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diff --git a/tests/test-auto-dim-config.el b/tests/test-auto-dim-config.el
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+++ b/tests/test-auto-dim-config.el
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+;;; test-auto-dim-config.el --- Tests for the auto-dim-other-buffers config -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; auto-dim-config configures the local auto-dim-other-buffers fork: dim only
+;; non-selected windows within Emacs (not the whole frame on focus-out), drop
+;; fringe from the dimmed faces to avoid flicker on this non-pgtk build, and
+;; enable the global mode.  Guarded with `skip-unless' because the fork lives
+;; in ~/code and may be absent on a clean checkout.
+
+;;; Code:
+
+(require 'ert)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+
+(defconst test-auto-dim--fork
+  (expand-file-name "~/code/auto-dim-other-buffers.el")
+  "Local fork directory the module loads via `:load-path'.")
+
+(ert-deftest test-auto-dim-config-applies-settings ()
+  "Normal: loading the module enables the mode with the chosen settings."
+  (skip-unless (file-directory-p test-auto-dim--fork))
+  (require 'auto-dim-config)
+  (unwind-protect
+      (progn
+        (should (bound-and-true-p auto-dim-other-buffers-mode))
+        (should (null auto-dim-other-buffers-dim-on-focus-out))
+        (should (eq t auto-dim-other-buffers-dim-on-switch-to-minibuffer))
+        (should-not (assq 'fringe auto-dim-other-buffers-affected-faces)))
+    (when (fboundp 'auto-dim-other-buffers-mode)
+      (auto-dim-other-buffers-mode -1))))
+
+(provide 'test-auto-dim-config)
+;;; test-auto-dim-config.el ends here