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