unit tests for new Util functions, https://github.com/phetsims/scenery-phet/issues/384
unit tests for new Util functions, https://github.com/phetsims/scenery-phet/issues/384

Signed-off-by: Chris Malley <74b2712074b149d140079dbd7e875955d192e617@pixelzoom.com>

phetsims/dot,phetsims/dot,phetsims/dot