1. import math

  2. from decimal import Decimal

  3. 

  4. from django.db.models import DecimalField

  5. from django.db.models.functions import ASin

  6. from django.test import TestCase

  7. from django.test.utils import register_lookup

  8. 

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

  10. 

  11. 

  12. class ASinTests(TestCase):

  13.     def test_null(self):

  14.         IntegerModel.objects.create()

  15.         obj = IntegerModel.objects.annotate(null_asin=ASin("normal")).first()

  16.         self.assertIsNone(obj.null_asin)

  17. 

  18.     def test_decimal(self):

  19.         DecimalModel.objects.create(n1=Decimal("0.9"), n2=Decimal("0.6"))

  20.         obj = DecimalModel.objects.annotate(

  21.             n1_asin=ASin("n1"), n2_asin=ASin("n2")

  22.         ).first()

  23.         self.assertIsInstance(obj.n1_asin, Decimal)

  24.         self.assertIsInstance(obj.n2_asin, Decimal)

  25.         self.assertAlmostEqual(obj.n1_asin, Decimal(math.asin(obj.n1)))

  26.         self.assertAlmostEqual(obj.n2_asin, Decimal(math.asin(obj.n2)))

  27. 

  28.     def test_float(self):

  29.         FloatModel.objects.create(f1=-0.5, f2=0.87)

  30.         obj = FloatModel.objects.annotate(

  31.             f1_asin=ASin("f1"), f2_asin=ASin("f2")

  32.         ).first()

  33.         self.assertIsInstance(obj.f1_asin, float)

  34.         self.assertIsInstance(obj.f2_asin, float)

  35.         self.assertAlmostEqual(obj.f1_asin, math.asin(obj.f1))

  36.         self.assertAlmostEqual(obj.f2_asin, math.asin(obj.f2))

  37. 

  38.     def test_integer(self):

  39.         IntegerModel.objects.create(small=0, normal=1, big=-1)

  40.         obj = IntegerModel.objects.annotate(

  41.             small_asin=ASin("small"),

  42.             normal_asin=ASin("normal"),

  43.             big_asin=ASin("big"),

  44.         ).first()

  45.         self.assertIsInstance(obj.small_asin, float)

  46.         self.assertIsInstance(obj.normal_asin, float)

  47.         self.assertIsInstance(obj.big_asin, float)

  48.         self.assertAlmostEqual(obj.small_asin, math.asin(obj.small))

  49.         self.assertAlmostEqual(obj.normal_asin, math.asin(obj.normal))

  50.         self.assertAlmostEqual(obj.big_asin, math.asin(obj.big))

  51. 

  52.     def test_transform(self):

  53.         with register_lookup(DecimalField, ASin):

  54.             DecimalModel.objects.create(n1=Decimal("0.1"), n2=Decimal("0"))

  55.             DecimalModel.objects.create(n1=Decimal("1.0"), n2=Decimal("0"))

  56.             obj = DecimalModel.objects.filter(n1__asin__gt=1).get()

  57.             self.assertEqual(obj.n1, Decimal("1.0"))
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