Officially support the system tray on Windows

ts/test-node/types/Settings_test.ts

@@ -1,4 +1,4 @@
-// Copyright 2018-2020 Signal Messenger, LLC
+// Copyright 2018-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import os from 'os';
@@ -167,4 +167,22 @@ describe('Settings', () => {
       assert.isTrue(Settings.isDrawAttentionSupported());
     });
   });
+
+  describe('isSystemTraySupported', () => {
+    it('returns false on macOS', () => {
+      sandbox.stub(process, 'platform').value('darwin');
+      assert.isFalse(Settings.isSystemTraySupported());
+    });
+
+    it('returns true on Windows 8', () => {
+      sandbox.stub(process, 'platform').value('win32');
+      sandbox.stub(os, 'release').returns('8.0.0');
+      assert.isTrue(Settings.isSystemTraySupported());
+    });
+
+    it('returns false on Linux', () => {
+      sandbox.stub(process, 'platform').value('linux');
+      assert.isFalse(Settings.isSystemTraySupported());
+    });
+  });
 });

ts/test-node/types/SystemTraySetting_test.ts

@@ -0,0 +1,55 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import {
+  SystemTraySetting,
+  parseSystemTraySetting,
+  shouldMinimizeToSystemTray,
+} from '../../types/SystemTraySetting';
+
+describe('system tray setting utilities', () => {
+  describe('shouldMinimizeToSystemTray', () => {
+    it('returns false if the system tray is disabled', () => {
+      assert.isFalse(
+        shouldMinimizeToSystemTray(SystemTraySetting.DoNotUseSystemTray)
+      );
+    });
+
+    it('returns true if the system tray is enabled', () => {
+      assert.isTrue(
+        shouldMinimizeToSystemTray(SystemTraySetting.MinimizeToSystemTray)
+      );
+      assert.isTrue(
+        shouldMinimizeToSystemTray(
+          SystemTraySetting.MinimizeToAndStartInSystemTray
+        )
+      );
+    });
+  });
+
+  describe('parseSystemTraySetting', () => {
+    it('parses valid strings into their enum values', () => {
+      assert.strictEqual(
+        parseSystemTraySetting('DoNotUseSystemTray'),
+        SystemTraySetting.DoNotUseSystemTray
+      );
+      assert.strictEqual(
+        parseSystemTraySetting('MinimizeToSystemTray'),
+        SystemTraySetting.MinimizeToSystemTray
+      );
+      assert.strictEqual(
+        parseSystemTraySetting('MinimizeToAndStartInSystemTray'),
+        SystemTraySetting.MinimizeToAndStartInSystemTray
+      );
+    });
+
+    it('parses invalid strings to DoNotUseSystemTray', () => {
+      assert.strictEqual(
+        parseSystemTraySetting('garbage'),
+        SystemTraySetting.DoNotUseSystemTray
+      );
+    });
+  });
+});