fix(unittests): set working directory in add_test call

Set the test property WORKING_DIRECTORY in which to execute the test.

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: I04e207a942efa2bd9fc69b1d3473ae9ac4e1de9f
1 file changed