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-;;; test-custom-whitespace-delete-blank-lines.el --- Tests for cj/--delete-blank-lines -*- lexical-binding: t; -*-
-
-;;; Commentary:
-;; Tests for the cj/--delete-blank-lines function from custom-whitespace.el
-;;
-;; This function deletes blank lines from text, where blank lines are defined
-;; as lines containing only whitespace (spaces, tabs) or nothing at all.
-;; Uses the regexp ^[[:space:]]*$ to match blank lines.
-;;
-;; We test the NON-INTERACTIVE implementation (cj/--delete-blank-lines)
-;; to avoid mocking user prompts. 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-delete-blank-lines (input-text)
-  "Test cj/--delete-blank-lines on INPUT-TEXT.
-Returns the buffer string after operation."
-  (with-temp-buffer
-    (insert input-text)
-    (cj/--delete-blank-lines (point-min) (point-max))
-    (buffer-string)))
-
-;;; Normal Cases
-
-(ert-deftest test-delete-blank-lines-single-blank ()
-  "Should delete single blank line between text."
-  (let ((result (test-delete-blank-lines "line1\n\nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-multiple-consecutive ()
-  "Should delete multiple consecutive blank lines."
-  (let ((result (test-delete-blank-lines "line1\n\n\n\nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-spaces-only ()
-  "Should delete lines with spaces only."
-  (let ((result (test-delete-blank-lines "line1\n   \nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-tabs-only ()
-  "Should delete lines with tabs only."
-  (let ((result (test-delete-blank-lines "line1\n\t\t\nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-mixed-whitespace ()
-  "Should delete lines with mixed whitespace."
-  (let ((result (test-delete-blank-lines "line1\n \t \t \nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-no-blank-lines ()
-  "Should handle text with no blank lines (no-op)."
-  (let ((result (test-delete-blank-lines "line1\nline2\nline3")))
-    (should (string= result "line1\nline2\nline3"))))
-
-(ert-deftest test-delete-blank-lines-at-start ()
-  "Should delete blank lines at start of region."
-  (let ((result (test-delete-blank-lines "\n\nline1\nline2")))
-    (should (string= result "line1\nline2"))))
-
-(ert-deftest test-delete-blank-lines-at-end ()
-  "Should delete blank lines at end of region."
-  (let ((result (test-delete-blank-lines "line1\nline2\n\n")))
-    (should (string= result "line1\nline2\n"))))
-
-(ert-deftest test-delete-blank-lines-scattered ()
-  "Should delete blank lines scattered throughout text."
-  (let ((result (test-delete-blank-lines "line1\n\nline2\n   \nline3\n\t\nline4")))
-    (should (string= result "line1\nline2\nline3\nline4"))))
-
-;;; Boundary Cases
-
-(ert-deftest test-delete-blank-lines-empty-string ()
-  "Should handle empty string."
-  (let ((result (test-delete-blank-lines "")))
-    (should (string= result ""))))
-
-(ert-deftest test-delete-blank-lines-only-blank-lines ()
-  "Should delete all lines if only blank lines exist."
-  (let ((result (test-delete-blank-lines "\n\n\n")))
-    (should (string= result ""))))
-
-(ert-deftest test-delete-blank-lines-only-whitespace ()
-  "Should delete lines containing only whitespace."
-  (let ((result (test-delete-blank-lines "   \n\t\t\n \t ")))
-    (should (string= result ""))))
-
-(ert-deftest test-delete-blank-lines-single-line-content ()
-  "Should handle single line with content (no-op)."
-  (let ((result (test-delete-blank-lines "hello world")))
-    (should (string= result "hello world"))))
-
-(ert-deftest test-delete-blank-lines-single-blank-line ()
-  "Should delete single blank line."
-  (let ((result (test-delete-blank-lines "\n")))
-    (should (string= result ""))))
-
-(ert-deftest test-delete-blank-lines-very-long-region ()
-  "Should handle very long region with many blank lines."
-  (let* ((lines (make-list 100 "content"))
-         (input (mapconcat #'identity lines "\n\n"))
-         (expected (mapconcat #'identity lines "\n"))
-         (result (test-delete-blank-lines input)))
-    (should (string= result expected))))
-
-(ert-deftest test-delete-blank-lines-preserve-content-lines ()
-  "Should preserve lines with any non-whitespace content."
-  (let ((result (test-delete-blank-lines "x\n\ny\n   \nz")))
-    (should (string= result "x\ny\nz"))))
-
-;;; Error Cases
-
-(ert-deftest test-delete-blank-lines-start-greater-than-end ()
-  "Should error when start > end."
-  (should-error
-   (with-temp-buffer
-     (insert "line1\n\nline2")
-     (cj/--delete-blank-lines (point-max) (point-min)))
-   :type 'error))
-
-(ert-deftest test-delete-blank-lines-empty-region ()
-  "Should handle empty region (start == end) without error."
-  (with-temp-buffer
-    (insert "line1\n\nline2")
-    (let ((pos (/ (+ (point-min) (point-max)) 2)))
-      (cj/--delete-blank-lines pos pos)
-      ;; Should complete without error
-      (should (string-match-p "line1" (buffer-string))))))
-
-(provide 'test-custom-whitespace-delete-blank-lines)
-;;; test-custom-whitespace-delete-blank-lines.el ends here