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;;; test-custom-whitespace-hyphenate.el --- Tests for cj/--hyphenate-whitespace -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/--hyphenate-whitespace function from custom-whitespace.el
;;
;; This function replaces all runs of whitespace (spaces, tabs, newlines,
;; carriage returns) with single hyphens. Useful for converting text with
;; whitespace into hyphenated identifiers or URLs.
;;
;; Uses the regexp [ \t\n\r]+ to match whitespace runs.
;;
;; We test the NON-INTERACTIVE implementation (cj/--hyphenate-whitespace)
;; to avoid mocking region selection. This follows our testing best practice
;; of separating business logic from UI interaction.
;;; 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.")
;; Now load the actual production module
(require 'custom-whitespace)
;;; Test Helpers
(defun test-hyphenate-whitespace (input-text)
"Test cj/--hyphenate-whitespace on INPUT-TEXT.
Returns the buffer string after operation."
(with-temp-buffer
(insert input-text)
(cj/--hyphenate-whitespace (point-min) (point-max))
(buffer-string)))
;;; Normal Cases
(ert-deftest test-hyphenate-whitespace-single-space ()
"Should replace single space with hyphen."
(let ((result (test-hyphenate-whitespace "hello world")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-multiple-spaces ()
"Should replace multiple spaces with single hyphen."
(let ((result (test-hyphenate-whitespace "hello world")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-tabs ()
"Should replace tabs with hyphen."
(let ((result (test-hyphenate-whitespace "hello\tworld")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-mixed-tabs-spaces ()
"Should replace mixed tabs and spaces with single hyphen."
(let ((result (test-hyphenate-whitespace "hello \t world")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-newlines ()
"Should replace newlines with hyphen (joining lines)."
(let ((result (test-hyphenate-whitespace "hello\nworld")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-multiple-newlines ()
"Should replace multiple newlines with single hyphen."
(let ((result (test-hyphenate-whitespace "hello\n\n\nworld")))
(should (string= result "hello-world"))))
(ert-deftest test-hyphenate-whitespace-multiple-words ()
"Should hyphenate multiple words with various whitespace."
(let ((result (test-hyphenate-whitespace "one two three\tfour\nfive")))
(should (string= result "one-two-three-four-five"))))
(ert-deftest test-hyphenate-whitespace-carriage-returns ()
"Should handle carriage returns."
(let ((result (test-hyphenate-whitespace "hello\r\nworld")))
(should (string= result "hello-world"))))
;;; Boundary Cases
(ert-deftest test-hyphenate-whitespace-empty-string ()
"Should handle empty string."
(let ((result (test-hyphenate-whitespace "")))
(should (string= result ""))))
(ert-deftest test-hyphenate-whitespace-no-whitespace ()
"Should handle text with no whitespace (no-op)."
(let ((result (test-hyphenate-whitespace "helloworld")))
(should (string= result "helloworld"))))
(ert-deftest test-hyphenate-whitespace-only-whitespace ()
"Should convert text with only whitespace to single hyphen."
(let ((result (test-hyphenate-whitespace " \t \n ")))
(should (string= result "-"))))
(ert-deftest test-hyphenate-whitespace-single-char ()
"Should handle single character with surrounding spaces."
(let ((result (test-hyphenate-whitespace " x ")))
(should (string= result "-x-"))))
(ert-deftest test-hyphenate-whitespace-very-long-text ()
"Should handle very long text with many spaces."
(let ((result (test-hyphenate-whitespace "word word word word word word word word")))
(should (string= result "word-word-word-word-word-word-word-word"))))
(ert-deftest test-hyphenate-whitespace-leading-whitespace ()
"Should replace leading whitespace with hyphen."
(let ((result (test-hyphenate-whitespace " hello world")))
(should (string= result "-hello-world"))))
(ert-deftest test-hyphenate-whitespace-trailing-whitespace ()
"Should replace trailing whitespace with hyphen."
(let ((result (test-hyphenate-whitespace "hello world ")))
(should (string= result "hello-world-"))))
;;; Error Cases
(ert-deftest test-hyphenate-whitespace-start-greater-than-end ()
"Should error when start > end."
(should-error
(with-temp-buffer
(insert "hello world")
(cj/--hyphenate-whitespace (point-max) (point-min)))
:type 'error))
(ert-deftest test-hyphenate-whitespace-empty-region ()
"Should handle empty region (start == end) without error."
(with-temp-buffer
(insert "hello world")
(let ((pos (/ (+ (point-min) (point-max)) 2)))
(cj/--hyphenate-whitespace pos pos)
;; Should complete without error and not change buffer
(should (string= (buffer-string) "hello world")))))
(provide 'test-custom-whitespace-hyphenate)
;;; test-custom-whitespace-hyphenate.el ends here
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