feat(desktop): tray unread dot and monochrome tray icon (#3477)

fluxer_desktop/src/main/DesktopTrayIconSetting.test.mjs

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import {describe, test} from 'node:test';
+import {installElectronStub} from './LocalAppTestSupport.test.mjs';
+
+installElectronStub();
+
+const {getDesktopWindowBehaviorSettings, loadDesktopConfig, setDesktopWindowBehaviorSettings} = await import(
+	'../common/DesktopConfig.ts'
+);
+
+function loadSettings(windowBehavior) {
+	const userDataPath = fs.mkdtempSync(path.join(os.tmpdir(), 'fluxer-desktop-tray-setting-test-'));
+	fs.writeFileSync(path.join(userDataPath, 'settings.json'), JSON.stringify({window_behavior: windowBehavior}));
+	loadDesktopConfig(userDataPath);
+	return userDataPath;
+}
+
+function readPersisted(userDataPath) {
+	return JSON.parse(fs.readFileSync(path.join(userDataPath, 'settings.json'), 'utf8')).window_behavior;
+}
+
+describe('colored tray icon setting', () => {
+	test('defaults to the monochrome icon for existing and new configs', () => {
+		loadSettings(undefined);
+		assert.equal(getDesktopWindowBehaviorSettings().coloredTrayIcon, false);
+		loadSettings({showTrayIcon: true});
+		assert.equal(getDesktopWindowBehaviorSettings().coloredTrayIcon, false);
+	});
+
+	test('drops values that are not booleans', () => {
+		for (const value of ['true', 1, null, {}]) {
+			loadSettings({coloredTrayIcon: value});
+			assert.equal(getDesktopWindowBehaviorSettings().coloredTrayIcon, false, String(value));
+		}
+	});
+
+	test('persists and reloads the choice without touching the tray visibility', () => {
+		const userDataPath = loadSettings({showTrayIcon: false});
+		assert.equal(setDesktopWindowBehaviorSettings({coloredTrayIcon: true}).coloredTrayIcon, true);
+		assert.equal(readPersisted(userDataPath).coloredTrayIcon, true);
+		loadDesktopConfig(userDataPath);
+		const settings = getDesktopWindowBehaviorSettings();
+		assert.equal(settings.coloredTrayIcon, true);
+		assert.equal(settings.showTrayIcon, false);
+	});
+});