Hide title bar on macOS

ts/test-node/util/toggleMaximizedBrowserWindow_test.ts

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+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as sinon from 'sinon';
+import { BrowserWindow } from 'electron';
+
+import { toggleMaximizedBrowserWindow } from '../../util/toggleMaximizedBrowserWindow';
+
+describe('toggleMaximizedBrowserWindow', () => {
+  const createFakeWindow = () => ({
+    isMaximized: sinon.stub(),
+    unmaximize: sinon.spy(),
+    maximize: sinon.spy(),
+  });
+
+  it('maximizes an unmaximized window', () => {
+    const browserWindow = createFakeWindow();
+    browserWindow.isMaximized.returns(false);
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    toggleMaximizedBrowserWindow((browserWindow as any) as BrowserWindow);
+
+    sinon.assert.calledOnce(browserWindow.maximize);
+    sinon.assert.notCalled(browserWindow.unmaximize);
+  });
+
+  it('unmaximizes a maximized window', () => {
+    const browserWindow = createFakeWindow();
+    browserWindow.isMaximized.returns(true);
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    toggleMaximizedBrowserWindow((browserWindow as any) as BrowserWindow);
+
+    sinon.assert.notCalled(browserWindow.maximize);
+    sinon.assert.calledOnce(browserWindow.unmaximize);
+  });
+});