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+;;; test-org-noter-config--title-to-slug.el --- Tests for cj/org-noter--title-to-slug -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for `cj/org-noter--title-to-slug'. The function lowercases its
+;; input, replaces every run of non-alphanumeric characters with a
+;; single hyphen, and trims leading/trailing hyphens. It's used to
+;; turn a book title into a filename-safe slug.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'user-constants)
+(require 'keybindings)
+(require 'org-noter-config)
+
+(ert-deftest test-org-noter-config-title-to-slug-multi-word ()
+  "Normal: a multi-word title becomes hyphen-separated lowercase."
+  (should (equal "the-pragmatic-programmer"
+                 (cj/org-noter--title-to-slug "The Pragmatic Programmer"))))
+
+(ert-deftest test-org-noter-config-title-to-slug-single-word ()
+  "Normal: a single-word lowercase title is unchanged."
+  (should (equal "anaphora" (cj/org-noter--title-to-slug "anaphora"))))
+
+(ert-deftest test-org-noter-config-title-to-slug-mixed-punctuation ()
+  "Boundary: punctuation is collapsed into single hyphens."
+  (should (equal "godel-escher-bach"
+                 (cj/org-noter--title-to-slug "Godel, Escher, Bach!"))))
+
+(ert-deftest test-org-noter-config-title-to-slug-leading-trailing-non-alnum ()
+  "Boundary: leading and trailing non-alnum runs are trimmed."
+  (should (equal "title"
+                 (cj/org-noter--title-to-slug "  ...title!?? "))))
+
+(ert-deftest test-org-noter-config-title-to-slug-collapses-multiple-non-alnum ()
+  "Boundary: a run of non-alnum chars in the middle becomes one hyphen."
+  (should (equal "a-b" (cj/org-noter--title-to-slug "a   ---   b"))))
+
+(ert-deftest test-org-noter-config-title-to-slug-numbers-preserved ()
+  "Boundary: digits are preserved as-is."
+  (should (equal "1984" (cj/org-noter--title-to-slug "1984"))))
+
+(ert-deftest test-org-noter-config-title-to-slug-empty-string ()
+  "Error: empty input yields empty string."
+  (should (equal "" (cj/org-noter--title-to-slug ""))))
+
+(provide 'test-org-noter-config--title-to-slug)
+;;; test-org-noter-config--title-to-slug.el ends here