test(player): lock primary-device audio policy for issue 260

docs/ISSUE-260-PHONE-CLIENT-NO-AUDIO-GUARD-ARTIFACT.md

@@ -0,0 +1,18 @@
+# Issue #260 Artifact — Phone/client no-audio guard (primary-device only playback)
+
+## Scope
+Added regression coverage for MVP audio policy to ensure phone/client flows never claim playback ownership, while primary-device playback stays unaffected.
+
+## Acceptance mapping
+1. **client/phone triggers no playback**
+   - Existing test coverage retained in `player-shell.component.spec.ts`:
+     - `does not trigger original media play during player-shell init path`
+     - `installs secondary-device audio guard while player shell is mounted`
+2. **primary device playback unaffected**
+   - New negative test in `player-shell.component.spec.ts`:
+     - `keeps primary-device playback untouched when no-audio capability is disabled`
+3. **one negative test for phone audio**
+   - Existing negative path preserved:
+     - `does not trigger original media play during player-shell init path`
+4. **no backend contract changes**
+   - Frontend test/docs-only scope; no backend contract files changed.

frontend/angular/src/app/features/player/player-shell.component.spec.ts

@@ -468,6 +468,33 @@ describe('PlayerShellComponent gameplay wiring', () => {
     component.ngOnDestroy();
   });
 
+  it('keeps primary-device playback untouched when no-audio capability is disabled', async () => {
+    const originalPlay = vi.fn().mockResolvedValue(undefined);
+    const mediaPrototype = { play: originalPlay };
+
+    vi.stubGlobal('window', {
+      location: { hash: '', search: '' },
+      history: { state: null, replaceState: vi.fn() },
+      localStorage: { getItem: vi.fn().mockReturnValue('en'), setItem: vi.fn(), removeItem: vi.fn() },
+      sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() },
+      HTMLMediaElement: { prototype: mediaPrototype },
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+    });
+    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
+
+    const component = new PlayerShellComponent();
+    (component as any).clientHasNoAudioOutput = false;
+
+    component.ngOnInit();
+
+    await expect(mediaPrototype.play()).resolves.toBeUndefined();
+    expect(mediaPrototype.play).toBe(originalPlay);
+    expect((mediaPrototype as any).__wppSecondaryDeviceAudioGuard__).toBeUndefined();
+
+    component.ngOnDestroy();
+  });
+
   it('resolves i18n warning copy from shared catalog without key fallback', () => {
     const component = new PlayerShellComponent();