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;;; test-custom-text-enclose-append.el --- Tests for cj/--append-to-lines -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/--append-to-lines function from custom-text-enclose.el
;;
;; This function appends a suffix string to the end of each line in text.
;; It preserves the structure of lines and handles trailing newlines correctly.
;;
;; Examples:
;; Input: "line1\nline2", suffix: ";"
;; Output: "line1;\nline2;"
;;
;; Input: "single", suffix: "!"
;; Output: "single!"
;;
;; We test the NON-INTERACTIVE implementation (cj/--append-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-append-to-lines (text suffix)
"Test cj/--append-to-lines on TEXT with SUFFIX.
Returns the transformed string."
(cj/--append-to-lines text suffix))
;;; Normal Cases - Single Line
(ert-deftest test-append-single-line ()
"Should append to single line."
(let ((result (test-append-to-lines "hello" ";")))
(should (string= result "hello;"))))
(ert-deftest test-append-single-line-semicolon ()
"Should append semicolon to single line."
(let ((result (test-append-to-lines "var x = 5" ";")))
(should (string= result "var x = 5;"))))
(ert-deftest test-append-single-line-exclamation ()
"Should append exclamation mark to single line."
(let ((result (test-append-to-lines "Hello world" "!")))
(should (string= result "Hello world!"))))
;;; Normal Cases - Multiple Lines
(ert-deftest test-append-two-lines ()
"Should append to two lines."
(let ((result (test-append-to-lines "line1\nline2" ";")))
(should (string= result "line1;\nline2;"))))
(ert-deftest test-append-three-lines ()
"Should append to three lines."
(let ((result (test-append-to-lines "a\nb\nc" ".")))
(should (string= result "a.\nb.\nc."))))
(ert-deftest test-append-many-lines ()
"Should append to many lines."
(let* ((lines (make-list 10 "line"))
(input (mapconcat #'identity lines "\n"))
(result (test-append-to-lines input ";"))
(result-lines (split-string result "\n")))
(should (= 10 (length result-lines)))
(should (cl-every (lambda (line) (string-suffix-p ";" line)) result-lines))))
;;; Normal Cases - Various Suffixes
(ert-deftest test-append-comma ()
"Should append comma to lines."
(let ((result (test-append-to-lines "apple\nbanana" ",")))
(should (string= result "apple,\nbanana,"))))
(ert-deftest test-append-multi-char ()
"Should append multi-character suffix."
(let ((result (test-append-to-lines "line" " // comment")))
(should (string= result "line // comment"))))
(ert-deftest test-append-pipe ()
"Should append pipe character."
(let ((result (test-append-to-lines "col1\ncol2" " |")))
(should (string= result "col1 |\ncol2 |"))))
(ert-deftest test-append-empty-suffix ()
"Should handle empty suffix."
(let ((result (test-append-to-lines "line1\nline2" "")))
(should (string= result "line1\nline2"))))
;;; Boundary Cases - Trailing Newlines
(ert-deftest test-append-with-trailing-newline ()
"Should preserve trailing newline."
(let ((result (test-append-to-lines "line1\nline2\n" ";")))
(should (string= result "line1;\nline2;\n"))))
(ert-deftest test-append-no-trailing-newline ()
"Should work without trailing newline."
(let ((result (test-append-to-lines "line1\nline2" ";")))
(should (string= result "line1;\nline2;"))))
(ert-deftest test-append-single-line-with-newline ()
"Should preserve trailing newline on single line."
(let ((result (test-append-to-lines "line\n" ";")))
(should (string= result "line;\n"))))
;;; Boundary Cases - Empty Lines
(ert-deftest test-append-empty-line-between ()
"Should append to empty line between other lines."
(let ((result (test-append-to-lines "line1\n\nline3" ";")))
(should (string= result "line1;\n;\nline3;"))))
(ert-deftest test-append-only-empty-lines ()
"Should append to only empty lines."
(let ((result (test-append-to-lines "\n\n" ";")))
(should (string= result ";\n;\n"))))
(ert-deftest test-append-empty-first-line ()
"Should append to empty first line."
(let ((result (test-append-to-lines "\nline2\nline3" ";")))
(should (string= result ";\nline2;\nline3;"))))
;;; Boundary Cases - Whitespace
(ert-deftest test-append-preserves-leading-whitespace ()
"Should preserve leading whitespace."
(let ((result (test-append-to-lines " line1\n line2" ";")))
(should (string= result " line1;\n line2;"))))
(ert-deftest test-append-preserves-trailing-whitespace ()
"Should preserve trailing whitespace on line."
(let ((result (test-append-to-lines "line1 \nline2 " ";")))
(should (string= result "line1 ;\nline2 ;"))))
(ert-deftest test-append-whitespace-only-line ()
"Should append to whitespace-only line."
(let ((result (test-append-to-lines "line1\n \nline3" ";")))
(should (string= result "line1;\n ;\nline3;"))))
;;; Boundary Cases - Special Cases
(ert-deftest test-append-empty-string ()
"Should handle empty string."
(let ((result (test-append-to-lines "" ";")))
(should (string= result ";"))))
(ert-deftest test-append-very-long-line ()
"Should append to very long line."
(let* ((long-line (make-string 1000 ?a))
(result (test-append-to-lines long-line ";")))
(should (string-suffix-p ";" result))
(should (= (length result) 1001))))
(ert-deftest test-append-with-existing-suffix ()
"Should append even if line already has the suffix."
(let ((result (test-append-to-lines "line;" ";")))
(should (string= result "line;;"))))
;;; Edge Cases - Special Characters in Suffix
(ert-deftest test-append-newline-suffix ()
"Should append newline as suffix."
(let ((result (test-append-to-lines "line1\nline2" "\n")))
(should (string= result "line1\n\nline2\n"))))
(ert-deftest test-append-tab-suffix ()
"Should append tab as suffix."
(let ((result (test-append-to-lines "col1\ncol2" "\t")))
(should (string= result "col1\t\ncol2\t"))))
(ert-deftest test-append-quote-suffix ()
"Should append quote as suffix."
(let ((result (test-append-to-lines "value1\nvalue2" "\"")))
(should (string= result "value1\"\nvalue2\""))))
(provide 'test-custom-text-enclose-append)
;;; test-custom-text-enclose-append.el ends here
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