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+;;; test-diff-config--ediff-options.el --- Tests for ediff diff options -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Pins the removal of the global "-w" default for `ediff-diff-options'.
+;; With "-w", every ediff session ignores ALL whitespace, so
+;; indentation-only changes (significant in Python, Makefiles, YAML)
+;; compare as identical. Whitespace-ignoring is a per-session toggle
+;; (ediff's `##'), not a global default.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'diff-config)
+
+;;; Normal Cases
+
+(ert-deftest test-diff-config-ediff-options-no-global-whitespace-ignore ()
+ "Normal: after ediff loads, no global -w sits in ediff-diff-options.
+The use-package :custom values apply when the deferred package loads,
+so the assertion must run with ediff actually loaded."
+ (require 'ediff)
+ (should (not (string-match-p "-w" (or ediff-diff-options "")))))
+
+(provide 'test-diff-config--ediff-options)
+;;; test-diff-config--ediff-options.el ends here