Function string 

pub fn string() -> ExpectString

Expect a string. See ExpectString for further methods to defined the length, and partial contents, that is expected.

use axum_test::expect_json;

let server = TestServer::new(Router::new())?;

server.get(&"/user/barrington")
    .await
    .assert_json(&json!({
        "name": expect_json::string(),
    }));