old_contents: from gruffy import SideBar
  
  g = SideBar()
  g.theme_pastel()
  g.theme_greyscale()
  
  g.data("test1", [1, 2, 3])
  g.data("test2", [3, 2, 1])
  g.write('gruffy_side_bar.png')
  
new_contents: from gruffy import SideBar
  
  g = SideBar()
  g.theme_pastel()
  g.theme_greyscale()
  
  g.data("test1", [1, 2, 3])
  g.data("test2", [3, 2, 1])
  g.write('gruffy_sidebar.png')
  
subject: update unit test