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+;;; test-prog-lisp.el --- Smoke tests for prog-lisp owned config -*- lexical-binding: t; -*-
+
+;;; Commentary:
+
+;; prog-lisp.el is mostly use-package config; the behavior it owns directly is
+;; the two mode-setup functions and their hook registration.  These tests load
+;; the module with use-package stubbed to a no-op, so no packages load, ensure,
+;; or download in batch, then assert the setup hooks are registered and apply
+;; the buffer-local conventions this config sets.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+
+(defconst test-prog-lisp--repo-root
+  (file-name-directory
+   (directory-file-name
+    (file-name-directory (or load-file-name buffer-file-name))))
+  "Repository root, derived from this file's location under tests/.")
+
+(defun test-prog-lisp--load ()
+  "Load prog-lisp.el with use-package stubbed so no packages load or install."
+  (cl-letf (((symbol-function 'use-package)
+             (cons 'macro (lambda (&rest _) nil))))
+    (load (expand-file-name "modules/prog-lisp.el" test-prog-lisp--repo-root)
+          nil t)))
+
+;;; cj/elisp-setup
+
+(ert-deftest test-prog-lisp-elisp-setup-registered ()
+  "Normal: the elisp setup function is added to emacs-lisp-mode-hook."
+  (let ((emacs-lisp-mode-hook nil))
+    (test-prog-lisp--load)
+    (should (memq 'cj/elisp-setup emacs-lisp-mode-hook))))
+
+(ert-deftest test-prog-lisp-elisp-setup-sets-buffer-locals ()
+  "Normal: elisp setup uses 4-space indent, no tabs, fill-column 120."
+  (test-prog-lisp--load)
+  (with-temp-buffer
+    (cl-letf (((symbol-function 'display-fill-column-indicator-mode) #'ignore))
+      (cj/elisp-setup)
+      (should (= tab-width 4))
+      (should (null indent-tabs-mode))
+      (should (= fill-column 120)))))
+
+;;; cj/common-lisp-setup
+
+(ert-deftest test-prog-lisp-common-lisp-setup-registered ()
+  "Normal: the Common Lisp setup function is added to lisp-mode-hook."
+  (let ((lisp-mode-hook nil))
+    (test-prog-lisp--load)
+    (should (memq 'cj/common-lisp-setup lisp-mode-hook))))
+
+(ert-deftest test-prog-lisp-common-lisp-setup-sets-buffer-locals ()
+  "Normal: Common Lisp setup uses 2-space indent, no tabs, fill-column 100."
+  (test-prog-lisp--load)
+  (with-temp-buffer
+    (cj/common-lisp-setup)
+    (should (= tab-width 2))
+    (should (null indent-tabs-mode))
+    (should (= fill-column 100))))
+
+(provide 'test-prog-lisp)
+;;; test-prog-lisp.el ends here