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130 lines
5.5 KiB
Python
130 lines
5.5 KiB
Python
import unittest
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from decimal import Decimal
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from django.db import connection
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from django.db.models import DecimalField
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from django.db.models.functions import Pi, Round
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from django.test import TestCase
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from django.test.utils import register_lookup
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from ..models import DecimalModel, FloatModel, IntegerModel
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class RoundTests(TestCase):
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def test_null(self):
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IntegerModel.objects.create()
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obj = IntegerModel.objects.annotate(null_round=Round('normal')).first()
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self.assertIsNone(obj.null_round)
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def test_null_with_precision(self):
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IntegerModel.objects.create()
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obj = IntegerModel.objects.annotate(null_round=Round('normal', 5)).first()
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self.assertIsNone(obj.null_round)
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def test_null_with_negative_precision(self):
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IntegerModel.objects.create()
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obj = IntegerModel.objects.annotate(null_round=Round('normal', -1)).first()
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self.assertIsNone(obj.null_round)
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def test_decimal(self):
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DecimalModel.objects.create(n1=Decimal('-12.9'), n2=Decimal('0.6'))
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obj = DecimalModel.objects.annotate(n1_round=Round('n1'), n2_round=Round('n2')).first()
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self.assertIsInstance(obj.n1_round, Decimal)
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self.assertIsInstance(obj.n2_round, Decimal)
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self.assertAlmostEqual(obj.n1_round, obj.n1, places=0)
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self.assertAlmostEqual(obj.n2_round, obj.n2, places=0)
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def test_decimal_with_precision(self):
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DecimalModel.objects.create(n1=Decimal('-5.75'), n2=Pi())
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obj = DecimalModel.objects.annotate(
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n1_round=Round('n1', 1),
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n2_round=Round('n2', 5),
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).first()
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self.assertIsInstance(obj.n1_round, Decimal)
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self.assertIsInstance(obj.n2_round, Decimal)
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self.assertAlmostEqual(obj.n1_round, obj.n1, places=1)
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self.assertAlmostEqual(obj.n2_round, obj.n2, places=5)
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def test_decimal_with_negative_precision(self):
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DecimalModel.objects.create(n1=Decimal('365.25'))
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obj = DecimalModel.objects.annotate(n1_round=Round('n1', -1)).first()
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self.assertIsInstance(obj.n1_round, Decimal)
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self.assertEqual(obj.n1_round, 370)
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def test_float(self):
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FloatModel.objects.create(f1=-27.55, f2=0.55)
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obj = FloatModel.objects.annotate(f1_round=Round('f1'), f2_round=Round('f2')).first()
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self.assertIsInstance(obj.f1_round, float)
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self.assertIsInstance(obj.f2_round, float)
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self.assertAlmostEqual(obj.f1_round, obj.f1, places=0)
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self.assertAlmostEqual(obj.f2_round, obj.f2, places=0)
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def test_float_with_precision(self):
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FloatModel.objects.create(f1=-5.75, f2=Pi())
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obj = FloatModel.objects.annotate(
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f1_round=Round('f1', 1),
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f2_round=Round('f2', 5),
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).first()
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self.assertIsInstance(obj.f1_round, float)
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self.assertIsInstance(obj.f2_round, float)
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self.assertAlmostEqual(obj.f1_round, obj.f1, places=1)
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self.assertAlmostEqual(obj.f2_round, obj.f2, places=5)
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def test_float_with_negative_precision(self):
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FloatModel.objects.create(f1=365.25)
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obj = FloatModel.objects.annotate(f1_round=Round('f1', -1)).first()
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self.assertIsInstance(obj.f1_round, float)
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self.assertEqual(obj.f1_round, 370)
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def test_integer(self):
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IntegerModel.objects.create(small=-20, normal=15, big=-1)
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obj = IntegerModel.objects.annotate(
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small_round=Round('small'),
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normal_round=Round('normal'),
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big_round=Round('big'),
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).first()
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self.assertIsInstance(obj.small_round, int)
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self.assertIsInstance(obj.normal_round, int)
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self.assertIsInstance(obj.big_round, int)
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self.assertAlmostEqual(obj.small_round, obj.small, places=0)
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self.assertAlmostEqual(obj.normal_round, obj.normal, places=0)
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self.assertAlmostEqual(obj.big_round, obj.big, places=0)
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def test_integer_with_precision(self):
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IntegerModel.objects.create(small=-5, normal=3, big=-100)
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obj = IntegerModel.objects.annotate(
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small_round=Round('small', 1),
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normal_round=Round('normal', 5),
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big_round=Round('big', 2),
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).first()
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self.assertIsInstance(obj.small_round, int)
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self.assertIsInstance(obj.normal_round, int)
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self.assertIsInstance(obj.big_round, int)
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self.assertAlmostEqual(obj.small_round, obj.small, places=1)
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self.assertAlmostEqual(obj.normal_round, obj.normal, places=5)
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self.assertAlmostEqual(obj.big_round, obj.big, places=2)
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def test_integer_with_negative_precision(self):
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IntegerModel.objects.create(normal=365)
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obj = IntegerModel.objects.annotate(normal_round=Round('normal', -1)).first()
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self.assertIsInstance(obj.normal_round, int)
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self.assertEqual(obj.normal_round, 370)
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def test_transform(self):
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with register_lookup(DecimalField, Round):
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DecimalModel.objects.create(n1=Decimal('2.0'), n2=Decimal('0'))
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DecimalModel.objects.create(n1=Decimal('-1.0'), n2=Decimal('0'))
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obj = DecimalModel.objects.filter(n1__round__gt=0).get()
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self.assertEqual(obj.n1, Decimal('2.0'))
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@unittest.skipUnless(
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connection.vendor == 'sqlite',
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"SQLite doesn't support negative precision.",
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)
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def test_unsupported_negative_precision(self):
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FloatModel.objects.create(f1=123.45)
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msg = 'SQLite does not support negative precision.'
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with self.assertRaisesMessage(ValueError, msg):
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FloatModel.objects.annotate(value=Round('f1', -1)).first()
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