I am using xcode 8.3.3, swift, and I am trying to get the tearDown method to run only once. 

I launch the application once with the solution provided here: 
[XCTestCase not launching application in setUp class method](https://stackoverflow.com/questions/45021466/xctestcase-not-launching-application-in-setup-class-method)

In the tearDown method, I want to logout of the application. I only want to do this once.

The XCTest documentation has a class tearDown() method, but when I try to use it - it doesn't have access to the application anymore?:
<https://developer.apple.com/documentation/xctest/xctestcase/understanding_setup_and_teardown_for_test_methods>

This is all I get when I am in the tearDown method and so it can't access any elements on the application anymore:

[![enter image description here](https://i.stack.imgur.com/poIa7.png)](https://i.stack.imgur.com/poIa7.png)

How can I run the code in the tearDown just once at the end of all tests?