From 81e08afa0094db3b1ba355ffd4832f4884074908 Mon Sep 17 00:00:00 2001
From: Josh Knapp <jknapp85@gmail.com>
Date: Sun, 26 Apr 2026 09:35:53 -0700
Subject: [PATCH] Add tests for null no-change and zero as real value

---
 desktop-client/tests/state.test.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/desktop-client/tests/state.test.js b/desktop-client/tests/state.test.js
index 9c9f3b6..408153f 100644
--- a/desktop-client/tests/state.test.js
+++ b/desktop-client/tests/state.test.js
@@ -45,3 +45,15 @@ test('mergeState does not mutate inputs', () => {
   assert.deepEqual(current, before);
   assert.deepEqual(update, { title: 'X' });
 });
+
+test('mergeState treats null fields as no-change', () => {
+  const current = { ...initialState, title: 'Previous' };
+  const next = mergeState(current, { title: null });
+  assert.equal(next.title, 'Previous');
+});
+
+test('mergeState applies 0 as a real value (not a no-change)', () => {
+  const current = { ...initialState, progress: 42 };
+  const next = mergeState(current, { progress: 0 });
+  assert.equal(next.progress, 0);
+});