def initialize_db(path):
"""Initialize the app wide currency db if not already initialized."""
ratesdb = RatesDB(str(path))
ratesdb.register_rate_provider(default_currency_rate_provider)
Currency.set_rates_db(ratesdb)
def set_ratedb_for_tests(async=False, slow_down_provider=False, provider=None):
log = []
# Returns a RatesDB that isn't async and that uses a fake provider
def fake_provider(currency, start_date, end_date):
log.append((start_date, end_date, currency))
number_of_days = (end_date - start_date).days + 1
return [(start_date + timedelta(i), 1.42 + (.01 * i)) for i in range(number_of_days)]
db = RatesDB(':memory:', async=async)
if provider is None:
provider = fake_provider
if slow_down_provider:
provider = slow_down(provider)
db.register_rate_provider(provider)
Currency.set_rates_db(db)
return db, log
def test_unknown_currency():
# Only known currencies are accepted.
with raises(ValueError):
Currency('FOO')
def test_async_and_repeat():
# If you make an ensure_rates() call and then the same call right after (before the first one
# is finished, the server will not be hit twice.
db, log = set_ratedb_for_tests(async=True, slow_down_provider=True)
db.ensure_rates(date(2008, 5, 20), ['USD'])
db.ensure_rates(date(2008, 5, 20), ['USD'])
jointhreads()
eq_(len(log), 1)