You can extract the unit tests source code using the command:
./ltib -p imx-test -m prep
The source code will be extracted at <ltib folder>/rpm/BUILD/imx-test<version>
If you want to build and install, use:
./ltib -p imx-test -m scbuild
./ltib -p imx-test -m scdeploy
rgds
Rogerio