import math
from decimal import Decimal
from django.db.models.functions import Mod
from django.test import TestCase
from ..models import DecimalModel, FloatModel, IntegerModel
class ModTests(TestCase):
def test_null(self):
IntegerModel.objects.create(big=100)
obj = IntegerModel.objects.annotate(
null_mod_small=Mod("small", "normal"),
null_mod_normal=Mod("normal", "big"),
).first()
self.assertIsNone(obj.null_mod_small)
self.assertIsNone(obj.null_mod_normal)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal("-9.9"), n2=Decimal("4.6"))
obj = DecimalModel.objects.annotate(n_mod=Mod("n1", "n2")).first()
self.assertIsInstance(obj.n_mod, Decimal)
self.assertAlmostEqual(obj.n_mod, Decimal(math.fmod(obj.n1, obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-25, f2=0.33)
obj = FloatModel.objects.annotate(f_mod=Mod("f1", "f2")).first()
self.assertIsInstance(obj.f_mod, float)
self.assertAlmostEqual(obj.f_mod, math.fmod(obj.f1, obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=20, normal=15, big=1)
obj = IntegerModel.objects.annotate(
small_mod=Mod("small", "normal"),
normal_mod=Mod("normal", "big"),
big_mod=Mod("big", "small"),
).first()
self.assertIsInstance(obj.small_mod, float)
self.assertIsInstance(obj.normal_mod, float)
self.assertIsInstance(obj.big_mod, float)
self.assertEqual(obj.small_mod, math.fmod(obj.small, obj.normal))
self.assertEqual(obj.normal_mod, math.fmod(obj.normal, obj.big))
self.assertEqual(obj.big_mod, math.fmod(obj.big, obj.small))