Binary package “libtest-needsdisplay-perl” in ubuntu xenial

module to ensure that tests needing a display have one

 When testing GUI applications, sometimes applications or modules absolutely
 insist on a display, even just to load a module without actually showing any
 Regardless, this makes GUI applications pretty much impossible to build and
 test on headless or automated systems. And it fails to the point of not even
 running the Makefile.PL script because a dependency needs a display so it can
 be loaded to find a version.
 In these situations, what is needed is a fake display.
 The Test::NeedsDisplay module will search around and try to find a way to load
 some sort of display that can be used for the testing.