Add some simple numQueries tests.

rest_framework/tests/generics.py

@@ -60,6 +60,7 @@ class TestRootView(TestCase):
         GET requests to ListCreateAPIView should return list of objects.
         """
         request = factory.get('/')
+        with self.assertNumQueries(1):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, self.data)
@@ -71,6 +72,7 @@ class TestRootView(TestCase):
         content = {'text': 'foobar'}
         request = factory.post('/', json.dumps(content),
                                content_type='application/json')
+        with self.assertNumQueries(1):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data, {'id': 4, 'text': 'foobar'})
@@ -84,6 +86,7 @@ class TestRootView(TestCase):
         content = {'text': 'foobar'}
         request = factory.put('/', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(0):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
         self.assertEqual(response.data, {"detail": "Method 'PUT' not allowed."})
@@ -93,6 +96,7 @@ class TestRootView(TestCase):
         DELETE requests to ListCreateAPIView should not be allowed
         """
         request = factory.delete('/')
+        with self.assertNumQueries(0):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
         self.assertEqual(response.data, {"detail": "Method 'DELETE' not allowed."})
@@ -102,6 +106,7 @@ class TestRootView(TestCase):
         OPTIONS requests to ListCreateAPIView should return metadata
         """
         request = factory.options('/')
+        with self.assertNumQueries(0):
             response = self.view(request).render()
         expected = {
             'parses': [
@@ -126,6 +131,7 @@ class TestRootView(TestCase):
         content = {'id': 999, 'text': 'foobar'}
         request = factory.post('/', json.dumps(content),
                                content_type='application/json')
+        with self.assertNumQueries(1):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data, {'id': 4, 'text': 'foobar'})
@@ -154,6 +160,7 @@ class TestInstanceView(TestCase):
         GET requests to RetrieveUpdateDestroyAPIView should return a single object.
         """
         request = factory.get('/1')
+        with self.assertNumQueries(1):
             response = self.view(request, pk=1).render()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, self.data[0])
@@ -165,6 +172,7 @@ class TestInstanceView(TestCase):
         content = {'text': 'foobar'}
         request = factory.post('/', json.dumps(content),
                                content_type='application/json')
+        with self.assertNumQueries(0):
             response = self.view(request).render()
         self.assertEqual(response.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
         self.assertEqual(response.data, {"detail": "Method 'POST' not allowed."})
@@ -176,6 +184,7 @@ class TestInstanceView(TestCase):
         content = {'text': 'foobar'}
         request = factory.put('/1', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(3):
             response = self.view(request, pk='1').render()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, {'id': 1, 'text': 'foobar'})
@@ -190,6 +199,7 @@ class TestInstanceView(TestCase):
         request = factory.patch('/1', json.dumps(content),
                               content_type='application/json')
 
+        with self.assertNumQueries(3):
             response = self.view(request, pk=1).render()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, {'id': 1, 'text': 'foobar'})
@@ -201,6 +211,7 @@ class TestInstanceView(TestCase):
         DELETE requests to RetrieveUpdateDestroyAPIView should delete an object.
         """
         request = factory.delete('/1')
+        with self.assertNumQueries(2):
             response = self.view(request, pk=1).render()
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
         self.assertEqual(response.content, six.b(''))
@@ -212,6 +223,7 @@ class TestInstanceView(TestCase):
         OPTIONS requests to RetrieveUpdateDestroyAPIView should return metadata
         """
         request = factory.options('/')
+        with self.assertNumQueries(0):
             response = self.view(request).render()
         expected = {
             'parses': [
@@ -236,6 +248,7 @@ class TestInstanceView(TestCase):
         content = {'id': 999, 'text': 'foobar'}
         request = factory.put('/1', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(3):
             response = self.view(request, pk=1).render()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, {'id': 1, 'text': 'foobar'})
@@ -251,6 +264,7 @@ class TestInstanceView(TestCase):
         content = {'text': 'foobar'}
         request = factory.put('/1', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(4):
             response = self.view(request, pk=1).render()
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data, {'id': 1, 'text': 'foobar'})
@@ -266,6 +280,7 @@ class TestInstanceView(TestCase):
         # pk fields can not be created on demand, only the database can set the pk for a new object
         request = factory.put('/5', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(4):
             response = self.view(request, pk=5).render()
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         new_obj = self.objects.get(pk=5)
@@ -279,6 +294,7 @@ class TestInstanceView(TestCase):
         content = {'text': 'foobar'}
         request = factory.put('/test_slug', json.dumps(content),
                               content_type='application/json')
+        with self.assertNumQueries(2):
             response = self.slug_based_view(request, slug='test_slug').render()
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data, {'slug': 'test_slug', 'text': 'foobar'})