IssueTracker

In the Shapes library, we have various tests for shape creation, but none for Morph.
We should add some that test the basics (morph at a certain progress value matches expectations, etc).
This would allow us to at least sanity-check that API changes are handled correctly. For example, I'm working on a CL to remove the progress property and put it in the draw calls instead, and it didn't cause a single test to fail, which seems like a blind spot we should fix.