feat: handle shutdown and exit

close #33

src/main.rs

@@ -85,6 +85,13 @@ fn main_loop(server: &mut TestingLS) -> Result<(), LSError> {
                     let id = value["id"].as_i64().unwrap();
                     server.initialize(id, initialize_params)?;
                 }
+                "shutdown" => {
+                    let id = value["id"].as_i64().unwrap();
+                    server.shutdown(id)?;
+                }
+                "exit" => {
+                    std::process::exit(0);
+                }
                 "workspace/diagnostic" => {
                     server.diagnose_workspace()?;
                 }

src/server.rs

@@ -452,6 +452,15 @@ impl TestingLS {
         }))?;
         Ok(())
     }
+
+    pub fn shutdown(&self, id: i64) -> Result<(), LSError> {
+        send_stdout(&json!({
+            "jsonrpc": "2.0",
+            "id": id,
+            "method": json!(null),
+        }))?;
+        Ok(())
+    }
 }
 
 #[cfg(test)]