This test performs animations of the left property on two boxes over 2 seconds. It takes 3 snapshots each and expects each result to be within a specified range.
PASS - box1 at 400 saw something close to: 20
PASS - box2 at 500 saw something close to: 20
PASS - box2 at 1000 saw something close to: 30
PASS - box1 at 1200 saw something close to: 10
PASS - box2 at 1500 saw something close to: 25
PASS - box1 at 1600 saw something close to: 15

