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diff --git a/tests/test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer.el b/tests/test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer.el
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index f3fe0fdd..00000000
--- a/tests/test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer.el
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-;;; test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer.el --- Tests for cj/remove-duplicate-lines-region-or-buffer -*- lexical-binding: t; -*-
-
-;;; Commentary:
-;; Tests for the cj/remove-duplicate-lines-region-or-buffer function from custom-line-paragraph.el
-;;
-;; This function removes duplicate lines in the region or buffer, keeping the first occurrence.
-;; Operates on the active region when one exists; otherwise operates on the whole buffer.
-;;
-;; The implementation uses a regex to find duplicate lines: "^\\(.*\\)\n\\(\\(.*\n\\)*\\)\\1\n"
-;; This pattern matches a line, then any number of lines in between, then the same line again.
-;;
-;; IMPORTANT NOTE ON REGION ACTIVATION IN BATCH MODE:
-;; When testing functions that use (use-region-p) in batch mode, you must
-;; explicitly activate the region. Unlike interactive Emacs, batch mode does
-;; not automatically activate regions when you set mark and point.
-
-;;; Code:
-
-(require 'ert)
-(require 'testutil-general)
-
-;; Add modules directory to load path
-(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
-
-;; Stub dependencies before loading the module
-(defvar cj/custom-keymap (make-sparse-keymap)
-  "Stub keymap for testing.")
-
-;; Stub expand-region package
-(provide 'expand-region)
-
-;; Now load the actual production module
-(require 'custom-line-paragraph)
-
-;;; Setup and Teardown
-
-(defun test-remove-duplicate-lines-setup ()
-  "Setup for remove-duplicate-lines tests."
-  (cj/create-test-base-dir))
-
-(defun test-remove-duplicate-lines-teardown ()
-  "Teardown for remove-duplicate-lines tests."
-  (cj/delete-test-base-dir))
-
-;;; Normal Cases
-
-(ert-deftest test-remove-duplicate-lines-adjacent-duplicates ()
-  "Should remove adjacent duplicate lines."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line one\nline one\nline two")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "line one\nline two" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-keep-first-occurrence ()
-  "Should keep first occurrence and remove subsequent duplicates."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "first\nsecond\nfirst\nthird")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "first\nsecond\nthird" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-multiple-sets ()
-  "Should remove multiple different duplicated lines."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "alpha\nbeta\nalpha\ngamma\nbeta\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "alpha\nbeta\ngamma\n" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-no-duplicates ()
-  "Should leave buffer unchanged when no duplicates exist."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line one\nline two\nline three")
-        (let ((original (buffer-string)))
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (should (string= original (buffer-string)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-region-only ()
-  "Should only affect active region, leaving rest of buffer unchanged."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "before\ndup\ndup\nafter")
-        (goto-char (point-min))
-        (forward-line 1)
-        (set-mark (point))
-        (forward-line 2)
-        (transient-mark-mode 1)
-        (activate-mark)
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; Should have removed one "dup" but kept before and after
-        (should (string-match-p "before" (buffer-string)))
-        (should (string-match-p "after" (buffer-string)))
-        (should (= 1 (how-many "^dup$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-whole-buffer ()
-  "Should operate on entire buffer when no region active."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "one\ntwo\none\nthree\ntwo\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "one\ntwo\nthree\n" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-preserve-unique ()
-  "Should preserve all unique lines intact."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "unique1\ndup\nunique2\ndup\nunique3")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string-match-p "unique1" (buffer-string)))
-        (should (string-match-p "unique2" (buffer-string)))
-        (should (string-match-p "unique3" (buffer-string)))
-        (should (= 1 (how-many "^dup$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-separated-by-content ()
-  "Should remove duplicate lines even when separated by other content."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "target\nother1\nother2\ntarget\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "^target$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-;;; Boundary Cases
-
-(ert-deftest test-remove-duplicate-lines-empty-buffer ()
-  "Should handle empty buffer gracefully."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-single-line ()
-  "Should handle single line buffer (no duplicates possible)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "only line")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "only line" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-two-identical-lines ()
-  "Should handle minimal duplicate case of two identical lines."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "same\nsame\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "same\n" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-all-identical ()
-  "Should keep only one line when all lines are identical."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "same\nsame\nsame\nsame\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "same\n" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-at-buffer-start ()
-  "Should handle duplicates at beginning of buffer."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "first\nfirst\nsecond\nthird")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "first\nsecond\nthird" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-at-buffer-end ()
-  "Should handle duplicates at end of buffer."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "first\nsecond\nlast\nlast\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "first\nsecond\nlast\n" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-empty-lines ()
-  "Should handle duplicate empty lines."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line1\n\n\nline2")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "line1\n\nline2" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-whitespace-only ()
-  "Should handle duplicate whitespace-only lines."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "   \n   \ntext")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (string= "   \ntext" (buffer-string))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-very-long ()
-  "Should handle very long duplicate lines (5000+ chars)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (let ((long-line (make-string 5000 ?x)))
-          (insert long-line "\n" long-line "\nshort")
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (should (= 1 (how-many (regexp-quote long-line) (point-min) (point-max))))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-unicode-emoji ()
