Tests for rst.el
The tests are using ERT. You need to install ERT for to run them. If you did you should change the path to the library contained in the variable ERT in Makefile.
To run the tests in Emacs use the facilities provided by ERT. Namely evaluate the buffer containing the tests and do:
M-x ert [RETURN] [RETURN]
To run the tests by make use
make ert-tests