Dynamically set a XML tag value while building payload - testing

Question

I am trying automate testing using Karate.
I have a XML payload.
I have a static XML payload which I am readying from a file and I want to call my service in loop.
For each call I would like to replace value for a tag name dynamically.
How would I achieve this?
e.g.
Below is my Main Feature which calls my common feature in loop
Feature: Loop Call
Background:
* def common = call read('classpath:CommonFeatures.feature')
Scenario:
* table table
| payload_file | field_tag | field_value |
| 'HappyPath.xml' | 'car_fuel' | 'Gas' |
| 'HappyPath.xml' | 'car_color'| 'Red' |
* def response = call read('classpath:Car.feature') table
Car.feature
Feature: Common
Scenario:
* print payload_file
* print field_tag
* print field_value
* xml payload = read('classpath:/payload/'+payload_file)
* print payload
* set payload/$field_tag = field_value
This is where I have issue setting the field_tag value.
I have other option to do this like writing a small java script method to replace the tag value or a small java class which use DOMParser or SAXParser to perform the same.
However I would like to know if there is any karate in build way to perform the same.
Also while using java script method to replace the tag value if I am using var parser = new DOMParser(); and it seems DOMParser is not available to use. Is there a way to make this available?

Answer 1

I think if you go through this sample, it will answer all your questions:
https://github.com/intuit/karate/blob/master/karate-junit4/src/test/java/com/intuit/karate/junit4/xml/xml.feature
For example this is how you can substitute values, as well replace a whole chunk of XML (which can include tags) using the set keyword:
Scenario: set xml chunks using xpath
* def req = read('envelope1.xml')
* def phone = '123456'
* def search =
"""
<acc:getAccountByPhoneNumber>
<acc:phoneNumber>#(phone)</acc:phoneNumber>
</acc:getAccountByPhoneNumber>
"""
* set req /Envelope/Body = search
* match req ==
"""
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:acc="http://foo/bar">
<soapenv:Header />
<soapenv:Body>
<acc:getAccountByPhoneNumber>
<acc:phoneNumber>123456</acc:phoneNumber>
</acc:getAccountByPhoneNumber>
</soapenv:Body>
</soapenv:Envelope>
"""
And please don't think of using DOMParser etc, you will be able to do anything you need via Karate syntax.

Answer 2

Thanks to Peter for all help and the examples.
I feel this is the best way to achieve this.
Wrote a small javascript function
"""
* def replaceTag =
"""
function(x){
karate.setXml('temp', x.payload);
karate.pretty(karate.get('temp'));
if (x.field_tag) karate.set('temp', x.field_tag, x.field_value);
return karate.get('temp');
}
"""
and calling the same from Car.feature like below and I get the dynamically replaced payload.
Feature: Common
Scenario:
* print payload_file
* print field_tag
* print field_value
* xml payload = read('classpath:/payload/'+payload_file)
* print payload
* def args = { payload: #(payload), field_tag: #(field_tag), field_value: #
(field_value)}
* print args
* xml payload = call common.replaceTag args
Note: I had to upgrade Karate 0.7.0 version in order to use karate.setXml method.