def test_max_retries_reached(self):
"""
Test that if there are n max collisions, the function raises RuntimeError.
"""
model = mock.Mock()
model.objects.filter().exists.side_effect = [True] * 10
with pytest.raises(RuntimeError):
generate_reference(model, lambda: 'something')
def generate_public_token(cls):
"""
:returns: a random unused public token of form
<50 uppercase/lowercase letters, digits and symbols>
:raises RuntimeError: if no public_token can be generated
"""
gen = partial(secrets.token_urlsafe, 37)
return generate_reference(model=cls, gen=gen, field='public_token')
def test_defaults(self):
"""
Test that it returns the value from its `gen` if the value
hasn't been used before.
"""
model = mock.Mock()
model.objects.filter().exists.return_value = False
reference = generate_reference(model, lambda: 'something')
assert reference == 'something'
def test_with_prefix(self):
"""
Test that if a prefix is specified, it will be used to generate the reference.
"""
model = mock.Mock()
model.objects.filter().exists.return_value = False
reference = generate_reference(model,
lambda: 'something',
prefix='pref/')
assert reference == 'pref/something'
def test_with_collision(self):
"""
Test that if gen returns a collision, the next available generated value
is used instead.
"""
model = mock.Mock()
model.objects.filter().exists.side_effect = [True, False]
gen = mock.Mock()
gen.side_effect = ['1st try', '2nd try']
reference = generate_reference(model, gen)
assert reference == '2nd try'
def generate_reference(cls):
"""
:returns: a random unused reference of form:
<(3) letters><(3) numbers>/<year> e.g. GEA962/16
:raises RuntimeError: if no reference can be generated
"""
def gen():
year_suffix = now().strftime('%y')
return '{letters}{numbers}/{year}'.format(
letters=get_random_string(length=3, allowed_chars='ACEFHJKMNPRTUVWXY'),
numbers=get_random_string(length=3, allowed_chars='123456789'),
year=year_suffix,
)
return generate_reference(model=cls, gen=gen)
def generate_quote_reference(order):
"""
:returns: a random unused reference of form:
<order.reference>/Q-<(2) lettes>/<(1) number> e.g. GEA962/16/Q-AB1
:raises RuntimeError: if no reference can be generated.
"""
from datahub.omis.quote.models import Quote
def gen():
return '{letters}{numbers}'.format(
letters=get_random_string(length=2,
allowed_chars='ACEFHJKMNPRTUVWXY'),
numbers=get_random_string(length=1, allowed_chars='123456789'),
)
return generate_reference(model=Quote,
gen=gen,
prefix=f'{order.reference}/Q-')
