Summary:
The new test verifies some common things about desktop switching
animation effects, it doesn't verify what each of one them is doing
because it wouldn't be worth it.
Test Plan:
dbus-run-session ctest -R testDesktopSwitchingAnimation
Reviewers: #kwin
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D18156
