Shell Running the tests in /usr/src/bin/sh/tests

I am playing around with the source code of /bin/sh and would like to execute the test-suite in /usr/src/bin/sh/test. I tried running
make test
in that location and it gives the following output:
root@thinkle:/usr/src/bin/sh/tests # make
===> builtins (all)
===> errors (all)
===> execution (all)
===> expansion (all)
===> invocation (all)
===> parameters (all)
===> parser (all)
===> set-e (all)
So there seems to be something going on there. However, after I deliberately modified a test so that it should break I still got the above output – nothing changed.

How do I execute these tests properly?