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+;;; test-org-drill-config--drill-files-or-error.el --- Tests for validated drill file listing -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for cj/--drill-files-or-error, the single validated entry point
+;; that drill capture templates and the drill commands share.  It returns the
+;; drill files in a directory or signals a clear `user-error' when the
+;; directory is missing, unreadable, or empty — instead of leaking a low-level
+;; error from `directory-files' or handing `completing-read' an empty list.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'org-drill-config)
+
+;;; Normal Cases
+
+(ert-deftest test-org-drill--files-or-error-normal-lists-org-files ()
+  "Normal: a directory with drill files returns their names."
+  (let ((dir (make-temp-file "cj-drill-or-error-" t)))
+    (unwind-protect
+        (progn
+          (write-region "" nil (expand-file-name "a.org" dir))
+          (write-region "" nil (expand-file-name "b.org" dir))
+          (should (equal '("a.org" "b.org")
+                         (cj/--drill-files-or-error dir))))
+      (delete-directory dir t))))
+
+;;; Boundary Cases
+
+(ert-deftest test-org-drill--files-or-error-boundary-empty-dir-signals ()
+  "Boundary: an existing but empty directory signals a clear user-error."
+  (let ((dir (make-temp-file "cj-drill-or-error-empty-" t)))
+    (unwind-protect
+        (should-error (cj/--drill-files-or-error dir) :type 'user-error)
+      (delete-directory dir t))))
+
+(ert-deftest test-org-drill--files-or-error-boundary-only-non-org-signals ()
+  "Boundary: a directory with no .org files signals a user-error."
+  (let ((dir (make-temp-file "cj-drill-or-error-nonorg-" t)))
+    (unwind-protect
+        (progn
+          (write-region "" nil (expand-file-name "notes.txt" dir))
+          (should-error (cj/--drill-files-or-error dir) :type 'user-error))
+      (delete-directory dir t))))
+
+;;; Error Cases
+
+(ert-deftest test-org-drill--files-or-error-missing-dir-signals-user-error ()
+  "Error: a missing directory signals a `user-error', not a low-level error."
+  (should-error (cj/--drill-files-or-error "/no/such/cj-drill/dir/")
+                :type 'user-error))
+
+(provide 'test-org-drill-config--drill-files-or-error)
+;;; test-org-drill-config--drill-files-or-error.el ends here