test/clangd/exit-with-shutdown.test

# RUN: clangd -lit-test < %s
{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"processId":123,"rootPath":"clangd","capabilities":{},"trace":"off"}}
---
{"jsonrpc":"2.0","id":3,"method":"shutdown"}
---
{"jsonrpc":"2.0","method":"exit"}