diff --git a/tests/videodinges/models/test_transcoding.py b/tests/videodinges/models/test_transcoding.py
index 18d63c4..fed63fe 100644
--- a/tests/videodinges/models/test_transcoding.py
+++ b/tests/videodinges/models/test_transcoding.py
@@ -1,5 +1,10 @@
+from django.db.utils import IntegrityError
+
 from django.test import TestCase
-from videodinges.models import Transcoding, Video, qualities, transcoding_types
+
+from tests.videodinges import factories
+from videodinges.models import Transcoding, Video, qualities, transcoding_types, Upload
+
 
 class TranscodingTestCase(TestCase):
 	def setUp(self):
@@ -12,3 +17,45 @@ class TranscodingTestCase(TestCase):
 		self.assertEqual(transcoding.quality, '360p')
 		self.assertEqual(transcoding.type, 'video/webm')
 		self.assertEqual(transcoding.url, 'https://some_url')
+
+
+class CreateTranscodingTestCase(TestCase):
+
+	def test_upload_and_url_cannot_both_be_filled(self):
+		video = factories.create(Video)
+		with self.assertRaisesMessage(IntegrityError, 'CHECK constraint failed: upload_and_url_cannot_both_be_filled'):
+			Transcoding.objects.create(
+				video=video,
+				quality=qualities[0].name,
+				type=str(transcoding_types[0]),
+				url='https://some_url',
+				upload=factories.create(Upload)
+			)
+
+	def test_either_upload_or_url_must_be_filled(self):
+		video = factories.create(Video)
+
+		with self.assertRaisesMessage(IntegrityError, 'CHECK constraint failed: upload_or_url_is_filled'):
+			Transcoding.objects.create(
+				video=video,
+				quality=qualities[0].name,
+				type=str(transcoding_types[0]),
+			)
+
+	def test_no_duplicate_qualities_for_same_video_and_type_can_be_created(self):
+		video = factories.create(Video)
+
+		Transcoding.objects.create(
+			video=video,
+			quality=qualities[0].name,
+			type=str(transcoding_types[0]),
+			url='https://some_url',
+		)
+
+		with self.assertRaisesMessage(IntegrityError, 'UNIQUE constraint failed: transcodings.video_id, transcodings.quality, transcodings.type'):
+			Transcoding.objects.create(
+				video=video,
+				quality=qualities[0].name,
+				type=str(transcoding_types[0]),
+				url='https://some_url',
+			)