def test_upc_a2e2a(self, faker, num_samples):
from faker.providers.barcode import Provider
provider = Provider(faker)
for _ in range(num_samples):
upc_a = faker.upc_a(upc_ae_mode=True)
assert self.upc_a_pattern.fullmatch(upc_a)
# Convert UPC-A to UPC-E
upc_e = provider._convert_upc_a2e(upc_a)
# Number system and check digits must be the same
assert int(upc_a[0]) == int(upc_e[0])
assert int(upc_a[-1]) == int(upc_e[-1])
# Create a new UPC-A barcode based on the UPC-E barcode
new_upc_a = faker.upc_a(upc_ae_mode=True,
base=upc_e[1:-1],
number_system_digit=int(upc_e[0]))
# New UPC-A barcode must be the same as the original
assert upc_a == new_upc_a
def test_upc_a2e_bad_values(self):
from faker.providers.barcode import Provider
provider = Provider(self.fake)
# Invalid data type
with self.assertRaises(TypeError):
provider._convert_upc_a2e(12345678)
# Invalid string
with self.assertRaises(ValueError):
provider._convert_upc_a2e('abcdef')