优化

server/plugins/com.msgbyte.linkmeta/utils/__tests__/fetchLinkPreview.spec.ts

@@ -0,0 +1,52 @@
+import { fetchLinkPreview } from '../fetchLinkPreview';
+
+const mockGetLinkPreviewFn = jest.fn();
+jest.mock('link-preview-js', () => ({
+  getLinkPreview: async () => {
+    mockGetLinkPreviewFn();
+  },
+}));
+
+describe('Test "fetchLinkPreview"', () => {
+  test(
+    'fetchLinkPreview should merge same request',
+    async () => {
+      await Promise.all([
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+      ]);
+
+      expect(mockGetLinkPreviewFn.mock.calls.length).toBe(1);
+
+      await sleep(5 * 1000); // 度过窗口期
+
+      await Promise.all([
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+        fetchLinkPreview('foo'),
+      ]);
+
+      expect(mockGetLinkPreviewFn.mock.calls.length).toBe(2);
+    },
+    10 * 1000
+  );
+});
+
+function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) =>
+    setTimeout(() => {
+      resolve();
+    }, ms)
+  );
+}