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+;;; test-org-noter--title-to-slug.el --- Tests for cj/org-noter--title-to-slug -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; ERT tests for the title-to-slug function used in org-noter workflow.
+;; Tests cover normal, boundary, and error cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'org-noter-config)
+
+;;; Normal Cases
+
+(ert-deftest test-org-noter--title-to-slug-normal-simple-title ()
+  "Normal case: Simple title with spaces."
+  (should (equal (cj/org-noter--title-to-slug "The Pragmatic Programmer")
+                 "the-pragmatic-programmer")))
+
+(ert-deftest test-org-noter--title-to-slug-normal-single-word ()
+  "Normal case: Single word title."
+  (should (equal (cj/org-noter--title-to-slug "Dune")
+                 "dune")))
+
+(ert-deftest test-org-noter--title-to-slug-normal-with-numbers ()
+  "Normal case: Title with numbers."
+  (should (equal (cj/org-noter--title-to-slug "1984 by George Orwell")
+                 "1984-by-george-orwell")))
+
+(ert-deftest test-org-noter--title-to-slug-normal-mixed-case ()
+  "Normal case: Title with mixed case."
+  (should (equal (cj/org-noter--title-to-slug "SICP Structure and Interpretation")
+                 "sicp-structure-and-interpretation")))
+
+;;; Boundary Cases
+
+(ert-deftest test-org-noter--title-to-slug-boundary-special-chars ()
+  "Boundary case: Title with special characters."
+  (should (equal (cj/org-noter--title-to-slug "C++: The Complete Guide")
+                 "c-the-complete-guide")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-punctuation ()
+  "Boundary case: Title with punctuation."
+  (should (equal (cj/org-noter--title-to-slug "Why's (Poignant) Guide to Ruby")
+                 "why-s-poignant-guide-to-ruby")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-leading-special ()
+  "Boundary case: Title starting with special character."
+  (should (equal (cj/org-noter--title-to-slug "...And Then There Were None")
+                 "and-then-there-were-none")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-trailing-special ()
+  "Boundary case: Title ending with special character."
+  (should (equal (cj/org-noter--title-to-slug "What Is This Thing Called Love?")
+                 "what-is-this-thing-called-love")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-multiple-spaces ()
+  "Boundary case: Title with multiple consecutive spaces."
+  (should (equal (cj/org-noter--title-to-slug "The   Great    Gatsby")
+                 "the-great-gatsby")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-underscores ()
+  "Boundary case: Title with underscores."
+  (should (equal (cj/org-noter--title-to-slug "file_name_example")
+                 "file-name-example")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-hyphens ()
+  "Boundary case: Title with existing hyphens."
+  (should (equal (cj/org-noter--title-to-slug "Self-Reliance")
+                 "self-reliance")))
+
+(ert-deftest test-org-noter--title-to-slug-boundary-all-numbers ()
+  "Boundary case: Title that is all numbers."
+  (should (equal (cj/org-noter--title-to-slug "2001")
+                 "2001")))
+
+;;; Edge Cases
+
+(ert-deftest test-org-noter--title-to-slug-edge-empty-string ()
+  "Edge case: Empty string."
+  (should (equal (cj/org-noter--title-to-slug "")
+                 "")))
+
+(ert-deftest test-org-noter--title-to-slug-edge-only-special-chars ()
+  "Edge case: Only special characters."
+  (should (equal (cj/org-noter--title-to-slug "!@#$%^&*()")
+                 "")))
+
+(ert-deftest test-org-noter--title-to-slug-edge-unicode ()
+  "Edge case: Title with unicode characters."
+  (should (equal (cj/org-noter--title-to-slug "Café au Lait")
+                 "caf-au-lait")))
+
+(ert-deftest test-org-noter--title-to-slug-edge-long-title ()
+  "Edge case: Very long title."
+  (let ((long-title "The Absolutely Incredibly Long Title of This Book That Goes On and On"))
+    (should (equal (cj/org-noter--title-to-slug long-title)
+                   "the-absolutely-incredibly-long-title-of-this-book-that-goes-on-and-on"))))
+
+(provide 'test-org-noter--title-to-slug)
+;;; test-org-noter--title-to-slug.el ends here