Test coverage?

[AmaranthineCodices]

Right now test coverage for Rust is kind of a mess, but it's possible to get it working on Linux, which we're building tests on. This thread has a tutorial on collecting test coverage; the first reply has a .travis.yml snippet for integrating kcov, travis, and coveralls.io. It might be nice to get some coverage metrics working early, so we can keep track of what needs to be tested and what's okay.

[LPGhatguy]

Good idea! Last time I tried this (for Rojo), I hit snags and ended up not continuing with it, but we should check it out again.