test.py 오류

test.py 를 하면
raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
ValueError: The 'image' attribute has no file associated with it.

위와 같은 에러가 나옵니다.

*test.py 참고
from django.test import TestCase, Client
from bs4 import BeautifulSoup
from .models import Post, Category, Tag
from django.utils import timezone
from django.contrib.auth.models import User


def create_category(name='대외활동', description=''):
    category, is_created = Category.objects.get_or_create(
        name=name,
        description=description,
    )

    category.slug = category.name.replace('', '-').replace('/', '')
    category.save()

    return category


def create_tag(name='some tag'):
    tag, is_created = Tag.objects.get_or_create(
        name=name,
    )
    tag.slug = tag.name.replace('', '-').replace('/', '')
    tag.save()

    return tag


def create_post(title, organization, author, link, category=None):
    blog_post = Post.objects.create(
        category=category,
        title=title,
        organization=organization,
        birthline=timezone.now(),
        deadline=timezone.now(),
        link=link,
        author=author,
        created=timezone.now(),
        updated=timezone.now(),
    )

    return blog_post


class TestModel(TestCase):
    def setUp(self):
        self.client = Client()
        self.author_000 = User.objects.create(
            username='westline', password='nopassword')

    def test_category(self):
        category = create_category()

        post_000 = create_post(
            title='The first post',
            organization='SK',
            link='https://www.naver.com',
            author=self.author_000,
            category=category,
        )

        self.assertEqual(category.post_set.count(), 1)

    def test_tag(self):
        tag_000 = create_tag(name='bad_guy')
        tag_001 = create_tag(name='america')

        post_000 = create_post(
            title='The first post',
            organization='SK',
            link='https://www.naver.com',
            author=self.author_000,
        )

        post_000.tags.add(tag_000)
        post_000.tags.add(tag_001)
        post_000.save()

        post_001 = create_post(
            title='The second post',
            organization='Samsung',
            link='https://www.naver.com',
            author=self.author_000,
        )

        post_001.tags.add(tag_001)
        post_001.save()

        self.assertEqual(post_000.tags.count(), 2)  # post는 여러개의 tag를 가질 수 있다.
        # 하나의 tag는 여러개의 post에 붙을 수 있다
        self.assertEqual(tag_001.post_set.count(), 2)
        self.assertEqual(tag_001.post_set.first(), post_000)
        # 하나의 tag는 자신으 가진 post들을 불러올 수 있다.
        self.assertEqual(tag_001.post_set.last(), post_001)

    def test_post(self):
        category = create_category()
        post_000 = create_post(
            title='The first post',
            organization='SK',
            link='https://www.naver.com',
            author=self.author_000,
            category=category,
        )


class TestView(TestCase):
    def setUp(self):
        self.client = Client()
        self.author_000 = User.objects.create(
            username='westline', password='nopassword')

    def test_post_list_no_post(self):
        response = self.client.get('/blog/')
        self.assertEqual(response.status_code, 200)

        soup = BeautifulSoup(response.content, 'html.parser')
        title = soup.title

        self.assertIn(title.text, '대외활동의 모든 것')

        self.assertEqual(Post.objects.count(), 0)
        self.assertIn('아직 게시물이 없습니다.', soup.body.text)

    def test_post_list_with_post(self):
        post_000 = create_post(
            title='The first post',
            organization='SK',
            link='https://www.naver.com',
            author=self.author_000,
        )

        post_001 = create_post(
            title='The second post',
            organization='SAMSUNG',
            link='https://www.daum.net',
            author=self.author_000,
        )

        self.assertGreater(Post.objects.count(), 0)

        response = self.client.get('/blog/')
        self.assertEqual(response.status_code, 200)
        soup = BeautifulSoup(response.content, 'html.parser')
        body = soup.body
        self.assertNotIn('아직 게시물이 없습니다.', body.text)
        self.assertIn(post_000.title, body.text)
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