efl_ui_spec: add test suite for range_display events
Summary:
this test case ensures the correct emittation of the newly added events.
Reviewers: segfaultxavi, zmike, woohyun, cedric
Reviewed By: cedric
Subscribers: cedric, reviewers, committers
Tags: efl
Maniphest Tasks: T7895
Differential Revision: https://phab.enlightenment.org/D9373