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"""Tests for django.db.backends.utils"""
from decimal import Decimal, Rounded
from django.db.backends.utils import format_number, truncate_name
from django.test import SimpleTestCase
class TestUtils(SimpleTestCase):
def test_truncate_name(self):
self.assertEqual(truncate_name('some_table', 10), 'some_table')
self.assertEqual(truncate_name('some_long_table', 10), 'some_la38a')
self.assertEqual(truncate_name('some_long_table', 10, 3), 'some_loa38')
self.assertEqual(truncate_name('some_long_table'), 'some_long_table')
# "user"."table" syntax
self.assertEqual(truncate_name('username"."some_table', 10), 'username"."some_table')
self.assertEqual(truncate_name('username"."some_long_table', 10), 'username"."some_la38a')
self.assertEqual(truncate_name('username"."some_long_table', 10, 3), 'username"."some_loa38')
def test_format_number(self):
def equal(value, max_d, places, result):
self.assertEqual(format_number(Decimal(value), max_d, places), result)
equal('0', 12, 3, '0.000')
equal('0', 12, 8, '0.00000000')
equal('1', 12, 9, '1.000000000')
equal('0.00000000', 12, 8, '0.00000000')
equal('0.000000004', 12, 8, '0.00000000')
equal('0.000000008', 12, 8, '0.00000001')
equal('0.000000000000000000999', 10, 8, '0.00000000')
equal('0.1234567890', 12, 10, '0.1234567890')
equal('0.1234567890', 12, 9, '0.123456789')
equal('0.1234567890', 12, 8, '0.12345679')
equal('0.1234567890', 12, 5, '0.12346')
equal('0.1234567890', 12, 3, '0.123')
equal('0.1234567890', 12, 1, '0.1')
equal('0.1234567890', 12, 0, '0')
equal('0.1234567890', None, 0, '0')
equal('1234567890.1234567890', None, 0, '1234567890')
equal('1234567890.1234567890', None, 2, '1234567890.12')
equal('0.1234', 5, None, '0.1234')
equal('123.12', 5, None, '123.12')
with self.assertRaises(Rounded):
equal('0.1234567890', 5, None, '0.12346')
with self.assertRaises(Rounded):
equal('1234567890.1234', 5, None, '1234600000')
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