def test_track():
carts = [
day13.Cart(5, 0, 0, 0),
day13.Cart(3, 8, 0, 0),
day13.Cart(3, 1, 0, 0)
]
t = day13.Track(None, carts)
sorted_carts = t.order_carts()
assert len(sorted_carts) == 3
# Have all carts been sorted on smallest row, smalles col within row?
assert sorted_carts[0].row == 3 and sorted_carts[0].col == 1
assert sorted_carts[1].row == 3 and sorted_carts[1].col == 8
assert sorted_carts[2].row == 5 and sorted_carts[2].col == 0
def test_cart_moving_left_intersection():
# cart is moving to the left and encounters an intersection
# should turn left: down
c = day13.Cart(0, 0, 0, -1)
# turn left == up
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == 1
# second time is UNCHANGED
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == 1
# turn right == original == left
c.change_direction('+')
assert c.movecol == -1
assert c.moverow == 0
def test_cart_moving_down_intersection():
# cart is moving down and encounters an intersection
# should turn left: move right
c = day13.Cart(0, 0, 1, 0)
# turn left == up
c.change_direction('+')
assert c.movecol == 1
assert c.moverow == 0
# second time is UNCHANGED
c.change_direction('+')
assert c.movecol == 1
assert c.moverow == 0
# turn right == original == down
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == 1
def test_cart_moving_right_intersection():
# cart is moving to the right and encounters an intersection
# should turn left: up
c = day13.Cart(0, 0, 0, 1)
# turn left == up
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == -1
# second time is UNCHANGED
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == -1
# turn right == original == right
c.change_direction('+')
assert c.movecol == 1
assert c.moverow == 0
# fourth time is turn left = up again!
c.change_direction('+')
assert c.movecol == 0
assert c.moverow == -1
def test_cart_turn_move_down_slash():
# cart is moving down, should move left on slash
c = day13.Cart(0, 0, 1, 0)
c.change_direction('/')
assert c.movecol == -1
assert c.moverow == 0
def test_cart_turn_move_up_slash():
# cart is moving up, should move right on slash
c = day13.Cart(0, 0, -1, 0)
c.change_direction('/')
assert c.movecol == 1
assert c.moverow == 0
def test_cart_turn_move_right_slash():
# cart is moving to the right, should move up on slash
c = day13.Cart(0, 0, 0, 1)
c.change_direction('/')
assert c.movecol == 0
assert c.moverow == -1
def test_cart_turn_move_left_slash():
# cart is moving to the left, should move down on slash
c = day13.Cart(0, 0, 0, -1)
c.change_direction('/')
assert c.movecol == 0
assert c.moverow == 1
def test_cart_turn_move_right_backslash():
# cart is moving to the right, should move down on backslash
c = day13.Cart(0, 0, 0, 1)
c.change_direction('\\')
assert c.movecol == 0
assert c.moverow == 1
def test_cart_turn_move_down_backslash():
# cart is moving down, should move right on backslash
c = day13.Cart(0, 0, 1, 0)
c.change_direction('\\')
assert c.movecol == 1
assert c.moverow == 0
def test_cart_turn_move_up_backslash():
# cart is moving up, should move left on backslash
c = day13.Cart(0, 0, -1, 0)
c.change_direction('\\')
assert c.movecol == -1
assert c.moverow == 0
def test_cart_turn_move_left_backslash():
# cart is moving to the left, should move up on backslash
c = day13.Cart(0, 0, 0, -1)
c.change_direction('\\')
assert c.movecol == 0
assert c.moverow == -1
