def test_display_shows_insert_coins(self):
vendmachine = VendingMachine()
# add coins to vending machine so that it does not display the exact change only message
map(vendmachine.add_to_coin_bank, [self.dime, self.nickle])
current_balance = vendmachine.get_current_balance()
if current_balance < vendmachine.get_product_price("cola"):
self.assertEqual(vendmachine.check_display(), "INSERT COINS")
class TestVendingMachine(unittest.TestCase):
def setUp(self):
self.vendmachine = VendingMachine()
self.quarter = Coin(weight=5.670, diameter=24.26, thickness=1.75)
self.dime = Coin(weight=2.268, diameter=17.91, thickness=1.35)
self.nickle = Coin(weight=5.000, diameter=21.21, thickness=1.95)
self.penny = Coin(weight=2.500, diameter=19.05, thickness=1.52)
# stock the machine
for item in ["cola", "candy", "chips"]:
map(self.vendmachine.inventory[item].append, repeat(item, 20))
def test_product_price_is_int(self):
self.assertTrue(isinstance(self.vendmachine.get_product_price("chips"), int))
def test_product_to_dollar_string_price(self):
self.assertEqual(self.vendmachine.product_to_dollar_string_price("candy"), "$0.65")
self.assertEqual(self.vendmachine.product_to_dollar_string_price("cola"), "$1.00")
self.assertEqual(self.vendmachine.product_to_dollar_string_price("chips"), "$0.50")
def test_product_list_exists(self):
self.assertTrue(isinstance(self.vendmachine.get_product_list(), list))
def test_detect_coin_value(self):
self.assertEqual(self.vendmachine.detect_coin_value(self.quarter), 25)
self.assertEqual(self.vendmachine.detect_coin_value(self.dime), 10)
self.assertEqual(self.vendmachine.detect_coin_value(self.nickle), 5)
self.assertEqual(self.vendmachine.detect_coin_value(self.penny), None)
def test_current_balance_in_machine_is_zero_on_startup(self):
newmachine = VendingMachine()
self.assertEqual(newmachine.get_current_balance(), 0)
def test_inserted_coin_updates_current_balance(self):
current_balance = self.vendmachine.get_current_balance()
current_coin_return = self.vendmachine.check_coin_return()
# insert the nickle and check that it is not returned
self.vendmachine.insert_coin(self.nickle)
# check that the coin return has not changed
self.assertEqual(self.vendmachine.check_coin_return(), current_coin_return)
self.assertEqual(self.vendmachine.get_current_balance(), current_balance + 5)
def test_inserted_penny_is_returned(self):
vendmachine = VendingMachine()
current_balance = vendmachine.get_current_balance()
# penny should be returned when inserted
vendmachine.insert_coin(self.penny)
# check that the penny was placed in the coin return
self.assertEqual(vendmachine.check_coin_return(), [self.penny])
# current balance should not have changed
self.assertEqual(vendmachine.get_current_balance(), current_balance)
def test_empty_out_coins_from_machine(self):
coin_collection = self.vendmachine.take_out_coins()
self.assertTrue(isinstance(coin_collection, list))
updated_coin_collection = self.vendmachine.take_out_coins()
self.assertEqual(updated_coin_collection, [])
def test_inserted_coins_are_added_to_bank_after_purchase(self):
_ = self.vendmachine.take_out_coins()
# insert $0.50
my_coins = [self.quarter, self.quarter]
map(self.vendmachine.insert_coin, my_coins)
# no coins should be in bank before purchase
self.assertEqual(self.vendmachine.take_out_coins(), [])
# purchase chips
self.vendmachine.dispense_product("chips")
# coins should now be in the coin bank
self.assertEqual(self.vendmachine.take_out_coins(), my_coins)
def test_display_shows_insert_coins(self):
vendmachine = VendingMachine()
# add coins to vending machine so that it does not display the exact change only message
map(vendmachine.add_to_coin_bank, [self.dime, self.nickle])
current_balance = vendmachine.get_current_balance()
if current_balance < vendmachine.get_product_price("cola"):
self.assertEqual(vendmachine.check_display(), "INSERT COINS")
def test_dispense_product(self):
# add coins to vending machine so that it does not display the exact change only message
map(self.vendmachine.add_to_coin_bank, [self.dime, self.nickle])
for i in range(2):
my_product = self.vendmachine.dispense_product("chips")
self.assertEqual(my_product, None) # no coins inserted
self.assertEqual(self.vendmachine.check_display(), "PRICE $0.50")
self.assertEqual(self.vendmachine.check_display(), "INSERT COINS")
# insert quarters
value_inserted = 0
for i in range(2):
self.vendmachine.insert_coin(self.quarter)
value_inserted += 25
self.assertEqual(self.vendmachine.check_display(), "$0.{0}".format(value_inserted))
my_product = self.vendmachine.dispense_product("chips")
self.assertEqual(my_product, "chips")
self.assertEqual(self.vendmachine.check_display(), "THANK YOU")
self.assertEqual(self.vendmachine.current_balance, 0)
self.assertEqual(self.vendmachine.check_display(), "INSERT COINS")
def test_return_coins(self):
vendmachine = VendingMachine()
# check that the coin return is empty
self.assertEqual(vendmachine.check_coin_return(), [])
# insert coins
my_coins = [self.quarter, self.quarter, self.dime]
for coin in my_coins:
vendmachine.insert_coin(coin)
vendmachine.return_coins()
change = vendmachine.take_out_coins_from_coin_return()
self.assertEqual(self.count_change(my_coins), self.count_change(change))
# check that the coin return is empty again
self.assertEqual(vendmachine.check_coin_return(), [])
def count_change(self, change_list):
change_value = 0
for coin in change_list:
change_value += self.vendmachine.detect_coin_value(coin)
return change_value
def count_returned_change(self):
# count returned change
return self.count_change(self.vendmachine.take_out_coins_from_coin_return())
def test_make_change(self):
# make sure coin return is empty
if not len(self.vendmachine.check_coin_return()) == 0:
# take out all the coins
_ = self.vendmachine.take_out_coins_from_coin_return()
# insert $0.90
map(self.vendmachine.insert_coin, [self.quarter, self.quarter, self.quarter, self.dime, self.nickle])
# buy candy
self.vendmachine.dispense_product("candy")
# check coin return
self.assertEqual(25, self.count_returned_change())
# insert $0.75
map(self.vendmachine.insert_coin, repeat(self.quarter, 3))
# buy candy again
self.vendmachine.dispense_product("candy")
self.assertEqual(10, self.count_returned_change())
def test_exact_change_only(self):
# take out all the coins from the machine
_ = self.vendmachine.take_out_coins()
# test that the screen displays that the exact change is needed on each check of the display
for i in range(5):
self.assertEqual("EXACT CHANGE ONLY", self.vendmachine.check_display())
def test_sold_out(self):
# buy all the cola in the machine
while len(self.vendmachine.inventory["cola"]) > 0:
# insert $1.00
map(self.vendmachine.insert_coin, repeat(self.quarter, 4))
# buy cola
self.assertEqual("cola", self.vendmachine.dispense_product("cola"))
# insert $1.00
map(self.vendmachine.insert_coin, repeat(self.quarter, 4))
# try to buy cola
self.assertEqual(None, self.vendmachine.dispense_product("cola"))
# check that it displays that the item is sold out
self.assertEqual("SOLD OUT", self.vendmachine.check_display())