How to reuse assertions for scenarios in single feature file using Karate?

Question

I want to assert responseTime of all scenarios. But i do not want to repeat the assertion code in every scenario. Below is my feature file:

Feature: Reqres api test cases

  Background: base url
    Given url base_url

  Scenario: list single user get request
    Given path single_user_path
    When method get
    Then status 200
    And assert responseTime < 4000

Scenario: create user using post and inline json payload
    * def path = '/users'
    Given path path
    And request {"name": "morpheus","job": "leader"}
    When method post
    Then status 201
    And assert responseTime < 4000

In the above code block, I want to avoid responseTime assertion duplication. How to achieve this in karate?. Please help.

Answer 1

No this is not supported and not planned either. It is unlikely every API call will have the exact same SLA. Also this is what the Gatling integration is for: https://stackoverflow.com/a/55146463/143475

EDIT as an example of how you can do "reuse" of response assertions:

Feature:

Background:
* def validateResponse =
"""
function() {
  var contentType = karate.get("responseHeaders['Content-Type'][0]");
  if (contentType !== 'application/json') {
    karate.fail('content type is not json');
  }
  var responseType = karate.get('responseType');
  if (responseType !== 'json') {
    karate.fail('response type is not json');
  }
}
"""

Scenario:
* url 'https://httpbin.org/post'
* request { foo: 'bar' }
* method post
* validateResponse()

Please note that I absolutely don't recommend the above approach because of reasons best explained here: https://stackoverflow.com/a/54126724/143475