fix(test): fix tool deserialization error (#68)

crates/rmcp/tests/test_deserialization.rs

@@ -0,0 +1,15 @@
+use rmcp::model::{JsonRpcResponse, ServerJsonRpcMessage, ServerResult};
+#[test]
+fn test_tool_list_result() {
+    let json = std::fs::read("tests/test_deserialization/tool_list_result.json").unwrap();
+    let result: ServerJsonRpcMessage = serde_json::from_slice(&json).unwrap();
+    println!("{result:#?}");
+
+    assert!(matches!(
+        result,
+        ServerJsonRpcMessage::Response(JsonRpcResponse {
+            result: ServerResult::ListToolsResult(_),
+            ..
+        })
+    ));
+}