1. from decimal import Decimal

  2. 

  3. from django.db.models.functions import Power

  4. from django.test import TestCase

  5. 

  6. from ..models import DecimalModel, FloatModel, IntegerModel

  7. 

  8. 

  9. class PowerTests(TestCase):

  10.     def test_null(self):

  11.         IntegerModel.objects.create(big=100)

  12.         obj = IntegerModel.objects.annotate(

  13.             null_power_small=Power("small", "normal"),

  14.             null_power_normal=Power("normal", "big"),

  15.             null_power_big=Power("big", "normal"),

  16.         ).first()

  17.         self.assertIsNone(obj.null_power_small)

  18.         self.assertIsNone(obj.null_power_normal)

  19.         self.assertIsNone(obj.null_power_big)

  20. 

  21.     def test_decimal(self):

  22.         DecimalModel.objects.create(n1=Decimal("1.0"), n2=Decimal("-0.6"))

  23.         obj = DecimalModel.objects.annotate(n_power=Power("n1", "n2")).first()

  24.         self.assertIsInstance(obj.n_power, Decimal)

  25.         self.assertAlmostEqual(obj.n_power, Decimal(obj.n1**obj.n2))

  26. 

  27.     def test_float(self):

  28.         FloatModel.objects.create(f1=2.3, f2=1.1)

  29.         obj = FloatModel.objects.annotate(f_power=Power("f1", "f2")).first()

  30.         self.assertIsInstance(obj.f_power, float)

  31.         self.assertAlmostEqual(obj.f_power, obj.f1**obj.f2)

  32. 

  33.     def test_integer(self):

  34.         IntegerModel.objects.create(small=-1, normal=20, big=3)

  35.         obj = IntegerModel.objects.annotate(

  36.             small_power=Power("small", "normal"),

  37.             normal_power=Power("normal", "big"),

  38.             big_power=Power("big", "small"),

  39.         ).first()

  40.         self.assertIsInstance(obj.small_power, float)

  41.         self.assertIsInstance(obj.normal_power, float)

  42.         self.assertIsInstance(obj.big_power, float)

  43.         self.assertAlmostEqual(obj.small_power, obj.small**obj.normal)

  44.         self.assertAlmostEqual(obj.normal_power, obj.normal**obj.big)

  45.         self.assertAlmostEqual(obj.big_power, obj.big**obj.small)
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