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;;; test-custom-text-enclose-prepend.el --- Tests for cj/--prepend-to-lines -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/--prepend-to-lines function from custom-text-enclose.el
;;
;; This function prepends a prefix string to the beginning of each line in text.
;; It preserves the structure of lines and handles trailing newlines correctly.
;;
;; Examples:
;; Input: "line1\nline2", prefix: "// "
;; Output: "// line1\n// line2"
;;
;; Input: "single", prefix: "> "
;; Output: "> single"
;;
;; We test the NON-INTERACTIVE implementation (cj/--prepend-to-lines) 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-text-enclose)
;;; Test Helpers
(defun test-prepend-to-lines (text prefix)
"Test cj/--prepend-to-lines on TEXT with PREFIX.
Returns the transformed string."
(cj/--prepend-to-lines text prefix))
;;; Normal Cases - Single Line
(ert-deftest test-prepend-single-line ()
"Should prepend to single line."
(let ((result (test-prepend-to-lines "hello" "> ")))
(should (string= result "> hello"))))
(ert-deftest test-prepend-single-line-comment ()
"Should prepend comment marker to single line."
(let ((result (test-prepend-to-lines "code here" "// ")))
(should (string= result "// code here"))))
(ert-deftest test-prepend-single-line-bullet ()
"Should prepend bullet to single line."
(let ((result (test-prepend-to-lines "item" "- ")))
(should (string= result "- item"))))
;;; Normal Cases - Multiple Lines
(ert-deftest test-prepend-two-lines ()
"Should prepend to two lines."
(let ((result (test-prepend-to-lines "line1\nline2" "> ")))
(should (string= result "> line1\n> line2"))))
(ert-deftest test-prepend-three-lines ()
"Should prepend to three lines."
(let ((result (test-prepend-to-lines "a\nb\nc" "* ")))
(should (string= result "* a\n* b\n* c"))))
(ert-deftest test-prepend-many-lines ()
"Should prepend to many lines."
(let* ((lines (make-list 10 "line"))
(input (mapconcat #'identity lines "\n"))
(result (test-prepend-to-lines input "# "))
(result-lines (split-string result "\n")))
(should (= 10 (length result-lines)))
(should (cl-every (lambda (line) (string-prefix-p "# " line)) result-lines))))
;;; Normal Cases - Various Prefixes
(ert-deftest test-prepend-comment-marker ()
"Should prepend comment marker."
(let ((result (test-prepend-to-lines "line1\nline2" "// ")))
(should (string= result "// line1\n// line2"))))
(ert-deftest test-prepend-hash-comment ()
"Should prepend hash comment."
(let ((result (test-prepend-to-lines "line1\nline2" "# ")))
(should (string= result "# line1\n# line2"))))
(ert-deftest test-prepend-multi-char ()
"Should prepend multi-character prefix."
(let ((result (test-prepend-to-lines "line" "TODO: ")))
(should (string= result "TODO: line"))))
(ert-deftest test-prepend-empty-prefix ()
"Should handle empty prefix."
(let ((result (test-prepend-to-lines "line1\nline2" "")))
(should (string= result "line1\nline2"))))
;;; Boundary Cases - Trailing Newlines
(ert-deftest test-prepend-with-trailing-newline ()
"Should preserve trailing newline."
(let ((result (test-prepend-to-lines "line1\nline2\n" "> ")))
(should (string= result "> line1\n> line2\n"))))
(ert-deftest test-prepend-no-trailing-newline ()
"Should work without trailing newline."
(let ((result (test-prepend-to-lines "line1\nline2" "> ")))
(should (string= result "> line1\n> line2"))))
(ert-deftest test-prepend-single-line-with-newline ()
"Should preserve trailing newline on single line."
(let ((result (test-prepend-to-lines "line\n" "> ")))
(should (string= result "> line\n"))))
;;; Boundary Cases - Empty Lines
(ert-deftest test-prepend-empty-line-between ()
"Should prepend to empty line between other lines."
(let ((result (test-prepend-to-lines "line1\n\nline3" "> ")))
(should (string= result "> line1\n> \n> line3"))))
(ert-deftest test-prepend-only-empty-lines ()
"Should prepend to only empty lines."
(let ((result (test-prepend-to-lines "\n\n" "> ")))
(should (string= result "> \n> \n"))))
(ert-deftest test-prepend-empty-first-line ()
"Should prepend to empty first line."
(let ((result (test-prepend-to-lines "\nline2\nline3" "> ")))
(should (string= result "> \n> line2\n> line3"))))
;;; Boundary Cases - Whitespace
(ert-deftest test-prepend-preserves-leading-whitespace ()
"Should preserve leading whitespace after prefix."
(let ((result (test-prepend-to-lines " line1\n line2" "// ")))
(should (string= result "// line1\n// line2"))))
(ert-deftest test-prepend-preserves-trailing-whitespace ()
"Should preserve trailing whitespace on line."
(let ((result (test-prepend-to-lines "line1 \nline2 " "> ")))
(should (string= result "> line1 \n> line2 "))))
(ert-deftest test-prepend-whitespace-only-line ()
"Should prepend to whitespace-only line."
(let ((result (test-prepend-to-lines "line1\n \nline3" "> ")))
(should (string= result "> line1\n> \n> line3"))))
;;; Boundary Cases - Special Cases
(ert-deftest test-prepend-empty-string ()
"Should handle empty string."
(let ((result (test-prepend-to-lines "" "> ")))
(should (string= result "> "))))
(ert-deftest test-prepend-very-long-line ()
"Should prepend to very long line."
(let* ((long-line (make-string 1000 ?a))
(result (test-prepend-to-lines long-line "> ")))
(should (string-prefix-p "> " result))
(should (= (length result) 1002))))
(ert-deftest test-prepend-with-existing-prefix ()
"Should prepend even if line already has the prefix."
(let ((result (test-prepend-to-lines "> line" "> ")))
(should (string= result "> > line"))))
;;; Edge Cases - Special Characters in Prefix
(ert-deftest test-prepend-newline-prefix ()
"Should prepend newline as prefix."
(let ((result (test-prepend-to-lines "line1\nline2" "\n")))
(should (string= result "\nline1\n\nline2"))))
(ert-deftest test-prepend-tab-prefix ()
"Should prepend tab as prefix."
(let ((result (test-prepend-to-lines "line1\nline2" "\t")))
(should (string= result "\tline1\n\tline2"))))
(ert-deftest test-prepend-quote-prefix ()
"Should prepend quote as prefix."
(let ((result (test-prepend-to-lines "line1\nline2" "\"")))
(should (string= result "\"line1\n\"line2"))))
;;; Edge Cases - Common Use Cases
(ert-deftest test-prepend-markdown-quote ()
"Should prepend markdown quote marker."
(let ((result (test-prepend-to-lines "quote text\nmore text" "> ")))
(should (string= result "> quote text\n> more text"))))
(ert-deftest test-prepend-numbered-list ()
"Should prepend numbers (though simpler uses would vary the prefix)."
(let ((result (test-prepend-to-lines "item" "1. ")))
(should (string= result "1. item"))))
(ert-deftest test-prepend-indentation ()
"Should prepend indentation spaces."
(let ((result (test-prepend-to-lines "code\nmore" " ")))
(should (string= result " code\n more"))))
(provide 'test-custom-text-enclose-prepend)
;;; test-custom-text-enclose-prepend.el ends here
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