def test_display()
        # seed the random number generator
        srand(15110)                            
        # create a canvas of size 300 X 300
        Canvas.init(300, 300, "Testing_Display")
        # initialize forest matrix randomly
        forest = Array.new(15)         # 15 rows
        for i in 0..14 do
            forest[i] = Array.new(15)  # create 15 columns for each row
            for j in 0..14 do
                forest[i][j] = rand(5) # pick a random tree state (0-4) 
                end
        end
	# display the forest using your display function
	display(forest)
end