tests for this module

def TEST():
    """ tests for this module """
    grd = Grid(4,4, [2,4])
    grd.new_tile()
    grd.new_tile()
    print(grd)
    print("There are ", grd.count_blank_positions(), " blanks in grid 1\n")

    grd2 = Grid(5,5, ['A','B'])
    grd2.new_tile(26)
    print(grd2)
    build_board_checkers()

    print("There are ", grd2.count_blank_positions(), " blanks in grid 2")