refactor: change separate tools by category

core/stdlib/src/sync/mutex/index.test.ts

@@ -0,0 +1,94 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { SyncMutex } from '.';
+
+describe('SyncMutex', () => {
+  let mutex: SyncMutex;
+
+  beforeEach(() => {
+    mutex = new SyncMutex();
+  });
+
+  it('unlocked by default', () => {
+    expect(mutex.isLocked).toBe(false);
+  });
+
+  it('lock the mutex', () => {
+    mutex.lock();
+  
+    expect(mutex.isLocked).toBe(true);
+  });
+
+  it('remain locked when locked multiple times', () => {
+    mutex.lock();
+    mutex.lock();
+  
+    expect(mutex.isLocked).toBe(true);
+  });
+
+  it('unlock a locked mutex', () => {
+    mutex.lock();
+    mutex.unlock();
+  
+    expect(mutex.isLocked).toBe(false);
+  });
+
+  it('remain unlocked when unlocked multiple times', () => {
+    mutex.unlock();
+    mutex.unlock();
+
+    expect(mutex.isLocked).toBe(false);
+  });
+
+  it('reflect the current lock state', () => {
+    expect(mutex.isLocked).toBe(false);
+    mutex.lock();
+    expect(mutex.isLocked).toBe(true);
+    mutex.unlock();
+    expect(mutex.isLocked).toBe(false);
+  });
+
+  it('execute a callback when unlocked', async () => {
+    const callback = vi.fn(() => 'done');
+    const result = await mutex.execute(callback);
+  
+    expect(result).toBe('done');
+    expect(callback).toHaveBeenCalled();
+  });
+
+  it('execute a promise callback when unlocked', async () => {
+    const callback = vi.fn(() => Promise.resolve('done'));
+    const result = await mutex.execute(callback);
+  
+    expect(result).toBe('done');
+    expect(callback).toHaveBeenCalled();
+  });
+
+  it('execute concurrent callbacks only one at a time', async () => {
+    const callback = vi.fn(() => Promise.resolve('done'));
+
+    const result = await Promise.all([
+      mutex.execute(callback),
+      mutex.execute(callback),
+      mutex.execute(callback),
+    ]);
+  
+    expect(result).toEqual(['done', undefined, undefined]);
+    expect(callback).toHaveBeenCalledTimes(1);
+  });
+
+  it('does not execute a callback when locked', async () => {
+    const callback = vi.fn(() => 'done');
+    mutex.lock();
+    const result = await mutex.execute(callback);
+
+    expect(result).toBeUndefined();
+    expect(callback).not.toHaveBeenCalled();
+  });
+
+  it('unlocks after executing a callback', async () => {
+    const callback = vi.fn(() => 'done');
+    await mutex.execute(callback);
+  
+    expect(mutex.isLocked).toBe(false);
+  });
+});