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