def test_empty_minefield(self):
"""Test game methods with an empty minefield."""
game = Game(minefield=Minefield(x_size=4, y_size=5, mines=0),
first_success=False)
assert game.mf.bbbv == 1
# Zero mines, no flags.
assert game.get_flag_proportion() == 0
# Zero mines, one flag.
game.set_cell_flags((0, 0), 1)
assert game.get_flag_proportion() == math.inf
game.set_cell_flags((0, 0), 0)
game.select_cell((0, 0))
assert game.state is GameState.WON
assert game.get_elapsed() == 0
assert game.get_3bvps() == math.inf
assert game.get_flag_proportion() == 0