 is not properly being
// performed, this test would likely fail with a fallback to replace behavior.
test_composition({
  property: 'transform',
  underlying: 'rotateX(45deg)',
  accumulateFrom: 'rotateY(30deg)',
  accumulateTo: 'rotateY(70deg)',
}, [
  // Due to how rotation is accumulated (addition of underlying angles), the
  // behavior is identical to concatenating the components. The expectations
  // are expressed as concatenations for readability.
  {at: -0.5, expect: 'rotateX(45deg) rotateY(10deg)