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+;;; test-system-lib-confirm-strong.el --- Tests for cj/confirm-strong -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; ERT tests for `cj/confirm-strong', the typed-"yes" confirmation used for
+;; irreversible actions.  The behavior under test is the long-form guarantee:
+;; the prompt demands a typed yes/no even when the global single-key default
+;; (`use-short-answers') is in effect.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'system-lib)
+
+(ert-deftest test-system-lib-confirm-strong-returns-t-on-yes ()
+  "Normal: passes a t answer through from `yes-or-no-p'."
+  (cl-letf (((symbol-function 'yes-or-no-p) (lambda (&rest _) t)))
+    (should (eq (cj/confirm-strong "Really? ") t))))
+
+(ert-deftest test-system-lib-confirm-strong-returns-nil-on-no ()
+  "Normal: passes a nil answer through from `yes-or-no-p'."
+  (cl-letf (((symbol-function 'yes-or-no-p) (lambda (&rest _) nil)))
+    (should (eq (cj/confirm-strong "Really? ") nil))))
+
+(ert-deftest test-system-lib-confirm-strong-forces-long-form ()
+  "Boundary: binds `use-short-answers' to nil for the call even when it is
+globally t, so the irreversible prompt requires a typed yes/no regardless of
+the single-key default."
+  (let ((use-short-answers t)
+        (seen 'unset))
+    (cl-letf (((symbol-function 'yes-or-no-p)
+               (lambda (&rest _) (setq seen use-short-answers) t)))
+      (cj/confirm-strong "Really? ")
+      (should (eq seen nil)))))
+
+(provide 'test-system-lib-confirm-strong)
+;;; test-system-lib-confirm-strong.el ends here