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;;; test-custom-whitespace-collapse.el --- Tests for cj/--collapse-whitespace -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the cj/--collapse-whitespace function from custom-whitespace.el
;;
;; This function collapses whitespace in text by:
;; - Converting all tabs to spaces
;; - Removing leading and trailing whitespace
;; - Collapsing multiple consecutive spaces to single space
;; - Preserving newlines and text structure
;;
;; We test the NON-INTERACTIVE implementation (cj/--collapse-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-collapse-whitespace (input-text)
"Test cj/--collapse-whitespace on INPUT-TEXT.
Returns the buffer string after operation."
(with-temp-buffer
(insert input-text)
(cj/--collapse-whitespace (point-min) (point-max))
(buffer-string)))
;;; Normal Cases
(ert-deftest test-collapse-whitespace-multiple-spaces ()
"Should collapse multiple spaces to single space."
(let ((result (test-collapse-whitespace "hello world")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-multiple-tabs ()
"Should convert tabs to spaces and collapse."
(let ((result (test-collapse-whitespace "hello\t\t\tworld")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-mixed-tabs-spaces ()
"Should handle mixed tabs and spaces."
(let ((result (test-collapse-whitespace "hello \t \t world")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-leading-trailing ()
"Should remove leading and trailing whitespace."
(let ((result (test-collapse-whitespace " hello world ")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-tabs-leading-trailing ()
"Should remove leading and trailing tabs."
(let ((result (test-collapse-whitespace "\t\thello world\t\t")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-multiple-words ()
"Should collapse spaces between multiple words."
(let ((result (test-collapse-whitespace "one two three four")))
(should (string= result "one two three four"))))
(ert-deftest test-collapse-whitespace-preserve-newlines ()
"Should preserve newlines while collapsing spaces."
(let ((result (test-collapse-whitespace "hello world\nfoo bar")))
(should (string= result "hello world\nfoo bar"))))
(ert-deftest test-collapse-whitespace-multiple-lines ()
"Should handle multiple lines with various whitespace."
(let ((result (test-collapse-whitespace " hello world \n\t\tfoo bar\t\t")))
(should (string= result "hello world\nfoo bar"))))
;;; Boundary Cases
(ert-deftest test-collapse-whitespace-empty-string ()
"Should handle empty string."
(let ((result (test-collapse-whitespace "")))
(should (string= result ""))))
(ert-deftest test-collapse-whitespace-single-char ()
"Should handle single character with surrounding spaces."
(let ((result (test-collapse-whitespace " x ")))
(should (string= result "x"))))
(ert-deftest test-collapse-whitespace-only-whitespace ()
"Should handle text with only whitespace (becomes empty)."
(let ((result (test-collapse-whitespace " \t \t ")))
(should (string= result ""))))
(ert-deftest test-collapse-whitespace-no-extra-whitespace ()
"Should handle text with no extra whitespace (no-op)."
(let ((result (test-collapse-whitespace "hello world")))
(should (string= result "hello world"))))
(ert-deftest test-collapse-whitespace-single-space ()
"Should handle text with already-collapsed spaces (no-op)."
(let ((result (test-collapse-whitespace "one two three")))
(should (string= result "one two three"))))
(ert-deftest test-collapse-whitespace-very-long-line ()
"Should handle very long lines with many spaces."
(let ((result (test-collapse-whitespace "word word word word word")))
(should (string= result "word word word word word"))))
(ert-deftest test-collapse-whitespace-multiple-newlines ()
"Should preserve multiple newlines while removing spaces."
(let ((result (test-collapse-whitespace "hello world\n\n\nfoo bar")))
(should (string= result "hello world\n\n\nfoo bar"))))
(ert-deftest test-collapse-whitespace-spaces-around-newlines ()
"Should remove spaces before/after newlines."
(let ((result (test-collapse-whitespace "hello \n world")))
(should (string= result "hello\nworld"))))
(ert-deftest test-collapse-whitespace-empty-lines ()
"Should handle empty lines (lines become empty after whitespace removal)."
(let ((result (test-collapse-whitespace "line1\n \nline2")))
(should (string= result "line1\n\nline2"))))
;;; Error Cases
(ert-deftest test-collapse-whitespace-start-greater-than-end ()
"Should error when start > end."
(should-error
(with-temp-buffer
(insert "hello world")
(cj/--collapse-whitespace (point-max) (point-min)))
:type 'error))
(ert-deftest test-collapse-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/--collapse-whitespace pos pos)
;; Should complete without error and not change buffer
(should (string= (buffer-string) "hello world")))))
(provide 'test-custom-whitespace-collapse)
;;; test-custom-whitespace-collapse.el ends here
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