This is just getting a feel for how I'll go about testing these. The main
focus here won't be on the bindings themselves -- they're not really
interesting and I feel could change over time anyway as people's tastes
settle down. What I want to test here are the actions that get bound.
This is just an initial small set of what's going to be a much bigger
collection of Input action tests.
I'm going to be adding more tests for Input, and I don't want to be doing
one large monolithic file of them, so this makes a space where
Input-targeting tests can live together and be easy to spot.
