Testing a REST API POST Request

AnyClass.swift

class AnyClass {

    func restApiPostRequest() {
            let url = URL(string: "https://reqres.in/api/users")!
            var request = URLRequest(url: url)
            request.httpMethod = "POST"
            request.addValue("application/json", forHTTPHeaderField: "Content-Type")
            let userData = ["name": "John", "position": "Software Engineer", "age": "37"]
            do { let jsonData = try JSONSerialization.data(withJSONObject: userData, options: .prettyPrinted)
                request.httpBody = jsonData }
            catch { print("Error: \(error)") }
            let task = URLSession.shared.dataTask(with: request) { data, response, error in
                guard let data, let response else { fatalError("There is no valid data.") }
                print("Data: \(data)")
                print("Response: \(response)")
                if let error { fatalError("Error: \(error)")} }
            task.resume()
        }
  
}