class Test_Currency(BaseAppengineDatastoreTester):
""" Currency management tests """
def setUp(self):
super(Test_Currency, self).setUp()
self.entity_manager = CurrencyManager()
def test_create_currency(self):
""" Test adding a currency """
currency = helpers.create_dummy_currency(1)
self.verify_entity_instance(currency, CurrencyEntity)
def test_create_existing_currency(self):
""" Verify that adding a currency with an already existing symbol generates an exception """
currency = helpers.create_dummy_currency(1)
try:
currency = helpers.create_dummy_currency(1)
self.fail('Added a duplicated currency symbol')
except(CurrencyException):
pass
def test_add_exchange_rate_and_verify_conversion(self):
""" Add an exchange rate from currency 1 to currency 2 and verify conversion occurs """
currency1 = helpers.create_dummy_currency(1)
currency2 = helpers.create_dummy_currency(2)
self.entity_manager.add_exchange_rate(from_currency = currency1, to_currency = currency2, date = date.today(), rate = 1.2)
value1 = 10.0
value2 = self.entity_manager.convert_currency(from_currency = currency1, to_currency = currency2, date = date.today(), amount = value1)
self.assertEqual(value2, 12.0)
def test_exchange_rate_on_missing_day(self):
""" Verify that a conversion using the rate of a day not inserted in the database generates an exception """
currency1 = helpers.create_dummy_currency(1)
currency2 = helpers.create_dummy_currency(2)
value1 = 10.0
try:
self.entity_manager.convert_currency(from_currency = currency1, to_currency = currency2, date = date.today(), amount = value1)
self.fail('Conversion occurred!!')
except(CurrencyException):
pass
def test_exchange_rate_for_one_currency(self):
""" Verify that an exchange rate cannot be created if the from and to currency are the same """
currency1 = helpers.create_dummy_currency(1)
try:
self.entity_manager.add_exchange_rate(from_currency = currency1, to_currency = currency1, date = date.today(), rate = 1.2)
self.fail('Added a conversion rate from and to the same currency')
except(CurrencyException):
pass
def test_duplicated_exchange_rate(self):
""" Verify that a conversion rate cannot be added twice for the same day """
currency1 = helpers.create_dummy_currency(1)
currency2 = helpers.create_dummy_currency(2)
self.entity_manager.add_exchange_rate(from_currency = currency1, to_currency = currency2, date = date.today(), rate = 1.2)
try:
self.entity_manager.add_exchange_rate(from_currency = currency1, to_currency = currency2, date = date.today(), rate = 1.2)
self.fail('Added an already existing conversion rate ')
except(CurrencyException):
pass
def test_convert_as_list(self):
""" Retrieve all currencies and convert to format usable in a dropdown as a tuple of pairs (id, name) """
for index in range (0, 5):
helpers.create_dummy_currency(index)
currencies = self.entity_manager.list_currencies()
self.assertIsNotNone(currencies)
self.assertEqual(len(currencies), 5)
for currency in currencies:
self.assertIsNotNone(currency)
self.assertEqual(len(currency), 2)
