'DEFAULT_PARSER_CLASSES': (
    'rest_framework.parsers.JSONParser',
    'rest_framework.parsers.MultiPartParser',
    'rest_framework.parsers.FileUploadParser',
),

file = serializers.FileField()

parser_classes = (FileUploadParser, JSONParser)

from rest_framework  import generics,status
from rest_framework.parsers import FormParser,MultiPartParser

class ProductCreateAPIView(generics.CreateAPIView):
    queryset = Product.objects.all()
    serializer_class = ProductCreateSerializer
    permission_classes = [IsAdminOrIsSelf,]
    parser_classes = (MultiPartParser,FormParser,)

    def perform_create(self,serializer,format=None):
        owner = self.request.user
        if self.request.data.get('image') is not None:
            product_image = self.request.data.get('image')
            serializer.save(owner=owner,product_image=product_image)
        else:
            serializer.save(owner=owner)

def test_product_creation_with_image(self):
       url = reverse('products_create_api')
       self.client.login(username='testaccount',password='testaccount')
        data = {
            "product_name" : "Potatoes",
            "product_description" : "Amazing Potatoes",
            "image" : open("local-filename.jpg","rb")
        }
        response = self.client.post(url,data)
        self.assertEqual(response.status_code,status.HTTP_201_CREATED)