Building and running DMD tests

[Per Nordlöw via Digitalmars-d-learn]

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?