for postcode in range(1000):
test_db.add_postcode('de', postcode)
for postcode in range(32000, 33000):
test_db.add_postcode('us', postcode)
for postcode in range(1000):
test_db.add_postcode('de', postcode)
for postcode in range(32000, 33000):
test_db.add_postcode('us', postcode)