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+;;; test-pearl-open.el --- Tests for open-issue-in-browser -*- 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-open-current-issue', which opens the issue at point
+;; in the browser from its LINEAR-URL property.  `browse-url' is stubbed.
+
+;;; Code:
+
+(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
+(require 'cl-lib)
+
+(defmacro test-pearl--in-org (content &rest body)
+  "Run BODY in an org-mode temp buffer holding CONTENT at point-min."
+  (declare (indent 1))
+  `(with-temp-buffer
+     (insert ,content)
+     (org-mode)
+     (goto-char (point-min))
+     ,@body))
+
+(ert-deftest test-pearl-open-current-issue-visits-url ()
+  "The command passes the heading's LINEAR-URL to `browse-url'."
+  (let ((visited nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-URL: https://linear.app/x/ENG-1\n:END:\nbody\n"
+      (cl-letf (((symbol-function 'browse-url)
+                 (lambda (url &rest _) (setq visited url))))
+        (goto-char (point-max))
+        (pearl-open-current-issue)
+        (should (string= "https://linear.app/x/ENG-1" visited))))))
+
+(ert-deftest test-pearl-open-current-issue-no-url-errors ()
+  "An issue heading without a LINEAR-URL signals a user error, no browse."
+  (let ((visited nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:END:\n"
+      (cl-letf (((symbol-function 'browse-url)
+                 (lambda (url &rest _) (setq visited url))))
+        (should-error (pearl-open-current-issue) :type 'user-error)
+        (should-not visited)))))
+
+(ert-deftest test-pearl-open-current-issue-not-on-issue-errors ()
+  "Running outside a heading signals a user error."
+  (test-pearl--in-org "plain text, no heading\n"
+    (should-error (pearl-open-current-issue) :type 'user-error)))
+
+(provide 'test-pearl-open)
+;;; test-pearl-open.el ends here