import math

from django.db.models.functions import Pi

from django.test import TestCase

from ..models import FloatModel

class PiTests(TestCase):

    def test(self):

        FloatModel.objects.create(f1=2.5, f2=15.9)

        obj = FloatModel.objects.annotate(pi=Pi()).first()

        self.assertIsInstance(obj.pi, float)

        self.assertAlmostEqual(obj.pi, math.pi, places=5)