Hi Dave.At the moment, there is no such assertion directly available. You can achieve this by combining an extractor and add a validator on the extracted data.
If you want to contribute a direct assertion, you can either go the route of publishing a plugin for yourself: https://jmeter.apache.org/usermanual/jmeter_tutorial.html (the tutorial probably needs some love itself)
If you want to have it in the core, you could look at the other assertions in the core code (look for the newer ones and those, that are already available as extractors and assertions). Try to build core for yourself (https://jmeter.apache.org/building.html). Discuss your plans on the dev mailing list and/or use a PR on github to get feedback on your implementation.
From my experience on fixing the existing validators/assertions, it helps to have a clear view, what you want to assert and writing down test cases before you implement something.
If you have further questions, head over to the dev mailing list. Hope we can get you to contribute it.
Felix Am 13.07.22 um 20:41 schrieb Dave Hreczany:
Hi Team, Where can I find the CSS Selector Assertion? If it's not available in JMeter, any pointers on how to contribute this new feature to JMeter? Much thanks, Dave
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