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django/tests/db_functions/math/test_cot.py
2022-02-07 20:37:05 +01:00

54 lines
2.2 KiB
Python

import math
from decimal import Decimal
from django.db.models import DecimalField
from django.db.models.functions import Cot
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import DecimalModel, FloatModel, IntegerModel
class CotTests(TestCase):
def test_null(self):
IntegerModel.objects.create()
obj = IntegerModel.objects.annotate(null_cot=Cot("normal")).first()
self.assertIsNone(obj.null_cot)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal("-12.9"), n2=Decimal("0.6"))
obj = DecimalModel.objects.annotate(n1_cot=Cot("n1"), n2_cot=Cot("n2")).first()
self.assertIsInstance(obj.n1_cot, Decimal)
self.assertIsInstance(obj.n2_cot, Decimal)
self.assertAlmostEqual(obj.n1_cot, Decimal(1 / math.tan(obj.n1)))
self.assertAlmostEqual(obj.n2_cot, Decimal(1 / math.tan(obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-27.5, f2=0.33)
obj = FloatModel.objects.annotate(f1_cot=Cot("f1"), f2_cot=Cot("f2")).first()
self.assertIsInstance(obj.f1_cot, float)
self.assertIsInstance(obj.f2_cot, float)
self.assertAlmostEqual(obj.f1_cot, 1 / math.tan(obj.f1))
self.assertAlmostEqual(obj.f2_cot, 1 / math.tan(obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=-5, normal=15, big=-1)
obj = IntegerModel.objects.annotate(
small_cot=Cot("small"),
normal_cot=Cot("normal"),
big_cot=Cot("big"),
).first()
self.assertIsInstance(obj.small_cot, float)
self.assertIsInstance(obj.normal_cot, float)
self.assertIsInstance(obj.big_cot, float)
self.assertAlmostEqual(obj.small_cot, 1 / math.tan(obj.small))
self.assertAlmostEqual(obj.normal_cot, 1 / math.tan(obj.normal))
self.assertAlmostEqual(obj.big_cot, 1 / math.tan(obj.big))
def test_transform(self):
with register_lookup(DecimalField, Cot):
DecimalModel.objects.create(n1=Decimal("12.0"), n2=Decimal("0"))
DecimalModel.objects.create(n1=Decimal("1.0"), n2=Decimal("0"))
obj = DecimalModel.objects.filter(n1__cot__gt=0).get()
self.assertEqual(obj.n1, Decimal("1.0"))