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This PR adds some unit tests for
Engine
. I intentionally omitted testingnext_animation
andprevious_animation
since those functions are slated to be removed fromEngine
in #36. Hopefully these tests aid in that refactor by solidifying some of the expected behavior ofEngine
.I should note that I also moved the responsibility of choosing the initial animation. Instead having the engine decide this, it now accepts an
initial_animation
. Not only did this make testing easier, but it is probably a better design when building an app with Xebow as well. This will let a developer choose the initial animation easier.