Make the test suite faster

[Fuco1]

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Using cask exec ert-runner --reporter ert+duration we can see how long each test runs. Some of the tests are extremly slow (3+ secs) which makes the test suite quite annoying to run interactively. We should aim to run the entire thing in under 5 seconds.

This is a task to keep track of related improvements, whether it be directly by improving performance or by tweaking the test suite to be faster.

I would invite everyone interested help out. This is a step one towards eventually migrating to buttercup wihch just makes everything much more pleasant.