The basketball must follow the laws of gravity

[martprenger]

Commenly basketball is played on earth. Earth has gravity so this means that ball must fall to the ground.

// create a game
const game g;

// get coordinates of the ball
const old_coordinates = g.get_bal_coordinates();

// (assume the ball is in the air)
// go to next frame 
g.tick()
// get new coordinates of the ball
const new_coordinates = g.get_bal_coordinates();

// the coordinates should differ
assert (old_coordinates != new_coordinates);