Shinytest example package

This is an example R package which uses shinytest to test two types of applications:

• An application which is in inst/sampleapp/app.R.
• An application which is created by a function, helloWorldApp(), instead of being in an app.R or ui.R/server.R.

For more information, see https://rstudio.github.io/shinytest/articles/package.html.