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Python Django Basics Test Time Test our Writer model

Writer model test not sure what's wrong

I actually got this to pass and now it's not working....

articles/tests.py
from django.test import TestCase
from .models import Writer


class WriterModelTestCase(TestCase):
    '''Tests for the Writer model'''
    def test_case(self):
        self.writer = Writer.objects.create(
            name='Kelsey',
            email='kelsey@google.com',
            bio='wife')
        test = mailto(self.writer)
        self.assertIn('<' + self.email + '>', test)
articles/models.py
from django.db import models


class Article(models.Model):
    headline = models.CharField(max_length=255)
    publish_date = models.DateTimeField()
    content = models.TextField()
    writer = models.ForeignKey('Writer')

    def __str__(self):
        return self.headline


class Writer(models.Model):
    name = models.CharField(max_length=255)
    email = models.EmailField()
    bio = models.TextField()

    def __str__(self):
        return self.name

    def mailto(self):
        return '{} <{}>'.format(self.name, self.email)