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+;;; test-pearl-assignee-labels.el --- Tests for set-assignee / set-labels -*- 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 the two drawer-field commands that resolve names to ids:
+;; `pearl-set-assignee' and `pearl-set-labels'.  They push via
+;; the generic `--update-issue-async' and update the LINEAR-ASSIGNEE / LABELS
+;; drawer.  The resolver and the mutation are 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))
+
+;;; set-assignee
+
+(ert-deftest test-pearl-set-assignee-pushes-id-and-updates-drawer ()
+  "Setting an assignee resolves the name, pushes the id, and updates the drawer."
+  (let ((pushed nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-TEAM-ID: team-1\n:LINEAR-ASSIGNEE-ID: old\n:LINEAR-ASSIGNEE-NAME: Someone\n:END:\n"
+      (cl-letf (((symbol-function 'pearl--resolve-team-id)
+                 (lambda (_kind _name _team &optional _force) "u9"))
+                ((symbol-function 'pearl--update-issue-async)
+                 (lambda (_id input cb) (setq pushed input) (funcall cb '(:success t)))))
+        (pearl-set-assignee "Craig")
+        (should (string= "u9" (cdr (assoc "assigneeId" pushed))))
+        (should (string= "Craig" (org-entry-get nil "LINEAR-ASSIGNEE-NAME")))
+        (should (string= "u9" (org-entry-get nil "LINEAR-ASSIGNEE-ID")))))))
+
+(ert-deftest test-pearl-set-assignee-unresolvable-errors ()
+  "An unresolvable assignee name signals a user error and pushes nothing."
+  (let ((pushed nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-TEAM-ID: team-1\n:END:\n"
+      (cl-letf (((symbol-function 'pearl--resolve-team-id)
+                 (lambda (&rest _) nil))
+                ((symbol-function 'pearl--update-issue-async)
+                 (lambda (&rest _) (setq pushed t))))
+        (should-error (pearl-set-assignee "Nobody") :type 'user-error)
+        (should-not pushed)))))
+
+(ert-deftest test-pearl-set-assignee-not-on-issue-errors ()
+  "Setting an assignee outside a Linear issue heading signals a user error."
+  (test-pearl--in-org "* Plain heading\nno id\n"
+    (should-error (pearl-set-assignee "Craig") :type 'user-error)))
+
+;;; set-labels
+
+(ert-deftest test-pearl-set-labels-pushes-ids-and-updates-drawer ()
+  "Setting labels resolves each name, pushes the id list, and updates the drawer."
+  (let ((pushed nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-TEAM-ID: team-1\n:LINEAR-LABELS: []\n:END:\n"
+      (cl-letf (((symbol-function 'pearl--resolve-team-id)
+                 (lambda (_kind name _team &optional _force)
+                   (pcase name ("bug" "l1") ("p1" "l2") (_ nil))))
+                ((symbol-function 'pearl--update-issue-async)
+                 (lambda (_id input cb) (setq pushed input) (funcall cb '(:success t)))))
+        (pearl-set-labels '("bug" "p1"))
+        (should (equal '("l1" "l2") (cdr (assoc "labelIds" pushed))))
+        (should (string= "[bug, p1]" (org-entry-get nil "LINEAR-LABELS")))))))
+
+(ert-deftest test-pearl-set-labels-clear-pushes-empty ()
+  "Clearing labels (empty list) pushes an empty id list and empties the drawer."
+  (let ((pushed 'unset))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-TEAM-ID: team-1\n:LINEAR-LABELS: [bug]\n:END:\n"
+      (cl-letf (((symbol-function 'pearl--update-issue-async)
+                 (lambda (_id input cb) (setq pushed input) (funcall cb '(:success t)))))
+        (pearl-set-labels '())
+        (should (equal '() (cdr (assoc "labelIds" pushed))))
+        (should (string= "[]" (org-entry-get nil "LINEAR-LABELS")))))))
+
+(ert-deftest test-pearl-set-labels-unresolvable-errors ()
+  "An unresolvable label name signals a user error and pushes nothing."
+  (let ((pushed nil))
+    (test-pearl--in-org
+        "*** TODO Title\n:PROPERTIES:\n:LINEAR-ID: a\n:LINEAR-TEAM-ID: team-1\n:END:\n"
+      (cl-letf (((symbol-function 'pearl--resolve-team-id)
+                 (lambda (&rest _) nil))
+                ((symbol-function 'pearl--update-issue-async)
+                 (lambda (&rest _) (setq pushed t))))
+        (should-error (pearl-set-labels '("ghost")) :type 'user-error)
+        (should-not pushed)))))
+
+(provide 'test-pearl-assignee-labels)
+;;; test-pearl-assignee-labels.el ends here