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diff --git a/tests/test-chrono-tools--sound-helpers.el b/tests/test-chrono-tools--sound-helpers.el
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+++ b/tests/test-chrono-tools--sound-helpers.el
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+;;; test-chrono-tools--sound-helpers.el --- Tests for the tmr sound-file helpers -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; cj/tmr--current-sound-name and cj/tmr--apply-sound-file were extracted from
+;; the deeply-nested cj/tmr-select-sound-file so the "what's the current sound"
+;; and "set the chosen sound" steps are unit-testable apart from the
+;; completing-read UI.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'chrono-tools)
+
+(defvar tmr-sound-file)
+(defvar sounds-dir)
+(defvar notification-sound)
+
+(ert-deftest test-chrono-current-sound-name-existing ()
+  "Normal: returns the basename when the current sound file exists."
+  (let* ((f (make-temp-file "tmr-sound" nil ".wav"))
+         (tmr-sound-file f))
+    (unwind-protect
+        (should (equal (cj/tmr--current-sound-name) (file-name-nondirectory f)))
+      (delete-file f))))
+
+(ert-deftest test-chrono-current-sound-name-missing-or-nil ()
+  "Boundary: a missing file or nil yields nil."
+  (let ((tmr-sound-file "/no/such/file.wav"))
+    (should (null (cj/tmr--current-sound-name))))
+  (let ((tmr-sound-file nil))
+    (should (null (cj/tmr--current-sound-name)))))
+
+(ert-deftest test-chrono-apply-sound-file-sets-and-messages ()
+  "Normal: sets tmr-sound-file under sounds-dir and reports the choice."
+  (let ((sounds-dir "/snd")
+        (notification-sound "/snd/default.wav")
+        (tmr-sound-file nil))
+    (let ((msg (cj/tmr--apply-sound-file "chime.wav")))
+      (should (equal tmr-sound-file "/snd/chime.wav"))
+      (should (string-match-p "Timer sound set to: chime.wav" msg)))))
+
+(ert-deftest test-chrono-apply-sound-file-default-branch ()
+  "Boundary: choosing the notification sound reports it as the default."
+  (let ((sounds-dir "/snd")
+        (notification-sound "/snd/default.wav")
+        (tmr-sound-file nil))
+    (let ((msg (cj/tmr--apply-sound-file "default.wav")))
+      (should (equal tmr-sound-file "/snd/default.wav"))
+      (should (string-match-p "default: default.wav" msg)))))
+
+(provide 'test-chrono-tools--sound-helpers)
+;;; test-chrono-tools--sound-helpers.el ends here