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+;;; test-video-audio-recording--get-default-sink-monitor.el --- Tests for default sink monitor -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for cj/recording--get-default-sink-monitor.
+;; This function returns the monitor source name for the default audio
+;; output, which captures "what you hear" (call audio, music, etc.).
+
+;;; 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--get-default-sink-monitor-normal-appends-monitor ()
+  "Test that .monitor is appended to the default sink name."
+  (cl-letf (((symbol-function 'shell-command-to-string)
+             (lambda (_cmd) "alsa_output.usb-JDS_Labs-00.analog-stereo\n")))
+    (should (equal "alsa_output.usb-JDS_Labs-00.analog-stereo.monitor"
+                   (cj/recording--get-default-sink-monitor)))))
+
+(ert-deftest test-video-audio-recording--get-default-sink-monitor-normal-trims-whitespace ()
+  "Test that trailing whitespace/newlines are stripped from sink name."
+  (cl-letf (((symbol-function 'shell-command-to-string)
+             (lambda (_cmd) "  alsa_output.pci-0000.analog-stereo  \n")))
+    (should (equal "alsa_output.pci-0000.analog-stereo.monitor"
+                   (cj/recording--get-default-sink-monitor)))))
+
+(ert-deftest test-video-audio-recording--get-default-sink-monitor-normal-bluetooth-sink ()
+  "Test with a bluetooth default sink."
+  (cl-letf (((symbol-function 'shell-command-to-string)
+             (lambda (_cmd) "bluez_output.AA_BB_CC_DD_EE_FF.a2dp-sink\n")))
+    (should (equal "bluez_output.AA_BB_CC_DD_EE_FF.a2dp-sink.monitor"
+                   (cj/recording--get-default-sink-monitor)))))
+
+;;; Error Cases
+
+(ert-deftest test-video-audio-recording--get-default-sink-monitor-error-empty-output ()
+  "Test that empty pactl output signals user-error."
+  (cl-letf (((symbol-function 'shell-command-to-string)
+             (lambda (_cmd) "")))
+    (should-error (cj/recording--get-default-sink-monitor) :type 'user-error)))
+
+(ert-deftest test-video-audio-recording--get-default-sink-monitor-error-whitespace-only ()
+  "Test that whitespace-only output signals user-error."
+  (cl-letf (((symbol-function 'shell-command-to-string)
+             (lambda (_cmd) "  \n  ")))
+    (should-error (cj/recording--get-default-sink-monitor) :type 'user-error)))
+
+(provide 'test-video-audio-recording--get-default-sink-monitor)
+;;; test-video-audio-recording--get-default-sink-monitor.el ends here