Change record status: 
Project: 
Introduced in branch: 
8.2.x
Description: 

The $modules property on BrowserTestBase and KernelTestBase is now protected.

Existing tests can be updated to change the visibility of this property from public to protected, however since PHP allows subclasses to increase visibility of properties, the change is optional.

Before:

public static $modules = ['my_module'];

After:

protected static $modules = ['my_module'];
Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done