add none query feature and test for the same

Author: rkisdp

django_async_orm/query.py

@@ -42,6 +42,9 @@ async def async_latest(self, *fields):
     async def async_first(self):
         return await sync_to_async(self.first, thread_sensitive=True)()
 
+    async def async_none(self):
+        return await sync_to_async(self.none, thread_sensitive=True)()
+
     async def async_last(self):
         return await sync_to_async(self.last, thread_sensitive=True)()
 

tests/test_django_async_orm.py

@@ -5,6 +5,7 @@
 from django.conf import settings
 from django.apps import apps
 from unittest import IsolatedAsyncioTestCase
+from django.db.models.query import EmptyQuerySet
 import time
 
 from .models import TestModel
@@ -135,6 +136,11 @@ async def test_async_count(self):
         result = await TestModel.objects.async_all()
         self.assertEqual(result.count(), 1)
 
+    @tag('ci')
+    async def test_async_none(self):
+        result = await TestModel.objects.none()
+        self.assertEqual(result, EmptyQuerySet)
+
     @tag('ci')
     async def test_async_aiter(self):
         all_qs = await TestModel.objects.async_all()