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;;; test-custom-buffer-file-copy-to-top-of-buffer.el --- Tests for cj/copy-to-top-of-buffer -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/copy-to-top-of-buffer function from custom-buffer-file.el
;;
;; This function copies all text from the beginning of the buffer to point
;; 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-top-setup ()
"Set up test environment."
(setq kill-ring nil))
(defun test-copy-to-top-teardown ()
"Clean up test environment."
(setq kill-ring nil))
;;; Normal Cases
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-normal-point-in-middle-copies-from-beginning ()
"Should copy from beginning to point when point in middle."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
(goto-char (point-min))
(forward-line 2) ; Point at start of "Line 3"
(let ((original-content (buffer-string)))
(cj/copy-to-top-of-buffer)
;; Buffer should be unchanged
(should (equal (buffer-string) original-content))
;; Kill ring should contain from beginning to point
(should (equal (car kill-ring) "Line 1\nLine 2\n"))))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-normal-single-line-copies-partial ()
"Should copy partial line content from beginning to middle of line."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello World")
(goto-char (point-min))
(forward-char 5) ; Point after "Hello"
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "Hello World"))
(should (equal (car kill-ring) "Hello")))
(test-copy-to-top-teardown)))
;;; Boundary Cases
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-point-at-end-copies-all ()
"Should copy entire buffer when point at end."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
(goto-char (point-max))
(cj/copy-to-top-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-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-point-at-beginning-copies-empty ()
"Should copy empty string when point at beginning."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
(goto-char (point-min))
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "Line 1\nLine 2\nLine 3"))
(should (equal (car kill-ring) "")))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-empty-buffer-copies-empty ()
"Should copy empty string in empty buffer."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) ""))
(should (equal (car kill-ring) "")))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-point-at-second-char-copies-one ()
"Should copy first character when point at second character."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello")
(goto-char (1+ (point-min))) ; After 'H'
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "Hello"))
(should (equal (car kill-ring) "H")))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-unicode-content-copies-correctly ()
"Should handle unicode content correctly."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello 👋\nمرحبا\nWorld")
(goto-char (point-min))
(forward-line 2) ; Point at start of "World"
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "Hello 👋\nمرحبا\nWorld"))
(should (equal (car kill-ring) "Hello 👋\nمرحبا\n")))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-narrowed-buffer-respects-narrowing ()
"Should respect narrowing and only copy within narrowed region."
(test-copy-to-top-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-max)) ; Point at end of narrowed region
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "Line 2\nLine 3\n"))
(should (equal (car kill-ring) "Line 2\nLine 3\n"))))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-whitespace-only-copies-whitespace ()
"Should copy whitespace-only content."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert " \n\t\t\n ")
(goto-char (point-min))
(forward-char 7) ; After second newline
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) " \n\t\t\n "))
(should (equal (car kill-ring) " \n\t\t\n")))
(test-copy-to-top-teardown)))
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-boundary-single-character-copies-char ()
"Should copy single character buffer."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "x")
(goto-char (point-max))
(cj/copy-to-top-of-buffer)
(should (equal (buffer-string) "x"))
(should (equal (car kill-ring) "x")))
(test-copy-to-top-teardown)))
;;; Error Cases
(ert-deftest test-custom-buffer-file-copy-to-top-of-buffer-error-read-only-buffer-succeeds ()
"Should work in read-only buffer since it doesn't modify content."
(test-copy-to-top-setup)
(unwind-protect
(with-temp-buffer
(insert "Read-only content")
(goto-char (point-max))
(read-only-mode 1)
(cj/copy-to-top-of-buffer)
(should (equal (car kill-ring) "Read-only content")))
(test-copy-to-top-teardown)))
(provide 'test-custom-buffer-file-copy-to-top-of-buffer)
;;; test-custom-buffer-file-copy-to-top-of-buffer.el ends here
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