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diff --git a/tests/test-prog-webdev--format-wiring.el b/tests/test-prog-webdev--format-wiring.el
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+;;; test-prog-webdev--format-wiring.el --- Verify the TS/JS formatter is wired -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Webdev's binding is installed via `local-set-key' inside the
+;; `cj/webdev-keybindings' hook, fired from typescript-ts-mode,
+;; tsx-ts-mode, js-ts-mode, and web-mode. The format command itself
+;; (`cj/webdev-format-buffer') is defined in prog-webdev.el and shells
+;; out to the `prettier' binary.
+;;
+;; Three checks:
+;;   1. `cj/webdev-format-buffer' is fboundp.
+;;   2. The hook installs C-; f → `cj/webdev-format-buffer' in the
+;;      buffer-local map.
+;;   3. The `prettier' executable is on PATH.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
+(require 'testutil-format-wiring)
+
+(format-test--ensure-packages-init)
+(ignore-errors (require 'prog-webdev))
+
+(ert-deftest test-prog-webdev-format-command-fboundp ()
+  "Normal: `cj/webdev-format-buffer' is fboundp from prog-webdev."
+  (should (fboundp 'cj/webdev-format-buffer)))
+
+(ert-deftest test-prog-webdev-format-binding-resolves ()
+  "Normal: `cj/webdev-keybindings' installs C-; f → `cj/webdev-format-buffer'."
+  (with-temp-buffer
+    (cj/webdev-keybindings)
+    (should (eq 'cj/webdev-format-buffer
+                (local-key-binding (kbd "C-; f"))))))
+
+(ert-deftest test-prog-webdev-format-executable-on-path ()
+  "Boundary: `prettier' is on PATH (skipped if not installed)."
+  (format-test--skip-unless-executable "prettier")
+  (should (executable-find "prettier")))
+
+(provide 'test-prog-webdev--format-wiring)
+;;; test-prog-webdev--format-wiring.el ends here