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+;;; test-pearl-org-write.el --- Tests for pearl org file write-back -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2026 Craig Jennings
+
+;; Author: Craig Jennings <c@cjennings.net>
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Tests for `pearl--update-org-from-issues', the buffer-aware
+;; write-back.  Uses real temp files (file I/O is the behavior under test);
+;; the three branches are no-buffer, clean-buffer, and dirty-buffer.
+
+;;; Code:
+
+(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
+
+(defvar test-pearl--sample-issues
+  '((:id "u" :identifier "ENG-1" :title "T" :priority 3 :state (:name "Todo")))
+  "One normalized issue, enough to render a recognizable org entry.")
+
+(defmacro test-pearl--with-org-file (var &rest body)
+  "Bind VAR to a fresh temp .org path and run BODY, cleaning up after.
+The state mapping is bound so rendering is deterministic."
+  (declare (indent 1))
+  `(let* ((,var (make-temp-file "linear-test-" nil ".org"))
+          (pearl-org-file-path ,var)
+          (pearl-state-to-todo-mapping '(("Todo" . "TODO"))))
+     (unwind-protect
+         (progn ,@body)
+       (let ((b (find-buffer-visiting ,var)))
+         (when b
+           (with-current-buffer b (set-buffer-modified-p nil))
+           (kill-buffer b)))
+       (when (file-exists-p ,var) (delete-file ,var)))))
+
+(ert-deftest test-pearl-update-org-no-buffer-writes-file ()
+  "With no buffer visiting the file, issues are written to disk."
+  (test-pearl--with-org-file tmp
+    (let ((b (find-buffer-visiting tmp))) (when b (kill-buffer b)))
+    (pearl--update-org-from-issues test-pearl--sample-issues)
+    (let ((content (with-temp-buffer (insert-file-contents tmp) (buffer-string))))
+      (should (string-match-p "#\\+title: Linear" content))
+      (should (string-match-p "#\\+LINEAR-SOURCE: " content))
+      (should (string-match-p "\\*\\* TODO \\[#C\\] T" content)))))
+
+(ert-deftest test-pearl-update-org-clean-buffer-replaces-contents ()
+  "A clean visiting buffer is replaced in place and saved."
+  (test-pearl--with-org-file tmp
+    (let ((buf (find-file-noselect tmp)))
+      (with-current-buffer buf
+        (insert "old content")
+        (save-buffer))
+      (pearl--update-org-from-issues test-pearl--sample-issues)
+      (with-current-buffer buf
+        (should-not (buffer-modified-p))
+        (should (string-match-p "\\*\\* TODO \\[#C\\] T" (buffer-string)))
+        (should-not (string-match-p "old content" (buffer-string)))))))
+
+(ert-deftest test-pearl-update-org-dirty-buffer-not-overwritten ()
+  "A buffer with unsaved edits is left untouched, not clobbered."
+  (test-pearl--with-org-file tmp
+    (let ((buf (find-file-noselect tmp)))
+      (with-current-buffer buf
+        (insert "unsaved edits"))
+      (pearl--update-org-from-issues test-pearl--sample-issues)
+      (with-current-buffer buf
+        (should (buffer-modified-p))
+        (should (string-match-p "unsaved edits" (buffer-string)))
+        (should-not (string-match-p "ENG-1" (buffer-string)))))))
+
+(provide 'test-pearl-org-write)
+;;; test-pearl-org-write.el ends here