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46 lines
1.8 KiB
Python
46 lines
1.8 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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null_power_big=Power("big", "normal"),
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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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self.assertIsNone(obj.null_power_big)
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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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