diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bbfcd1e..4f59936 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,5 +31,8 @@ jobs:
       - name: Lint
         run: npm run lint
 
+      - name: Test
+        run: npm run test
+
       - name: Build
         run: npm run build
diff --git a/test/integration/globalAudio.integration.test.tsx b/test/integration/globalAudio.integration.test.tsx
new file mode 100644
index 0000000..3f0c80d
--- /dev/null
+++ b/test/integration/globalAudio.integration.test.tsx
@@ -0,0 +1,107 @@
+import { waitFor } from '@testing-library/dom';
+import { cleanup, renderHook } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { audioManager, useGlobalAudio } from '../../src';
+
+const getAudioOrThrow = () => {
+  const audio = audioManager.getAudio();
+  if (!audio) {
+    throw new Error('Audio is not available in this environment.');
+  }
+  return audio;
+};
+
+beforeEach(() => {
+  cleanup();
+  audioManager.setSource(null);
+  audioManager.configure({});
+  vi.clearAllMocks();
+  audioManager.dispose();
+});
+
+afterEach(() => {
+  cleanup();
+  audioManager.dispose();
+});
+
+describe('global audio integration', () => {
+  it('switching tracks stops A and plays B, updating shared state', async () => {
+    const playSpy = vi.spyOn(HTMLMediaElement.prototype, 'play');
+    const pauseSpy = vi.spyOn(HTMLMediaElement.prototype, 'pause');
+
+    const first = renderHook(({ src }) => useGlobalAudio({ src, autoPlay: true }), {
+      initialProps: { src: 'https://example.com/a.mp3' },
+    });
+
+    await waitFor(() => {
+      expect(first.result.current.state.src).toBe('https://example.com/a.mp3');
+    });
+
+    expect(playSpy).toHaveBeenCalled();
+    getAudioOrThrow().dispatchEvent(new Event('playing'));
+
+    first.rerender({ src: 'https://example.com/b.mp3' });
+
+    await waitFor(() => {
+      expect(first.result.current.state.src).toBe('https://example.com/b.mp3');
+    });
+
+    expect(playSpy).toHaveBeenCalledTimes(2);
+    expect(pauseSpy).toHaveBeenCalled();
+    getAudioOrThrow().dispatchEvent(new Event('playing'));
+
+    await waitFor(() => {
+      expect(first.result.current.state.isPlaying).toBe(true);
+    });
+  });
+
+  it('restores progress from storage after loadedmetadata', async () => {
+    localStorage.setItem('audio:progress:https://example.com/a.mp3', '42');
+
+    const hook = renderHook(() => useGlobalAudio({ src: 'https://example.com/a.mp3' }));
+
+    await waitFor(() => {
+      expect(hook.result.current.state.src).toBe('https://example.com/a.mp3');
+    });
+
+    const audio = audioManager.getAudio();
+    if (!audio) {
+      throw new Error('Audio is not available in this environment.');
+    }
+
+    audio.dispatchEvent(new Event('loadedmetadata'));
+
+    await waitFor(() => {
+      expect(hook.result.current.state.currentTime).toBe(42);
+    });
+  });
+
+  it('keeps singleton state after unmount/remount', async () => {
+    const playSpy = vi.spyOn(HTMLMediaElement.prototype, 'play');
+
+    const first = renderHook(() =>
+      useGlobalAudio({ src: 'https://example.com/a.mp3', autoPlay: true }),
+    );
+
+    await waitFor(() => {
+      expect(first.result.current.state.src).toBe('https://example.com/a.mp3');
+    });
+
+    expect(playSpy).toHaveBeenCalled();
+    getAudioOrThrow().dispatchEvent(new Event('playing'));
+
+    await waitFor(() => {
+      expect(first.result.current.state.isPlaying).toBe(true);
+    });
+
+    first.unmount();
+
+    const second = renderHook(() => useGlobalAudio());
+
+    await waitFor(() => {
+      expect(second.result.current.state.src).toBe('https://example.com/a.mp3');
+    });
+
+    expect(second.result.current.state.isPlaying).toBe(true);
+  });
+});