You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/reth/examples/additional-rpc-namespace-in-cli/src
    
    the code of the file until where you have to start completion: //! Example of how to use additional rpc namespace
    
    async fn test_call_transaction_count_http() {
        let server_addr = start_server().await;
        let uri = format!("http://{}", server_addr);
        let client = HttpClientBuilder::default().build(&uri).unwrap();
        let count = TxpoolExtApiClient::transaction_count(&client).await.unwrap();
        assert_eq!(count, 0);
    }