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diff --git a/tests/test-prog-webdev-setup.el b/tests/test-prog-webdev-setup.el
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+;;; test-prog-webdev-setup.el --- Tests for cj/webdev-setup mode hook -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Sibling tests cover the prettier format wrapper and command builder.
+;; `cj/webdev-setup' (the shared per-buffer preferences for TS/JS/TSX
+;; modes) was uncovered.  Same stub-and-assert shape as the prog-python
+;; setup test.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(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)
+(require 'prog-webdev)
+
+(defmacro test-pw-setup--with-stubs (&rest body)
+  "Stub mode-toggles + LSP primitives, then evaluate BODY."
+  `(cl-letf (((symbol-function 'company-mode) #'ignore)
+             ((symbol-function 'flyspell-prog-mode) #'ignore)
+             ((symbol-function 'superword-mode) #'ignore)
+             ((symbol-function 'electric-pair-local-mode) #'ignore))
+     ,@body))
+
+(ert-deftest test-prog-webdev-setup-sets-buffer-local-preferences ()
+  "Normal: fill-column, tab-width, standard-indent, indent-tabs-mode all
+land at the webdev defaults (100 / 2 / 2 / nil)."
+  (with-temp-buffer
+    (test-pw-setup--with-stubs
+     (cj/webdev-setup)
+     (should (= fill-column 100))
+     (should (= tab-width 2))
+     (should (= standard-indent 2))
+     (should-not indent-tabs-mode))))
+
+(ert-deftest test-prog-webdev-setup-enables-mode-helpers ()
+  "Normal: company-mode, flyspell-prog-mode, superword-mode, and
+electric-pair-local-mode all get called."
+  (with-temp-buffer
+    (let ((calls nil))
+      (cl-letf (((symbol-function 'company-mode)
+                 (lambda (&rest _) (push 'company calls)))
+                ((symbol-function 'flyspell-prog-mode)
+                 (lambda (&rest _) (push 'flyspell calls)))
+                ((symbol-function 'superword-mode)
+                 (lambda (&rest _) (push 'superword calls)))
+                ((symbol-function 'electric-pair-local-mode)
+                 (lambda (arg) (push (cons 'pair arg) calls))))
+        (cj/webdev-setup))
+      (should (memq 'company calls))
+      (should (memq 'flyspell calls))
+      (should (memq 'superword calls))
+      (should (assq 'pair calls))
+      (should (cdr (assq 'pair calls))))))
+
+(ert-deftest test-prog-webdev-setup-starts-lsp-when-tsserver-on-path ()
+  "Normal: with typescript-language-server on PATH, `lsp-deferred' fires."
+  (with-temp-buffer
+    (let ((started nil))
+      (cl-letf (((symbol-function 'company-mode) #'ignore)
+                ((symbol-function 'flyspell-prog-mode) #'ignore)
+                ((symbol-function 'superword-mode) #'ignore)
+                ((symbol-function 'electric-pair-local-mode) #'ignore)
+                ((symbol-function 'lsp-deferred)
+                 (lambda (&rest _) (setq started t)))
+                ((symbol-function 'executable-find)
+                 (lambda (path) (when (equal path ts-language-server-path)
+                                  "/usr/bin/typescript-language-server"))))
+        (cj/webdev-setup))
+      (should started))))
+
+(ert-deftest test-prog-webdev-setup-skips-lsp-without-tsserver ()
+  "Boundary: without typescript-language-server, `lsp-deferred' is NOT called."
+  (with-temp-buffer
+    (let ((started nil))
+      (cl-letf (((symbol-function 'company-mode) #'ignore)
+                ((symbol-function 'flyspell-prog-mode) #'ignore)
+                ((symbol-function 'superword-mode) #'ignore)
+                ((symbol-function 'electric-pair-local-mode) #'ignore)
+                ((symbol-function 'lsp-deferred)
+                 (lambda (&rest _) (setq started t)))
+                ((symbol-function 'executable-find) (lambda (_) nil)))
+        (cj/webdev-setup))
+      (should-not started))))
+
+(ert-deftest test-prog-webdev-keybindings-binds-format-key ()
+  "Normal: `cj/webdev-keybindings' wires C-; f to the prettier wrapper."
+  (with-temp-buffer
+    (use-local-map (make-sparse-keymap))
+    (cj/webdev-keybindings)
+    (should (eq #'cj/webdev-format-buffer (local-key-binding (kbd "C-; f"))))))
+
+(provide 'test-prog-webdev-setup)
+;;; test-prog-webdev-setup.el ends here