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+;;; test-video-audio-recording--test-device.el --- Tests for device test helper -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for cj/recording--test-device.
+;; Verifies the shared record-and-playback logic used by test-mic and test-monitor.
+
+;;; Code:
+
+(require 'ert)
+
+;; Stub dependencies before loading the module
+(defvar cj/custom-keymap (make-sparse-keymap)
+  "Stub keymap for testing.")
+
+(require 'video-audio-recording)
+
+;;; Normal Cases
+
+(ert-deftest test-video-audio-recording--test-device-normal-runs-ffmpeg-then-ffplay ()
+  "Runs exactly 2 shell commands: ffmpeg to record, ffplay to playback."
+  (let ((commands nil))
+    (cl-letf (((symbol-function 'shell-command)
+               (lambda (cmd) (push cmd commands) 0)))
+      (cj/recording--test-device "test-device" "test-" "GO!")
+      (should (= 2 (length commands)))
+      ;; ffmpeg runs first (pushed last due to stack order)
+      (should (string-match-p "ffmpeg" (cadr commands)))
+      (should (string-match-p "ffplay" (car commands))))))
+
+(ert-deftest test-video-audio-recording--test-device-normal-uses-device-in-ffmpeg ()
+  "The provided device name appears in the ffmpeg command."
+  (let ((commands nil))
+    (cl-letf (((symbol-function 'shell-command)
+               (lambda (cmd) (push cmd commands) 0)))
+      (cj/recording--test-device "alsa_input.usb-Jabra.mono" "mic-" "SPEAK!")
+      (let ((ffmpeg-cmd (cadr commands)))
+        (should (string-match-p "alsa_input.usb-Jabra.mono" ffmpeg-cmd))
+        (should (string-match-p "-t 5" ffmpeg-cmd))))))
+
+;;; Boundary Cases
+
+(ert-deftest test-video-audio-recording--test-device-boundary-device-with-special-chars ()
+  "Device names with special characters are shell-quoted."
+  (let ((commands nil))
+    (cl-letf (((symbol-function 'shell-command)
+               (lambda (cmd) (push cmd commands) 0)))
+      (cj/recording--test-device "device with spaces" "test-" "GO!")
+      (let ((ffmpeg-cmd (cadr commands)))
+        ;; shell-quote-argument should have escaped the spaces
+        (should (string-match-p "device" ffmpeg-cmd))))))
+
+;;; Error Cases
+
+(ert-deftest test-video-audio-recording--test-device-error-ffmpeg-failure-no-crash ()
+  "Function completes without error even when ffmpeg returns non-zero."
+  (cl-letf (((symbol-function 'shell-command)
+             (lambda (_cmd) 1)))
+    ;; Should not signal any error
+    (cj/recording--test-device "dev" "test-" "GO!")
+    (should t)))
+
+(provide 'test-video-audio-recording--test-device)
+;;; test-video-audio-recording--test-device.el ends here