Introduce Google Truth in acceptance tests

"Truth is a testing framework designed to make your tests and their
error messages more readable and discoverable, while being extensible
to new types of objects."

http://google.github.io/truth/

Add dependency on Truth and convert some of the acceptance tests to
use it.

Change-Id: Ie80c08391f7b48e504db2a4bbe78cba7bbe85cef
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
7 files changed