Where is `testModule`?

In this introduction it is explained how to do testing for shiny modules:

https://shiny.rstudio.com/articles/integration-testing.html

There the function testModule is used which should be in the shiny package. I have updated my shiny package with remotes::install_github("rstudio/shiny") as explained in the article. Unfortunately, the function was not installed. Also when I check the Namespace file of shiny on github I cannot find testModule under the exported functions. But I found a merged pull request where testModule was added to the master branch. So why can't I find testModule? Did it move to another package or got deleted?

I ran into the same issue. I can only find the code for these functions on the specific pull requests, but not on any release of the shiny package. I filed an issue here.