Test suite tweaks

Hi, thinks for the pull of the other one.  I did some tweaks to the test suite.

Currently I need to run
```
carton install
carton exec emacs --script test/ecukes-test
```
and I don't think I remember this when I do a PR next time :)
So, please make it easier to run the test.  (There can be another way to do this and I don't care if you do it in this way.)