in crates/lsp-client/src/msg.rs [431:440]
fn serialize_response_with_null_result() {
let text = "{\"id\":1,\"result\":null}";
let msg = Message::Response(Response {
id: RequestId::from(1),
content: ResponseContent::Result(serde_json::Value::Null),
});
let serialized = serde_json::to_string(&msg).unwrap();
assert_eq!(text, serialized);
}