Code coverage for a shiny app?

I have a package with an embedded shiny app (GitHub - jepusto/SingleCaseES: A calculator for single-case effect size indices) and have started to play with adding tests for the app using shinytest (which is pretty nifty). Is there any way to do the equivalent of code coverage assessment for the app ui and server? (Does it even make sense to ask this, considering how shiny code is evaluated reactively?)

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I wonder whether you might receive more answers by using the Shiny category?