Its kind of a no-brainer that you might want to validate your assets in some way. Especially when you have multiple people working on the same project (not all of them developers). Furthermore its common to want to test the code that processes those assets, without having to hardcode versions of the assets in the tests, that might not match up with the live assets as they change through time. Finally of course, there is testing widgets that use the asset bundle, and need valid assets from it to behave properly.

#8490 seems to confirm that reading assets during test is not possible.