from django.test import TestCase

from models import Person

class ChoicesTests(TestCase):

    def test_display(self):

        a = Person.objects.create(name='Adrian', gender='M')

        s = Person.objects.create(name='Sara', gender='F')

        self.assertEqual(a.gender, 'M')

        self.assertEqual(s.gender, 'F')

        self.assertEqual(a.get_gender_display(), 'Male')

        self.assertEqual(s.get_gender_display(), 'Female')

        # If the value for the field doesn't correspond to a valid choice,

        # the value itself is provided as a display value.

        a.gender = ''

        self.assertEqual(a.get_gender_display(), '')

        a.gender = 'U'

        self.assertEqual(a.get_gender_display(), 'U')