[test] Add tests for cyclic arrays in Flight and Flight Reply

packages/react-client/src/__tests__/ReactFlight-test.js

@@ -727,6 +727,25 @@ describe('ReactFlight', () => {
     });
   });
 
+  it('can transport cyclic arrays', async () => {
+    function ComponentClient({prop, obj}) {
+      expect(prop[1]).toBe(prop);
+      expect(prop[0]).toBe(obj);
+    }
+    const Component = clientReference(ComponentClient);
+
+    const obj = {};
+    const cyclic = [obj];
+    cyclic[1] = cyclic;
+    const model = <Component prop={cyclic} obj={obj} />;
+
+    const transport = ReactNoopFlightServer.render(model);
+
+    await act(async () => {
+      ReactNoop.render(await ReactNoopFlightClient.read(transport));
+    });
+  });
+
   it('can render a lazy component as a shared component on the server', async () => {
     function SharedComponent({text}) {
       return (

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMReply-test.js

@@ -650,6 +650,17 @@ describe('ReactFlightDOMReply', () => {
     expect(root.prop.obj).toBe(root.prop);
   });
 
+  it('can transport cyclic arrays', async () => {
+    const obj = {};
+    const cyclic = [obj];
+    cyclic[1] = cyclic;
+
+    const body = await ReactServerDOMClient.encodeReply({prop: cyclic, obj});
+    const root = await ReactServerDOMServer.decodeReply(body, webpackServerMap);
+    expect(root.prop[1]).toBe(root.prop);
+    expect(root.prop[0]).toBe(root.obj);
+  });
+
   it('can abort an unresolved model and get the partial result', async () => {
     const promise = new Promise(r => {});
     const controller = new AbortController();