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;;; test-custom-misc-cj-count-characters-buffer-or-region.el --- Tests for cj/count-characters-buffer-or-region -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/count-characters-buffer-or-region function from custom-misc.el
;;
;; This function counts characters in the active region or the entire buffer
;; if no region is active. It displays the count in the minibuffer.
;;; Code:
(require 'ert)
;; 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.")
;; Now load the actual production module
(require 'custom-misc)
;;; Setup and Teardown
(defun test-count-characters-buffer-or-region-setup ()
"Set up test environment."
;; No setup needed
nil)
(defun test-count-characters-buffer-or-region-teardown ()
"Clean up test environment."
;; Clear any active region
(when (use-region-p)
(deactivate-mark)))
;;; Normal Cases
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-normal-whole-buffer-counts-all ()
"Should count all characters in buffer when no region is active."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
;; Ensure no region is active
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p "13 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-normal-active-region-counts-region ()
"Should count characters in active region."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
;; Select "Hello" (positions 1-6)
(goto-char 1)
(push-mark 1)
(goto-char 6)
(activate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p "5 characters.*region" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-normal-multiline-buffer-counts-all ()
"Should count characters including newlines in buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
;; 6 + 1 + 6 + 1 + 6 = 20 characters
(should (string-match-p "20 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-normal-multiline-region-counts-region ()
"Should count characters including newlines in region."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
;; Select first two lines including newlines
(goto-char 1)
(push-mark 1)
(goto-char 14) ; After "Line 1\nLine 2"
(activate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
;; "Line 1\nLine 2" = 6 + 1 + 6 = 13 characters
(should (string-match-p "13 characters.*region" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
;;; Boundary Cases
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-empty-buffer-returns-zero ()
"Should return 0 for empty buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p "0 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-empty-region-counts-buffer ()
"Should count whole buffer when region is empty (point equals mark).
When mark and point are at the same position, use-region-p returns nil,
so the function correctly falls back to counting the entire buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
;; Create empty region (point equals mark)
;; Even with activate-mark, use-region-p returns nil when mark == point
(goto-char 5)
(push-mark 5)
(activate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
;; Should count the whole buffer (13 characters) not the empty region
(should (string-match-p "13 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-large-buffer-counts-all ()
"Should handle very large buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(let ((large-content (make-string 100000 ?x)))
(insert large-content)
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p "100000 characters.*buffer" message-output))))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-unicode-counts-correctly ()
"Should count unicode characters (emoji, RTL text) correctly."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello 👋 مرحبا")
(deactivate-mark)
(let ((message-output nil)
(expected-count (- (point-max) (point-min))))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p (format "%d characters.*buffer" expected-count)
message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-whitespace-only-counts-whitespace ()
"Should count whitespace characters."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert " \t\n ")
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
;; 3 spaces + 1 tab + 1 newline + 2 spaces = 7 characters
(should (string-match-p "7 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-single-character-returns-one ()
"Should return 1 for single character buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "x")
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
(should (string-match-p "1 character.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(ert-deftest test-custom-misc-cj-count-characters-buffer-or-region-boundary-narrowed-buffer-counts-visible ()
"Should count only visible characters in narrowed buffer."
(test-count-characters-buffer-or-region-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3\n")
(goto-char (point-min))
(forward-line 1)
(narrow-to-region (point) (progn (forward-line 1) (point)))
(deactivate-mark)
(let ((message-output nil))
(cl-letf (((symbol-function 'message)
(lambda (format-string &rest args)
(setq message-output (apply #'format format-string args)))))
(cj/count-characters-buffer-or-region)
;; "Line 2\n" = 7 characters
(should (string-match-p "7 characters.*buffer" message-output)))))
(test-count-characters-buffer-or-region-teardown)))
(provide 'test-custom-misc-cj-count-characters-buffer-or-region)
;;; test-custom-misc-cj-count-characters-buffer-or-region.el ends here
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