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+;;; test-custom-ordering-wrappers.el --- Tests for the user-facing ordering wrappers -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Sibling tests cover each `cj/--<op>' internal in isolation.  This
+;; file covers the buffer-mutating wrapper commands:
+;;
+;;   cj/arrayify, cj/listify, cj/arrayify-json, cj/arrayify-python
+;;   cj/unarrayify
+;;   cj/toggle-quotes
+;;   cj/reverse-lines
+;;   cj/number-lines
+;;   cj/alphabetize-region
+;;   cj/comma-separated-text-to-lines
+;;
+;; Each test runs the wrapper inside `with-temp-buffer' with the whole
+;; buffer as the region and asserts the contents after replacement.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'custom-ordering)
+
+(defmacro test-custom-ordering--with (input &rest body)
+  "Insert INPUT into a temp buffer, evaluate BODY, return buffer string."
+  (declare (indent 1))
+  `(with-temp-buffer
+     (insert ,input)
+     (set-mark (point-min))
+     (goto-char (point-max))
+     ,@body
+     (buffer-string)))
+
+;;; cj/arrayify (quoted, comma-separated)
+
+(ert-deftest test-custom-ordering-arrayify-replaces-region-with-quoted-list ()
+  "Normal: arrayify quotes every word and joins with \", \"."
+  (let ((result (test-custom-ordering--with "apple banana cherry"
+                  (cj/arrayify (point-min) (point-max) "'"))))
+    (should (equal result "'apple', 'banana', 'cherry'"))))
+
+;;; cj/listify (unquoted)
+
+(ert-deftest test-custom-ordering-listify-joins-with-comma-space ()
+  "Normal: listify produces a bare comma-separated list."
+  (let ((result (test-custom-ordering--with "apple banana cherry"
+                  (cj/listify (point-min) (point-max)))))
+    (should (equal result "apple, banana, cherry"))))
+
+;;; cj/arrayify-json
+
+(ert-deftest test-custom-ordering-arrayify-json-wraps-in-brackets ()
+  "Normal: arrayify-json wraps the quoted list in square brackets."
+  (let ((result (test-custom-ordering--with "apple banana"
+                  (cj/arrayify-json (point-min) (point-max)))))
+    (should (equal result "[\"apple\", \"banana\"]"))))
+
+;;; cj/arrayify-python
+
+(ert-deftest test-custom-ordering-arrayify-python-wraps-in-brackets ()
+  "Normal: arrayify-python wraps the quoted list in square brackets."
+  (let ((result (test-custom-ordering--with "apple banana"
+                  (cj/arrayify-python (point-min) (point-max)))))
+    (should (equal result "[\"apple\", \"banana\"]"))))
+
+;;; cj/unarrayify
+
+(ert-deftest test-custom-ordering-unarrayify-splits-on-comma-space ()
+  "Normal: unarrayify splits on \", \" and strips quotes."
+  (let ((result (test-custom-ordering--with "'a', 'b', 'c'"
+                  (cj/unarrayify (point-min) (point-max)))))
+    (should (equal result "a\nb\nc"))))
+
+;;; cj/toggle-quotes
+
+(ert-deftest test-custom-ordering-toggle-quotes-swaps-quote-styles ()
+  "Normal: toggle-quotes swaps single and double quote characters."
+  (let ((result (test-custom-ordering--with "say \"hi\" and 'bye'"
+                  (cj/toggle-quotes (point-min) (point-max)))))
+    (should (equal result "say 'hi' and \"bye\""))))
+
+;;; cj/reverse-lines
+
+(ert-deftest test-custom-ordering-reverse-lines-inverts-line-order ()
+  "Normal: reverse-lines flips top-to-bottom into bottom-to-top."
+  (let ((result (test-custom-ordering--with "one\ntwo\nthree"
+                  (cj/reverse-lines (point-min) (point-max)))))
+    (should (equal result "three\ntwo\none"))))
+
+;;; cj/number-lines
+
+(ert-deftest test-custom-ordering-number-lines-prefixes-with-format ()
+  "Normal: number-lines prefixes each line per the format string."
+  (let ((result (test-custom-ordering--with "alpha\nbeta\ngamma"
+                  (cj/number-lines (point-min) (point-max) "N. " nil))))
+    (should (equal result "1. alpha\n2. beta\n3. gamma"))))
+
+;;; cj/alphabetize-region
+
+(ert-deftest test-custom-ordering-alphabetize-sorts-words ()
+  "Normal: alphabetize-region sorts and joins with \", \"."
+  (let ((result
+         (with-temp-buffer
+           (insert "cherry apple banana")
+           (transient-mark-mode 1)
+           (set-mark (point-min))
+           (goto-char (point-max))
+           (activate-mark)
+           (cj/alphabetize-region)
+           (buffer-string))))
+    (should (equal result "apple, banana, cherry"))))
+
+(ert-deftest test-custom-ordering-alphabetize-without-region-errors ()
+  "Error: alphabetize-region without an active region signals."
+  (with-temp-buffer
+    (insert "anything")
+    (deactivate-mark)
+    (should-error (cj/alphabetize-region) :type 'user-error)))
+
+;;; cj/comma-separated-text-to-lines
+
+(ert-deftest test-custom-ordering-comma-to-lines-replaces-region ()
+  "Normal: comma-separated-text-to-lines splits commas into newlines."
+  (let ((result
+         (with-temp-buffer
+           (insert "a,b,c")
+           (transient-mark-mode 1)
+           (set-mark (point-min))
+           (goto-char (point-max))
+           (activate-mark)
+           (cj/comma-separated-text-to-lines)
+           (buffer-string))))
+    (should (equal result "a\nb\nc"))))
+
+(ert-deftest test-custom-ordering-comma-to-lines-without-region-errors ()
+  "Error: comma-separated-text-to-lines without a region signals."
+  (with-temp-buffer
+    (insert "a,b,c")
+    (deactivate-mark)
+    (should-error (cj/comma-separated-text-to-lines))))
+
+(provide 'test-custom-ordering-wrappers)
+;;; test-custom-ordering-wrappers.el ends here