see inst/unitTests/shinyTest_01/tests/shinytest/test_01-expected/*.png
It is quite likely that this failure has been seen, reported, and maybe addressed by others.
Strategy:
search the web, and RStudio community, for similar reports
create a new, minimal, tiny shiny app which draws a plot. does shinytest exhibit the same failure?
keep me informed of your progress & problems at each step, at least daily
see
inst/unitTests/shinyTest_01/tests/shinytest/test_01-expected/*.png
It is quite likely that this failure has been seen, reported, and maybe addressed by others. Strategy:Here is 003.png: