Building and running DMD tests

[Per Nordlöw]

Is it possible to compile and run unittest of dmd without 
druntime and phobos?

If so, how?

I'm trying the following under dmd root:

     make -C src -f posix.mak unittest
     ./generated/linux/release/64/dmd-unittest

but that doesn't compile my file of interest

test/compilable/traits.d

.

How can I make sure that all the files under /test/compilable 
compiles?