This introduces some behat tests to verify that
the display of enrolled courses in the navigation
block works as expected, both when a plain list
or a nested list is configured.
Personally I'm not happy with the way to select
expected text via css element. I'd love to see
something in an higher level like
I should see the text|link "xxxxx" in the "yyyy" "element"
with element being "block, header, footer, main...."
But that's another issue.
