This is the only test which either doesn't call ```@cleanup``` or close figures manually after itself. I can't find another test which does this.

> Plus, if I was to submit a PR to tidy-up the testing I'd be sorely tempted to make it use unittest instead of nose.

Ouch. Cartopy's standing on the shoulders of giants here: matplotlib, numpy, and scipy all use nose tests. And frankly unittest encourages the use of ugly method names.