engine: Fix broken test in CommandBaseTest

Commit c54eba57ddc56c7bd7c6ff1d10360ac6dd145803 introduced the a change
which cause the CommandBaseTest to fail.

Change-Id: Idf63bf15ba6f7f1737213d8799ba8fe198190e1a
Signed-off-by: Moti Asayag <masayag@redhat.com>