45 lines
1.7 KiB
Python
45 lines
1.7 KiB
Python
from decimal import Decimal
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from django.db.models.functions import Power
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from django.test import TestCase
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from ..models import DecimalModel, FloatModel, IntegerModel
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class PowerTests(TestCase):
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def test_null(self):
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IntegerModel.objects.create(big=100)
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obj = IntegerModel.objects.annotate(
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null_power_small=Power('small', 'normal'),
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null_power_normal=Power('normal', 'big'),
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).first()
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self.assertIsNone(obj.null_power_small)
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self.assertIsNone(obj.null_power_normal)
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def test_decimal(self):
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DecimalModel.objects.create(n1=Decimal('1.0'), n2=Decimal('-0.6'))
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obj = DecimalModel.objects.annotate(n_power=Power('n1', 'n2')).first()
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self.assertIsInstance(obj.n_power, Decimal)
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self.assertAlmostEqual(obj.n_power, Decimal(obj.n1 ** obj.n2))
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def test_float(self):
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FloatModel.objects.create(f1=2.3, f2=1.1)
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obj = FloatModel.objects.annotate(f_power=Power('f1', 'f2')).first()
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self.assertIsInstance(obj.f_power, float)
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self.assertAlmostEqual(obj.f_power, obj.f1 ** obj.f2)
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def test_integer(self):
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IntegerModel.objects.create(small=-1, normal=20, big=3)
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obj = IntegerModel.objects.annotate(
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small_power=Power('small', 'normal'),
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normal_power=Power('normal', 'big'),
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big_power=Power('big', 'small'),
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).first()
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self.assertIsInstance(obj.small_power, float)
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self.assertIsInstance(obj.normal_power, float)
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self.assertIsInstance(obj.big_power, float)
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self.assertAlmostEqual(obj.small_power, obj.small ** obj.normal)
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self.assertAlmostEqual(obj.normal_power, obj.normal ** obj.big)
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self.assertAlmostEqual(obj.big_power, obj.big ** obj.small)
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