)
+    (should (piem-lei-query--has-descendant m1 m2))
+    (should-not
+     (piem-lei-query--has-descendant m2 m1)))
+  (let ((m1 (make-piem-lei-msg :mid "m1"))
+        (m2 (make-piem-lei-msg :mid "m2"))
+        (m3 (make-piem-lei-msg :mid "m3")))
+    (piem-lei-query--add-child m1 m2)
+    (piem-lei-query--add-child m2 m3)
+    (should (piem-lei-query--has-descendant m1 m2))
+    (should (piem-lei-query--has-descendant m1 m3))
+    (should (piem-lei-query--has-descendant m2 m3))
+    (should-not (piem-lei-query--has-descendant m2 m1))
+    (should-not (piem-lei-query--has-descendant m3 m2))
+    (should-not (piem-lei-query--has-descendant m3 m1))))
+
+(ert-deftest piem-lei-query--elide-subject:keep-original ()
+  (should (equal "ghi jlk"
+                 (piem-lei-query--elide-subject
+                  nil
+                  "ghi jlk")))
+  (should (equal "ghi jlk"
+                 (piem-lei-query--elide-subject
+                  "abc def"
+                  "ghi jlk")))
+  (should (equal "abc def"
+                 (piem-lei-query--elide-subject
+                  "[PATCH] abc def"
+                  "abc def")))
+  (should (equal "abc def"
+                 (piem-lei-query--elide-subject
+                  "[bug#00000] [PATCH] abc def"
+                  "abc def")))
+  (should (equal "abc def"
+                 (piem-lei-query--elide-subject
+                  "[PATCH] abc def"
+                  "abc def")))
+  (should (equal "[bug#00000] [PATCH v2] abc"
+                 (piem-lei-query--elide-subject
+                  "[bug#00000] [PATCH] abc"
+                  "[bug#00000] [PATCH v2] abc")))
+  (should (equal "[bug#00000] [PATCH v2] ghi jlk mno"
+                 (piem-lei-query--elide-subject
+                  "[bug#00000] [PATCH] abc def"
+                  "[bug#00000] [PATCH v2] ghi jlk mno"))))
+
+(defvar piem-lei-tests-elide-string (if (char-displayable-p ?…) "…" "..."))
+
+(ert-deftest piem-lei-query--elide-subject:elide ()
+  (should (equal (concat "[PATCH v2] " piem-lei-tests-elide-string)
+                 (piem-lei-query--elide-subject
+                  "[PATCH] abc def"
+                  "[PATCH v2] abc def")))
+  (should (equal (concat "[bug#00000] [PATCH v2] " piem-lei-tests-elide-string)
+                 (piem-lei-query--elide-subject
+                  "[bug#00000] [PATCH] abc def"
+                  "[bug#00000] [PATCH v2] abc def")))
+  (should (equal (concat "bug#00000: [PATCH v2] " piem-lei-tests-elide-string)
+                 (piem-lei-query--elide-subject
+                  "[bug#00000] [PATCH] abc def"
+                  "bug#00000: [PATCH v2] abc def"))))
+
+(provide 'piem-lei-tests)
+;;; piem-lei-tests.el ends here