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diff --git a/tests/test-mail-config-refile-folder.el b/tests/test-mail-config-refile-folder.el
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+;;; test-mail-config-refile-folder.el --- Tests for refile-folder dispatch -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; ERT tests for `cj/mu4e--refile-folder-for-maildir', the per-message refile
+;; (archive) target dispatch.  cmail has a real synced Archive folder; the
+;; Gmail-backed accounts (gmail, dmail) have none, so refiling them must signal
+;; rather than move mail into an unsynced, phantom folder (silent mail loss).
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'mail-config)
+
+(ert-deftest test-mail-config-refile-cmail-returns-archive ()
+  "Normal: a cmail message refiles into the synced /cmail/Archive folder."
+  (should (string= (cj/mu4e--refile-folder-for-maildir "/cmail/INBOX")
+                   "/cmail/Archive"))
+  (should (string= (cj/mu4e--refile-folder-for-maildir "/cmail/Sent")
+                   "/cmail/Archive")))
+
+(ert-deftest test-mail-config-refile-gmail-signals ()
+  "Error: gmail has no synced archive folder, so refile signals rather than
+moving mail into a phantom folder."
+  (should-error (cj/mu4e--refile-folder-for-maildir "/gmail/INBOX")
+                :type 'user-error))
+
+(ert-deftest test-mail-config-refile-dmail-signals ()
+  "Error: dmail (Gmail-backed) has no synced archive folder; refile signals."
+  (should-error (cj/mu4e--refile-folder-for-maildir "/dmail/INBOX")
+                :type 'user-error))
+
+(ert-deftest test-mail-config-refile-nil-maildir-signals ()
+  "Boundary: a message with no maildir cannot be refiled; signal."
+  (should-error (cj/mu4e--refile-folder-for-maildir nil)
+                :type 'user-error))
+
+(provide 'test-mail-config-refile-folder)
+;;; test-mail-config-refile-folder.el ends here