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+;;; test-video-audio-recording--source-exists-p.el --- Tests for cj/recording--source-exists-p -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for cj/recording--source-exists-p function.
+;; Tests checking whether a PulseAudio source exists in pactl output.
+
+;;; Code:
+
+(require 'ert)
+
+;; Stub dependencies before loading the module
+(defvar cj/custom-keymap (make-sparse-keymap)
+  "Stub keymap for testing.")
+
+(require 'video-audio-recording)
+
+;;; Test Fixtures Helper
+
+(defun test-load-fixture (filename)
+  "Load fixture file FILENAME from tests/fixtures directory."
+  (let ((fixture-path (expand-file-name
+                       (concat "tests/fixtures/" filename)
+                       user-emacs-directory)))
+    (with-temp-buffer
+      (insert-file-contents fixture-path)
+      (buffer-string))))
+
+;;; Normal Cases
+
+(ert-deftest test-source-exists-p-normal-existing-device-returns-t ()
+  "Test that an existing device returns non-nil."
+  (let ((output (test-load-fixture "pactl-output-normal.txt")))
+    (should (cj/recording--source-exists-p
+             "alsa_output.pci-0000_00_1f.3.analog-stereo.monitor" output))))
+
+(ert-deftest test-source-exists-p-normal-input-device-returns-t ()
+  "Test that an existing input device returns non-nil."
+  (let ((output (test-load-fixture "pactl-output-normal.txt")))
+    (should (cj/recording--source-exists-p
+             "alsa_input.pci-0000_00_1f.3.analog-stereo" output))))
+
+(ert-deftest test-source-exists-p-normal-bluetooth-device-returns-t ()
+  "Test that a Bluetooth device returns non-nil."
+  (let ((output (test-load-fixture "pactl-output-normal.txt")))
+    (should (cj/recording--source-exists-p
+             "bluez_input.00:1B:66:C0:91:6D" output))))
+
+;;; Boundary Cases
+
+(ert-deftest test-source-exists-p-boundary-nonexistent-device-returns-nil ()
+  "Test that a non-existent device returns nil."
+  (let ((output (test-load-fixture "pactl-output-normal.txt")))
+    (should-not (cj/recording--source-exists-p
+                 "nonexistent_device.monitor" output))))
+
+(ert-deftest test-source-exists-p-boundary-empty-output-returns-nil ()
+  "Test that empty pactl output returns nil."
+  (should-not (cj/recording--source-exists-p "any-device" "")))
+
+(ert-deftest test-source-exists-p-boundary-partial-name-no-match ()
+  "Test that partial device name does not match."
+  (let ((output (test-load-fixture "pactl-output-normal.txt")))
+    (should-not (cj/recording--source-exists-p
+                 "alsa_output.pci-0000_00_1f.3.analog-stereo" output))))
+
+(provide 'test-video-audio-recording--source-exists-p)
+;;; test-video-audio-recording--source-exists-p.el ends here