This commit adds a test for the outputs of the object info node.
This includes testing on meshes, and testing the random output on
lights, using area lights placed behind glass.
Tests were added for lights as they take a different code path.
And the glass was added so the lights will be visible to the camera in
the EEVEE render engine so this test can be reused when/if EEVEE gets
light nodes support.
Ref: blender/blender-test-data!54
0e4e67a464