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;;; test-custom-misc-cj--count-characters.el --- Tests for cj/--count-characters -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/--count-characters internal implementation function from custom-misc.el
;;
;; This internal function counts characters between START and END positions.
;; It validates that START is not greater than END and returns the character count.
;;; 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-setup ()
"Set up test environment."
;; No setup needed for this function
nil)
(defun test-count-characters-teardown ()
"Clean up test environment."
;; No teardown needed for this function
nil)
;;; Normal Cases
(ert-deftest test-custom-misc-cj--count-characters-normal-simple-text-returns-count ()
"Should count characters in simple text region."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
(let ((result (cj/--count-characters 1 14)))
(should (= result 13))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-normal-partial-region-returns-count ()
"Should count characters in partial region."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
(let ((result (cj/--count-characters 1 6)))
(should (= result 5))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-normal-multiline-returns-count ()
"Should count characters including newlines."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Line 1\nLine 2\nLine 3")
;; 6 + 1 + 6 + 1 + 6 = 20 characters
(let ((result (cj/--count-characters (point-min) (point-max))))
(should (= result 20))))
(test-count-characters-teardown)))
;;; Boundary Cases
(ert-deftest test-custom-misc-cj--count-characters-boundary-empty-region-returns-zero ()
"Should return 0 for empty region (start equals end)."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello")
(let ((result (cj/--count-characters 3 3)))
(should (= result 0))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-single-character-returns-one ()
"Should return 1 for single character region."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello")
(let ((result (cj/--count-characters 1 2)))
(should (= result 1))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-large-region-returns-count ()
"Should handle very large region."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(let ((large-content (make-string 100000 ?x)))
(insert large-content)
(let ((result (cj/--count-characters (point-min) (point-max))))
(should (= result 100000)))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-unicode-returns-count ()
"Should count unicode characters (emoji, RTL text, combining characters)."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
;; "Hello 👋 مرحبا" contains emoji and Arabic text
(insert "Hello 👋 مرحبا")
(let ((result (cj/--count-characters (point-min) (point-max))))
;; Count the actual characters in the buffer
(should (= result (- (point-max) (point-min))))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-whitespace-only-returns-count ()
"Should count whitespace characters."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert " \t\n ")
;; 3 spaces + 1 tab + 1 newline + 2 spaces = 7 characters
(let ((result (cj/--count-characters (point-min) (point-max))))
(should (= result 7))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-newlines-at-boundaries-returns-count ()
"Should count newlines at start and end."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "\n\nHello\n\n")
;; 2 newlines + 5 chars + 2 newlines = 9 characters
(let ((result (cj/--count-characters (point-min) (point-max))))
(should (= result 9))))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-boundary-binary-content-returns-count ()
"Should handle binary content."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert (string 0 1 2 255))
(let ((result (cj/--count-characters (point-min) (point-max))))
(should (= result 4))))
(test-count-characters-teardown)))
;;; Error Cases
(ert-deftest test-custom-misc-cj--count-characters-error-start-greater-than-end-signals-error ()
"Should signal error when start is greater than end."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello, world!")
(should-error (cj/--count-characters 10 5)
:type 'error))
(test-count-characters-teardown)))
(ert-deftest test-custom-misc-cj--count-characters-error-positions-out-of-bounds-handled ()
"Should handle positions beyond buffer bounds (Emacs handles this)."
(test-count-characters-setup)
(unwind-protect
(with-temp-buffer
(insert "Hello")
;; Emacs will error if positions are truly out of bounds,
;; but this tests that our function doesn't add additional errors
;; Buffer has 6 positions (1-6), testing valid bounds
(let ((result (cj/--count-characters 1 6)))
(should (= result 5))))
(test-count-characters-teardown)))
(provide 'test-custom-misc-cj--count-characters)
;;; test-custom-misc-cj--count-characters.el ends here
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