🌐 Add Chinese translation for `docs/zh/docs/advanced/testing-websockets.md` (#3817)

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+# 测试 WebSockets
+
+测试 WebSockets 也使用 `TestClient`。
+
+为此，要在 `with` 语句中使用 `TestClient` 连接 WebSocket。
+
+```Python hl_lines="27-31"
+{!../../../docs_src/app_testing/tutorial002.py!}
+```
+
+!!! note "笔记"
+
+    更多细节详见 <a href="https://www.starlette.io/testclient/#testing-websocket-sessions" class="external-link" target="_blank">Starlette 官档 - 测试 WebSockets</a>。