如何使用数据以及ImageField对djano-rest-framework api进行单元测试

Question

我有一个包含ImageField以及其他数据（整数，文本等）的模型。我有一个带有POST方法的API，可以使用图像文件创建数据。

问题是，如何测试包含imagefield的POST API。想要在测试文件而不是真实文件中创建伪造的图像，以及如何将其与其他数据一起进行测试。

serializer.py

class CategorySerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Category
        fields = ( 'id','name','description','parent_id','start','end')
        read_only_fields = ('id','name','description','parent_id','start','end',)

class ServiceProviderSerializer(serializers. HyperlinkedModelSerializer):
    category = CategorySerializer(many=True, read_only=True)   
    class Meta:        
        model = ServiceProvider        
        fields = (
            'id',
            'country_code',
            'city',
            'zip_code',
            'service_type',
            'preferred',
            'display_bann',
            'detail_name',
            'detail_address',
            'detail_description1',
            'detail_description2',
            'photo',
            'category',
        )   
        read_only_fields = ('id',)

    def create(self, validated_data):
        """
        Overriding the default create method of the Model serializer.
        """
        # category_data = validated_data.pop('category')
        category_data = self.context['request'].data.get('category')
        service_provider = ServiceProvider.objects.create(**validated_data)
        category_data = json.loads(category_data)
        for category in category_data:
            categoryObj = Category.objects.get(pk=category['id'])
            service_provider.category.add(categoryObj)
        return service_provider

test.py

def setUp(self):
    self.new_service_provider = {
            'country_code': "DE",
            'city': "FRANKFURT AM MAIN",
            'zip_code': 60435,
            'service_type': "Fitness Studio",
            'preferred': True,
            'display_bann': "?",
            'detail_name': "City Fitness Frankfurt",
            'detail_address': "Trakehner Str. 5, 60487 Frankfurt am Main",
            'detail_description1': "Based on review, we suggest you to go to this studio",
            'detail_description2': "",
            'category':[{'id':self.category1.pk}]
        }

def test_post_service_provider(self):
            self.client.credentials(HTTP_AUTHORIZATION='Token ' + self.adminUser.auth_token.key)
            # get API response
            response = self.client.post(
                reverse('service_provider-create'),
                data=self.new_service_provider,
                content_type='multipart/form-data'
            )
            print(response.data)
            self.assertEqual(response.status_code, status.HTTP_201_CREATED)

当前，由于我不知道如何模拟它，因此我尚未包括字段名称photo。