Unit Testing main folder

[Bushfries]

Is there any way to unit test the 'main' folder?

So far I've been using the below command to start unit testing but it doesn't seem like EXTRA_COMPONENT_DIRS can be used to direct the build system to the main.
Command:
`make -j8 flash monitor EXTRA_COMPONENT_DIRS="~/path/to/project/components" TEST_COMPONENTS=testable`


Is there a way to do `EXTRA_COMPONENT_DIRS="~/path/to/project/main"` properly?