device: add test

Author: clairep94

client/utils/device.test.ts

@@ -0,0 +1,29 @@
+import { isMac } from './device';
+
+describe('isMac', () => {
+  const originalUserAgent = navigator.userAgent;
+
+  afterEach(() => {
+    // Restore the original userAgent after each test
+    Object.defineProperty(navigator, 'userAgent', {
+      value: originalUserAgent,
+      configurable: true
+    });
+  });
+
+  it('returns true when userAgent contains "Mac"', () => {
+    Object.defineProperty(navigator, 'userAgent', {
+      value: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)',
+      configurable: true
+    });
+    expect(isMac()).toBe(true);
+  });
+
+  it('returns false when userAgent does not contain "Mac"', () => {
+    Object.defineProperty(navigator, 'userAgent', {
+      value: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
+      configurable: true
+    });
+    expect(isMac()).toBe(false);
+  });
+});