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diff --git a/tests/testutil-ghostel-buffers.el b/tests/testutil-ghostel-buffers.el
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+;;; testutil-ghostel-buffers.el --- Shared helpers for ghostel/agent buffer tests -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Cleanup helpers and a fake-ghostel constructor used across the
+;; ai-term and term-toggle test files.  Replaces the older
+;; testutil-vterm-buffers helpers when the terminal engine moved from
+;; vterm to ghostel.
+
+;;; Code:
+
+(require 'cl-lib)
+
+(defun cj/test--call-as-gui (fn)
+  "Call FN, stubbing `env-terminal-p' to return nil (a GUI frame).
+
+The terminal refuse-guard was dropped when ghostel replaced vterm (ghostel
+renders in TTY frames too), so this no longer gates behavior; it is kept as a
+thin passthrough so window-behavior tests written against the old guard keep
+working unchanged."
+  (cl-letf (((symbol-function 'env-terminal-p) (lambda () nil)))
+    (funcall fn)))
+
+(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-agent-buffers ()
+  "Kill all live buffers whose name matches the AI-term prefix \"agent [\"."
+  (cj/test--kill-buffers-matching-prefix "agent ["))
+
+(defun cj/test--kill-test-term-buffers ()
+  "Kill all live buffers whose name starts with \"*test-term\"."
+  (cj/test--kill-buffers-matching-prefix "*test-term"))
+
+(defun cj/test--make-fake-ghostel-buffer (name)
+  "Return a buffer named NAME with `major-mode' set to `ghostel-mode'.
+
+Avoids actually launching a ghostel process by setting the mode
+buffer-locally.  Used by tests that need a buffer satisfying the
+ghostel-mode predicate without the side-effects of `(ghostel)'."
+  (let ((buf (get-buffer-create name)))
+    (with-current-buffer buf
+      (setq-local major-mode 'ghostel-mode))
+    buf))
+
+(provide 'testutil-ghostel-buffers)
+;;; testutil-ghostel-buffers.el ends here