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+;;; test-pearl-config.el --- Tests for pearl config helpers -*- 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:
+
+;; Unit tests for the small config / state helpers: `pearl--headers',
+;; `pearl-toggle-debug', and `pearl-load-api-key-from-env'.
+
+;;; Code:
+
+(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
+
+;;; pearl--headers
+
+(ert-deftest test-pearl-headers-no-key-errors ()
+  "Building headers without an API key signals an error."
+  (let ((pearl-api-key nil))
+    (should-error (pearl--headers))))
+
+(ert-deftest test-pearl-headers-with-key-sets-authorization ()
+  "With a key set, the Authorization header carries the raw key (no Bearer)."
+  (let ((pearl-api-key "lin_api_abc123"))
+    (let ((headers (pearl--headers)))
+      (should (string-equal "lin_api_abc123" (cdr (assoc "Authorization" headers))))
+      (should (string-equal "application/json" (cdr (assoc "Content-Type" headers)))))))
+
+;;; pearl-toggle-debug
+
+(ert-deftest test-pearl-toggle-debug-flips-from-nil ()
+  "Toggling from nil enables debug."
+  (let ((pearl-debug nil))
+    (pearl-toggle-debug)
+    (should (eq t pearl-debug))))
+
+(ert-deftest test-pearl-toggle-debug-flips-from-t ()
+  "Toggling from t disables debug."
+  (let ((pearl-debug t))
+    (pearl-toggle-debug)
+    (should (null pearl-debug))))
+
+;;; pearl-load-api-key-from-env
+
+(ert-deftest test-pearl-load-api-key-from-env-present ()
+  "When LINEAR_API_KEY is set, the key is loaded into the variable."
+  (let ((process-environment (cons "LINEAR_API_KEY=env-key-xyz" process-environment))
+        (pearl-api-key nil))
+    (pearl-load-api-key-from-env)
+    (should (string-equal "env-key-xyz" pearl-api-key))))
+
+(ert-deftest test-pearl-load-api-key-from-env-absent-leaves-key ()
+  "When LINEAR_API_KEY is unset, the key variable is left unchanged."
+  (let ((process-environment
+         (seq-remove (lambda (e) (string-prefix-p "LINEAR_API_KEY=" e))
+                     process-environment))
+        (pearl-api-key nil))
+    (pearl-load-api-key-from-env)
+    (should (null pearl-api-key))))
+
+(provide 'test-pearl-config)
+;;; test-pearl-config.el ends here