add test for yume-chan/ya-webadb#611

packages/demo/src/pages/forward.tsx

@@ -0,0 +1,50 @@
+import { NOOP, decodeUtf8, encodeUtf8 } from "@yume-chan/adb";
+import {
+    ConsumableWritableStream,
+    WritableStream,
+} from "@yume-chan/stream-extra";
+import { makeAutoObservable, reaction, runInAction } from "mobx";
+import { observer } from "mobx-react-lite";
+import { NextPage } from "next";
+import { GLOBAL_STATE } from "../state";
+
+const state = makeAutoObservable({
+    log: [] as string[],
+});
+
+reaction(
+    () => GLOBAL_STATE.adb,
+    async (device) => {
+        if (!device) {
+            return;
+        }
+
+        const socket = await device.createSocket("tcp:27042");
+        runInAction(() => {
+            state.log.push(`connected`);
+        });
+        const writer = socket.writable.getWriter();
+        await ConsumableWritableStream.write(writer, encodeUtf8("Hello\n"));
+
+        const reader = socket.readable.getReader();
+        const result = await reader.read();
+        if (result.value) {
+            runInAction(() => {
+                state.log.push(`received: ${decodeUtf8(result.value!)}`);
+            });
+        }
+    },
+    { fireImmediately: true },
+);
+
+const ForwardTesterPage: NextPage = () => {
+    return (
+        <div>
+            {state.log.map((line, index) => (
+                <div key={index}>{line}</div>
+            ))}
+        </div>
+    );
+};
+
+export default observer(ForwardTesterPage);