Karate framework retry until not working as expected

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The retry until expression has to be pure JavaScript and the special Karate match keywords such as contains are not supported, and you can’t do a “deep equals” like how you are trying, as that also is not possible in JS.

EDIT: in 0.9.6. onwards you can do a complex match in JS: https://stackoverflow.com/a/50350442/143475

Also note that JsonPath is not supported, which means * or .. cannot appear in the expression.

So if your response is { "tokens": [ "value1" ] }, you can do this:

And retry until response.tokens.includes('value1')

Or:

And retry until response.tokens[0] == 'value1'

To experiment, you can try expressions like this:

* def response = { "tokens": [ "value1" ] }
* assert response.tokens.includes('value1')

At run time, you can use JS to take care of conditions when the response is not yet ready while polling:

And retry until response.tokens && response.tokens.length

EDIT: actually a more elegant way to do the above is shown below, because karate.get() gracefully handles a JS or JsonPath evaluation failure and returns null:

And retry until karate.get('response.tokens.length')

Or if you are dealing with XML, you can use the karate.xmlPath() API:

And retry until karate.xmlPath(response, '//result') == 5

And if you really want to use the power of Karate’s match syntax, you can use the JS API:

And retry until karate.match(response, { tokens: '##[_ > 0]' }).pass

Note that if you have more complex logic, you can always wrap it into a re-usable function:

* def isValid = function(x){ return karate.match(x, { tokens: '##[_ > 0]' }).pass }
# ...
And retry until isValid(response)

Finally if none of the above works, you can always switch to a custom polling routine: polling.feature

EDIT: also see this answer for an example of how to use karate.filter() instead of JsonPath: https://stackoverflow.com/a/60537602/143475

EDIT: in version 0.9.6 onwards, Karate can do a match in JS, which can simplify some of the above: https://stackoverflow.com/a/50350442/143475

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