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diff --git a/tests/testutil-vterm-buffers.el b/tests/testutil-vterm-buffers.el
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+;;; testutil-vterm-buffers.el --- Shared helpers for vterm/claude buffer tests -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Cleanup helpers and a fake-vterm constructor used across the
+;; ai-vterm and vterm-toggle test files.  Before this module, each
+;; test file re-implemented the same `(dolist (b (buffer-list))
+;; (when (string-prefix-p ...) (kill-buffer b)))' loop with a
+;; different prefix.
+
+;;; Code:
+
+(defun cj/test--kill-buffers-matching-prefix (prefix)
+  "Kill all live buffers whose name starts with PREFIX."
+  (dolist (b (buffer-list))
+    (when (string-prefix-p prefix (buffer-name b))
+      (kill-buffer b))))
+
+(defun cj/test--kill-claude-buffers ()
+  "Kill all live buffers whose name matches the AI-vterm prefix \"claude [\"."
+  (cj/test--kill-buffers-matching-prefix "claude ["))
+
+(defun cj/test--kill-test-vterm-buffers ()
+  "Kill all live buffers whose name starts with \"*test-vterm\"."
+  (cj/test--kill-buffers-matching-prefix "*test-vterm"))
+
+(defun cj/test--make-fake-vterm-buffer (name)
+  "Return a buffer named NAME with `major-mode' set to `vterm-mode'.
+
+Avoids actually launching a vterm process by setting the mode
+buffer-locally.  Used by tests that need a buffer satisfying the
+vterm-mode predicate without the side-effects of `(vterm)'."
+  (let ((buf (get-buffer-create name)))
+    (with-current-buffer buf
+      (setq-local major-mode 'vterm-mode))
+    buf))
+
+(provide 'testutil-vterm-buffers)
+;;; testutil-vterm-buffers.el ends here