is there a way that I can kick off expression rule testing for selected expression rules than kicking off testing for an entire application?
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What exactly are you looking to do / unable to do? When I go to "Manage Test Cases" for my application, I'm able to select certain expression rules and click "Run Selected".
My use case is that I'd like to invoke test cases for selected expression rules through a web API interface. Is that possible with the current features?
I don't know of any way of invoking the built-in Appian test cases other than through the Appian UI.