48 lines
1.8 KiB
Python
48 lines
1.8 KiB
Python
import math
|
|
from decimal import Decimal
|
|
|
|
from django.db.models.functions import Log
|
|
from django.test import TestCase
|
|
|
|
from ..models import DecimalModel, FloatModel, IntegerModel
|
|
|
|
|
|
class LogTests(TestCase):
|
|
|
|
def test_null(self):
|
|
IntegerModel.objects.create(big=100)
|
|
obj = IntegerModel.objects.annotate(
|
|
null_log_small=Log('small', 'normal'),
|
|
null_log_normal=Log('normal', 'big'),
|
|
null_log_big=Log('big', 'normal'),
|
|
).first()
|
|
self.assertIsNone(obj.null_log_small)
|
|
self.assertIsNone(obj.null_log_normal)
|
|
self.assertIsNone(obj.null_log_big)
|
|
|
|
def test_decimal(self):
|
|
DecimalModel.objects.create(n1=Decimal('12.9'), n2=Decimal('3.6'))
|
|
obj = DecimalModel.objects.annotate(n_log=Log('n1', 'n2')).first()
|
|
self.assertIsInstance(obj.n_log, Decimal)
|
|
self.assertAlmostEqual(obj.n_log, Decimal(math.log(obj.n2, obj.n1)))
|
|
|
|
def test_float(self):
|
|
FloatModel.objects.create(f1=2.0, f2=4.0)
|
|
obj = FloatModel.objects.annotate(f_log=Log('f1', 'f2')).first()
|
|
self.assertIsInstance(obj.f_log, float)
|
|
self.assertAlmostEqual(obj.f_log, math.log(obj.f2, obj.f1))
|
|
|
|
def test_integer(self):
|
|
IntegerModel.objects.create(small=4, normal=8, big=2)
|
|
obj = IntegerModel.objects.annotate(
|
|
small_log=Log('small', 'big'),
|
|
normal_log=Log('normal', 'big'),
|
|
big_log=Log('big', 'big'),
|
|
).first()
|
|
self.assertIsInstance(obj.small_log, float)
|
|
self.assertIsInstance(obj.normal_log, float)
|
|
self.assertIsInstance(obj.big_log, float)
|
|
self.assertAlmostEqual(obj.small_log, math.log(obj.big, obj.small))
|
|
self.assertAlmostEqual(obj.normal_log, math.log(obj.big, obj.normal))
|
|
self.assertAlmostEqual(obj.big_log, math.log(obj.big, obj.big))
|