Reach 100% test coverage about hyper

[Lukasa]

When we get there, we can force ourselves to stay there with the following command in .travis.yml (with thanks to @dstufft for helping me work this out):

py.test -n 4 --cov-report xml --cov hyper test/ && coverage report -m --fail-under 100

I suspect it'll work the same if we add these as multiple lines to the script: field.

[dstufft]

You can of course do it with less than 100% coverage, but you run into churn problems then. If you have 95% coverage, and you add some tests and get to 98%, then add some more stuff and drop back down to 96%, then you're still above 95% but it's not really doing what you want :(

[Lukasa]

Indeed. I want 100% coverage anyway, I just want to have a good way to avoid regressing it. =)

[Lukasa]

This is achieved as of 06d48dd! 🍺 Time to lock it down.

[Lukasa]

Enforced by 8c5bde9. I'll document this, but we don't need this issue anymore. =)