matrix is initially set: (a=1, b=0, c=0, d=1, tx=0, ty=0)
matrix3D is initially null: null
matrix3D is set: [object Matrix3D]
Setting matrix3D nulls matrix: null
Matrix3D#rawData returns clone: true
Matrix3D#rawData has initial values: 1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1
Assigning to rawData fields does nothing: 1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1
Assigning same Matrix3D instance to two DisplayObject's transforms throws:
ArgumentError: Error #2189: A Matrix3D can not be assigned to more than one DisplayObject.
Calling getRelativeMatrix3D with null target throws:
TypeError: Error #2007: Parameter relativeTo must be non-null.
Transform#getRelativeMatrix3D returns null if no Matrix3D is set: null
Transform#getRelativeMatrix3D returns Matrix3D if Matrix3D is set: [object Matrix3D]
