efl: improve test in checking the return value during Eina_Value get operation.
Summary: Depends on D10061
Reviewers: zmike, bu5hm4n, SanghyeonLee, segfaultxavi, felipealmeida, lauromoura
Reviewed By: bu5hm4n
Subscribers: reviewers, committers
Tags: efl
Differential Revision: https://phab.enlightenment.org/D10062