feat: publish av-tools 0.1.0

tests/unit/engine-lifecycle.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it, vi } from 'vitest';
+import { DeferredResourceLifecycle } from '../../src/ffmpeg/engine-lifecycle';
+
+describe('singleton engine lifecycle', () => {
+  it('cancels deferred disposal when StrictMode immediately reacquires', () => {
+    const dispose = vi.fn();
+    const deferred: Array<() => void> = [];
+    const lifecycle = new DeferredResourceLifecycle({ dispose }, (callback) =>
+      deferred.push(callback)
+    );
+
+    const releaseFirstMount = lifecycle.acquire();
+    releaseFirstMount();
+    const releaseStrictModeRemount = lifecycle.acquire();
+    deferred.shift()?.();
+
+    expect(dispose).not.toHaveBeenCalled();
+    expect(lifecycle.leaseCount).toBe(1);
+
+    releaseStrictModeRemount();
+    deferred.shift()?.();
+    expect(dispose).toHaveBeenCalledOnce();
+    expect(lifecycle.leaseCount).toBe(0);
+  });
+
+  it('disposes only after the last lease and ignores duplicate releases', () => {
+    const dispose = vi.fn();
+    const deferred: Array<() => void> = [];
+    const lifecycle = new DeferredResourceLifecycle({ dispose }, (callback) =>
+      deferred.push(callback)
+    );
+    const releaseOne = lifecycle.acquire();
+    const releaseTwo = lifecycle.acquire();
+
+    releaseOne();
+    releaseOne();
+    expect(deferred).toHaveLength(0);
+    expect(lifecycle.leaseCount).toBe(1);
+
+    releaseTwo();
+    expect(deferred).toHaveLength(1);
+    deferred[0]?.();
+    expect(dispose).toHaveBeenCalledOnce();
+  });
+});