How to use the wagtailvideos.models.Video.objects.get function in wagtailvideos

def test_edit(self):
        response = self.post({
            'title': "Edited",
        })

        # Should redirect back to index
        self.assertRedirects(response, reverse('wagtailvideos:index'))

        # Check that the video was edited
        video = Video.objects.get(id=self.video.id)
        self.assertEqual(video.title, "Edited")
        self.assertEqual(self.video.file, video.file)

def test_add_too_long_filename(self):
        video_file = create_test_video_file()

        name = 'a_very_long_filename_' + ('x' * 100) + '.mp4'
        response = self.post({
            'title': "Test video",
            'file': SimpleUploadedFile(name, video_file.read(), "video/mp4"),
        })

        # Should be valid
        self.assertEqual(response.status_code, 302)
        video = Video.objects.get()

        self.assertEqual(len(video.file.name), Video._meta.get_field('file').max_length)

def test_edit_with_new_video_file(self):
        # Change the file size of the video
        self.video.file_size = 100000
        self.video.save()

        new_file = create_test_video_file()
        response = self.post({
            'title': "Edited",
            'file': SimpleUploadedFile('new.mp4', new_file.read(), "video/mp4"),
        })

        # Should redirect back to index
        self.assertRedirects(response, reverse('wagtailvideos:index'))

        # Check that the video file size changed (assume it changed to the correct value)
        video = Video.objects.get(id=self.video.id)
        self.assertNotEqual(video.file_size, 100000)