public async void CanExportUsers_AllUsers_ShouldReturn_username()
        {
            // Arrange
            var username = "******";

            // Act
            var result = await _redcapApi.ExportUsersAsync(_token, ReturnFormat.json);

            // Assert
            Assert.Contains(username, result);
        }
        public void CanExportUsers_AllUsers_ShouldReturn_username()
        {
            // Arrange
            var apiKey      = _token;
            var apiEndpoint = _uri;
            var username    = "******";
            // Act
            var redcap_api = new RedcapApi(apiKey, apiEndpoint);
            var result     = redcap_api.ExportUsersAsync(ReturnFormat.json, OnErrorFormat.json).Result;
            var data       = result;

            // Assert
            Assert.Contains(username, data);
        }