fix: 修复 CI 卡死 + LZ4/SSTable/Checkpoint 多项 bug — 526 测试全通过

tests/engine/aria-wal-mvcc.test.ts

@@ -119,26 +119,45 @@ describe('AriaEngine — WAL', () => {
 });
 
 // ===================================================================
-//  Checkpoint 测试
+//  Checkpoint 测试（使用安全 Mock，避免 null 引用导致 CI 卡死）
 // ===================================================================
 describe('AriaEngine — CheckpointManager', () => {
   class MockFlushable implements Flushable { flushed = false; async flushAll() { this.flushed = true; } }
+  class MockLSM { flushed = false; async flush() { this.flushed = true; } }
+  class MockWAL { checkpointed = false; async checkpoint() { this.checkpointed = true; } async flush() {} }
 
   it('tick 未达间隔不触发 checkpoint', async () => {
+    const lsm = new MockLSM();
+    const wal = new MockWAL();
     const flushable = new MockFlushable();
-    const cm = new CheckpointManager(null as any, null as any, flushable, 100);
+    const cm = new CheckpointManager(lsm as any, wal as any, flushable, 100);
     await cm.tick();
     await cm.tick();
     expect(cm.getOpCount()).toBe(2);
     expect(flushable.flushed).toBe(false);
+    expect(lsm.flushed).toBe(false);
   });
 
-  it('setInterval 修改间隔', async () => {
-    const cm = new CheckpointManager(null as any, null as any, null, 1000);
+  it('setInterval 修改间隔后 tick 触发 checkpoint', async () => {
+    const lsm = new MockLSM();
+    const wal = new MockWAL();
+    const cm = new CheckpointManager(lsm as any, wal as any, null, 1000);
     cm.setInterval(2);
     await cm.tick();
     await cm.tick();
     expect(cm.getOpCount()).toBe(0); // reset after checkpoint
+    expect(lsm.flushed).toBe(true);
+    expect(wal.checkpointed).toBe(true);
+  });
+
+  it('forceCheckpoint 强制触发', async () => {
+    const lsm = new MockLSM();
+    const wal = new MockWAL();
+    const cm = new CheckpointManager(lsm as any, wal as any, null, 100);
+    await cm.forceCheckpoint();
+    expect(cm.getOpCount()).toBe(0);
+    expect(lsm.flushed).toBe(true);
+    expect(wal.checkpointed).toBe(true);
   });
 });