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+;;; test-custom-buffer-file-copy-to-bottom-of-buffer.el --- Tests for cj/copy-to-bottom-of-buffer -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for the cj/copy-to-bottom-of-buffer function from custom-buffer-file.el
+;;
+;; This function copies all text from point to the end of the current buffer
+;; to the kill ring without modifying the buffer.
+
+;;; 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 ps-print package
+(provide 'ps-print)
+
+;; Now load the actual production module
+(require 'custom-buffer-file)
+
+;;; Setup and Teardown
+
+(defun test-copy-to-bottom-setup ()
+  "Set up test environment."
+  (setq kill-ring nil))
+
+(defun test-copy-to-bottom-teardown ()
+  "Clean up test environment."
+  (setq kill-ring nil))
+
+;;; Normal Cases
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-normal-point-in-middle-copies-to-end ()
+  "Should copy from point to end when point in middle."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Line 1\nLine 2\nLine 3")
+        (goto-char (point-min))
+        (forward-line 1)  ; Point at start of "Line 2"
+        (let ((original-content (buffer-string)))
+          (cj/copy-to-bottom-of-buffer)
+          ;; Buffer should be unchanged
+          (should (equal (buffer-string) original-content))
+          ;; Kill ring should contain from point to end
+          (should (equal (car kill-ring) "Line 2\nLine 3"))))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-normal-single-line-copies-partial ()
+  "Should copy partial line content from middle of line."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Hello World")
+        (goto-char (point-min))
+        (forward-char 6)  ; Point after "Hello "
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "Hello World"))
+        (should (equal (car kill-ring) "World")))
+    (test-copy-to-bottom-teardown)))
+
+;;; Boundary Cases
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-point-at-beginning-copies-all ()
+  "Should copy entire buffer when point at beginning."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Line 1\nLine 2\nLine 3")
+        (goto-char (point-min))
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "Line 1\nLine 2\nLine 3"))
+        (should (equal (car kill-ring) "Line 1\nLine 2\nLine 3")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-point-at-end-copies-empty ()
+  "Should copy empty string when point at end."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Line 1\nLine 2\nLine 3")
+        (goto-char (point-max))
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "Line 1\nLine 2\nLine 3"))
+        (should (equal (car kill-ring) "")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-empty-buffer-copies-empty ()
+  "Should copy empty string in empty buffer."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) ""))
+        (should (equal (car kill-ring) "")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-point-second-to-last-char-copies-one ()
+  "Should copy last character when point at second-to-last."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Hello")
+        (goto-char (1- (point-max)))  ; Before 'o'
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "Hello"))
+        (should (equal (car kill-ring) "o")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-unicode-content-copies-correctly ()
+  "Should handle unicode content correctly."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Hello 👋\nمرحبا\nWorld")
+        (goto-char (point-min))
+        (forward-line 1)
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "Hello 👋\nمرحبا\nWorld"))
+        (should (equal (car kill-ring) "مرحبا\nWorld")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-narrowed-buffer-respects-narrowing ()
+  "Should respect narrowing and only copy within narrowed region."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Line 1\nLine 2\nLine 3\nLine 4")
+        (goto-char (point-min))
+        (forward-line 1)
+        (let ((start (point)))
+          (forward-line 2)
+          (narrow-to-region start (point))
+          (goto-char (point-min))
+          (forward-line 1)  ; Point at "Line 3"
+          (cj/copy-to-bottom-of-buffer)
+          (should (equal (buffer-string) "Line 2\nLine 3\n"))
+          (should (equal (car kill-ring) "Line 3\n"))))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-whitespace-only-copies-whitespace ()
+  "Should copy whitespace-only content."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "   \n\t\t\n  ")
+        (goto-char (point-min))
+        (forward-char 4)  ; After first newline
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "   \n\t\t\n  "))
+        (should (equal (car kill-ring) "\t\t\n  ")))
+    (test-copy-to-bottom-teardown)))
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-boundary-single-character-copies-char ()
+  "Should copy single character buffer."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "x")
+        (goto-char (point-min))
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (buffer-string) "x"))
+        (should (equal (car kill-ring) "x")))
+    (test-copy-to-bottom-teardown)))
+
+;;; Error Cases
+
+(ert-deftest test-custom-buffer-file-copy-to-bottom-of-buffer-error-read-only-buffer-succeeds ()
+  "Should work in read-only buffer since it doesn't modify content."
+  (test-copy-to-bottom-setup)
+  (unwind-protect
+      (with-temp-buffer
+        (insert "Read-only content")
+        (read-only-mode 1)
+        (goto-char (point-min))
+        (cj/copy-to-bottom-of-buffer)
+        (should (equal (car kill-ring) "Read-only content")))
+    (test-copy-to-bottom-teardown)))
+
+(provide 'test-custom-buffer-file-copy-to-bottom-of-buffer)
+;;; test-custom-buffer-file-copy-to-bottom-of-buffer.el ends here