-  "Should handle Unicode and emoji duplicates."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "hello 👋\nhello 👋\nother")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "hello 👋" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-with-tabs ()
-  "Should preserve and match tab characters."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line\twith\ttabs\nline\twith\ttabs\nother")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "line\twith\ttabs" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-mixed-whitespace ()
-  "Should do exact whitespace matching."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "  line \t text  \n  line \t text  \nother")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "  line \t text  " (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-rtl-text ()
-  "Should handle RTL text duplicates."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "مرحبا\nمرحبا\nعالم")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "مرحبا" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-case-insensitive ()
-  "Should treat different cases as same line (case-insensitive by default)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "Line\nline\nLINE\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; Case-insensitive matching, so duplicates removed
-        (should (= 1 (how-many "^[Ll][Ii][Nn][Ee]$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-trailing-whitespace-matters ()
-  "Should treat trailing whitespace as significant."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line \nline\nline \n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; "line " appears twice, one should be removed
-        (should (= 1 (how-many "line $" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-leading-whitespace-matters ()
-  "Should treat leading whitespace as significant."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert " line\nline\n line\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; " line" appears twice, one should be removed
-        (should (= 1 (how-many "^ line$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-narrowed-buffer ()
-  "Should respect buffer narrowing."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "before\ndup\ndup\nafter")
-        (goto-char (point-min))
-        (forward-line 1)
-        (let ((beg (point)))
-          (forward-line 2)
-          (narrow-to-region beg (point))
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (widen)
-          ;; Should still have before and after
-          (should (string-match-p "before" (buffer-string)))
-          (should (string-match-p "after" (buffer-string)))
-          ;; Should have removed one dup
-          (should (= 1 (how-many "^dup$" (point-min) (point-max))))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-backwards-region ()
-  "Should handle backwards region (mark after point)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "dup\ndup\nother")
-        (goto-char (point-max))
-        (set-mark (point))
-        (goto-char (point-min))
-        (transient-mark-mode 1)
-        (activate-mark)
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "^dup$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-entire-buffer-as-region ()
-  "Should handle entire buffer selected as region."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "one\ntwo\none\nthree")
-        (transient-mark-mode 1)
-        (mark-whole-buffer)
-        (activate-mark)
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "^one$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-region-no-duplicates ()
-  "Should leave region unchanged when no duplicates exist."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "before\nunique1\nunique2\nafter")
-        (goto-char (point-min))
-        (forward-line 1)
-        (set-mark (point))
-        (forward-line 2)
-        (transient-mark-mode 1)
-        (activate-mark)
-        (let ((original (buffer-string)))
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (should (string= original (buffer-string)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-three-or-more ()
-  "Should keep first and remove all other duplicates."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "dup\nother1\ndup\nother2\ndup\nother3\ndup\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (= 1 (how-many "^dup$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-alternating-pattern ()
-  "Should handle alternating duplicate pattern (A B A B)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "A\nB\nA\nB\n")
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; Should keep first A and first B, remove duplicates
-        (should (= 1 (how-many "^A$" (point-min) (point-max))))
-        (should (= 1 (how-many "^B$" (point-min) (point-max)))))
-    (test-remove-duplicate-lines-teardown)))
-
-;;; Error Cases
-
-(ert-deftest test-remove-duplicate-lines-read-only-buffer ()
-  "Should error when attempting to modify read-only buffer."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "dup\ndup\n")
-        (read-only-mode 1)
-        (should-error (cj/remove-duplicate-lines-region-or-buffer)))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-buffer-modified-flag ()
-  "Should set buffer modified flag when duplicates removed."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "dup\ndup\n")
-        (set-buffer-modified-p nil)
-        (cj/remove-duplicate-lines-region-or-buffer)
-        (should (buffer-modified-p)))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-undo-behavior ()
-  "Should support undo after removing duplicates."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (let* ((temp-file (expand-file-name "test-undo-rmdup.txt" cj/test-base-dir))
-             (original-content "dup\ndup\nother"))
-        ;; Create file with initial content
-        (with-temp-file temp-file
-          (insert original-content))
-        ;; Open file and test undo
-        (find-file temp-file)
-        (buffer-enable-undo)
-        ;; Establish undo history
-        (goto-char (point-min))
-        (insert " ")
-        (delete-char -1)
-        (undo-boundary)
-        (let ((before-remove (buffer-string)))
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (undo-boundary)
-          (let ((after-remove (buffer-string)))
-            (should-not (string= before-remove after-remove))
-            (undo)
-            (should (string= before-remove (buffer-string)))))
-        (kill-buffer (current-buffer)))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-cursor-position-preserved ()
-  "Should preserve cursor position (save-excursion)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "line1\ndup\nline2\ndup\nline3")
-        (goto-char (point-min))
-        (forward-char 3)  ; Position in middle of first line
-        (let ((original-pos (point)))
-          (cj/remove-duplicate-lines-region-or-buffer)
-          (should (= (point) original-pos))))
-    (test-remove-duplicate-lines-teardown)))
-
-(ert-deftest test-remove-duplicate-lines-region-preserved ()
-  "Should preserve region state (save-excursion maintains mark)."
-  (test-remove-duplicate-lines-setup)
-  (unwind-protect
-      (with-temp-buffer
-        (insert "dup\ndup\nother\n")
-        (transient-mark-mode 1)
-        (mark-whole-buffer)
-        (activate-mark)
-        (should (use-region-p))
-        (cj/remove-duplicate-lines-region-or-buffer)
-        ;; save-excursion preserves mark, so region stays active
-        (should (use-region-p)))
-    (test-remove-duplicate-lines-teardown)))
-
-(provide 'test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer)
-;;; test-custom-line-paragraph-remove-duplicate-lines-region-or-buffer.el ends here